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| author | jaseg <git@jaseg.de> | 2023-12-30 16:38:02 +0100 |
|---|---|---|
| committer | jaseg <git@jaseg.de> | 2023-12-30 16:38:02 +0100 |
| commit | 458a5fdfc598517b9fbddd02d3e1ae7cc70ceb9d (patch) | |
| tree | 0ba3319ddb214bc65dd402de13939cb9ca283574 /blog/multichannel-led-driver | |
| parent | 9ee28abd5041ebbbc8acd39ddc84ca37e7255076 (diff) | |
| parent | 58d54c5debedca8c91b28026f520b226ac8682f6 (diff) | |
| download | blog-deploy.tar.gz blog-deploy.tar.bz2 blog-deploy.zip | |
deploy.py auto-commitdeploy
Diffstat (limited to 'blog/multichannel-led-driver')
20 files changed, 10649 insertions, 0 deletions
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+ <link rel="stylesheet" href="/style.css"> +</head> +<body><nav> + <div class="internal"> + + <a href="/" title="Home">Home</a> + <a href="/blog/" title="Blog">Blog</a> + <a href="/projects/" title="Projects">Projects</a> + <a href="/about/" title="About">About</a> + </div> + <div class="search"> + <div id="search"></div> + </div> + <div class="external"> + <a href="https://git.jaseg.de/" title="cgit">cgit</a> + <a href="https://github.com/jaseg" title="Github">Github</a> + <a href="https://gitlab.com/neinseg" title="Gitlab">Gitlab</a> + <a href="https://chaos.social/@jaseg" title="Mastodon">Mastodon</a> + </span> +</nav> + + <header> + <h1>32-Channel LED tape driver</h1> +<ul class="breadcrumbs"> + <li><a href="/">jaseg.de</a></li> + <li><a href="/blog/">Blog</a></li><li><a href="/blog/multichannel-led-driver/">32-Channel LED tape driver</a></li> +</ul> + <strong>2018-05-02</strong> + </header> + <main data-pagefind-body> + <div class="document"> + + +<div class="section" id="theoretical-basics"> +<h2>Theoretical basics</h2> +<p>Together, a friend and I outfitted the small staircase at Berlin's Chaos Computer Club with nice, shiny RGB-WW LED tape +for ambient lighting. This tape is like regular RGB tape but with an additional warm white channel, which makes for much +more natural pastels and whites. There are several variants of RGBW tape. Cheap ones have separate RGB and white LEDs, +which is fine for indirect lighting but does not work for direct lighting. Since we wanted to mount our tape in channels +at the front of the steps, we had to use the slightly more expensive variant with integrated RGBW LEDs. These are LEDs +in the 5050 (5.0mm by 5.0mm) form factor common with RGB LEDs that have a small section divided off for the white +channel. The red, green and blue LED chips sit together in the larger section covered with clear epoxy and the white +channel is made up from the usual blue LED inside a yellow phosphor in the smaller section.</p> +<p>Since we wanted to light up all of 15 steps, and for greatest visual effect we would have liked to be able to control +each step individually we had to find a way to control 60 channels of LED tape with a reasonable amount of hardware.</p> +<p>LED tape has integrated series resistors and runs off a fixed 12V or 24V constant-voltage supply. This means you don't +need a complex constant-current driver as you'd need with high-power LEDs. You can just hook up a section of LED tape +to a beefy MOSFET to control it. Traditionally, you would do <em>Pulse Width Modulation</em> (PWM) on the MOSFET's input to +control the LED tape's brightness.</p> +<div class="section" id="pulse-width-modulation"> +<h3>Pulse Width Modulation</h3> +<p><a class="reference external" href="https://en.wikipedia.org/wiki/Pulse-width_modulation">Pulse Width Modulation</a> is a technique of controlling the brightness of a load such as an LED with a digital signal. +The basic idea is that if you turn the LED on and off much too fast for anyone to notice, you can control its power by +changing how long you turn it on versus how long you leave it off.</p> +<p>PWM divides each second into a large number of periods. At the beginning of each period, you turn the LED on. After +that, you wait a certain time until you turn it off. Then, you wait for the next period to begin. The periods are always +the same length but you can set when you turn off the LED. If you turn it off right away, it's off almost all the time +and it looks like it's off to your eye. If you turn it off right at the end, it's on almost all the time and it looks +super bright to your eye. Now, if you turn it off halfway into the cycle, it's on half the time and it will look to your +eye as half as bright as before. This means that you can control the LED's brightness with only a digital signal and +good timing.</p> +<figure data-pagefind-ignore> + <img src="images/pwm_schema.jpg" alt="A visualization of PWM at different duty cycles."> + <figcaption>Waveforms of two PWM cycles at different duty cycles.</figcaption> +</figure><p>PWM works great if you have a dedicated PWM output on your microcontroller. It's extremely simple in both hardware and +software. Unfortunately for us, controlling 32 channels with PWM is not that easy. Cheap microcontrollers only have <a class="reference external" href="https://www.nxp.com/parametricSearch#/&c=c731_c380_c173_c161_c163&page=1">a +handful of hardware PWM outputs</a>, so we'd either have to do everything in software, bit-banging our LED modulation, or +we'd have to use a dedicated chip.</p> +<p>Doing PWM in software is both error-prone and slow. Since the maximum dynamic range of a PWM signal is limited by the +shortest duty cycle it can do, software PWM being slow means it has poor PWM resolution at maybe 8 bits at most. Poor +color resolution is not a problem if all you're doing is to fade around the <a class="reference external" href="https://en.wikipedia.org/wiki/HSL_and_HSV">HSV rainbow</a>, but for ambient lighting +where you <em>really</em> want to control the brightness down to a faint shimmer you need all the color resolution you can get.</p> +<p>If you rule out software PWM, what remains are dedicated <a class="reference external" href="http://www.ti.com/lit/ds/symlink/tlc5940.pdf">hardware PWM controllers</a>. Most of these have either of three +issues:</p> +<ul class="simple"> +<li>They're expensive</li> +<li>They don't have generous PWM resolution either (12 bits if you're lucky)</li> +<li>They're meant to drive small LEDs such as a 7-segment display directly and you can't just hook up a MOSFET to their +output</li> +</ul> +<p>This means we're stuck in a dilemma between two poor solutions if we'd want to do PWM. Luckily for us, PWM is not the +only modulation in town.</p> +</div> +<div class="section" id="binary-code-modulation"> +<h3>Binary Code Modulation</h3> +<p>PWM is the bread-and-butter of the maker crowd. Everyone and their cat is doing it and it works really well most of the +time. Unbeknownst to most of the maker crowd, there is however another popular modulation method that's mostly used in +professional LED systems: Enter <a class="reference external" href="http://www.batsocks.co.uk/readme/art_bcm_1.htm">*Binary Code Modulation* (BCM)</a>.</p> +<p>BCM is to PWM sort of what barcodes are to handwriting. While PWM is easy to understand and simple to implement if all +you have is a counter and an IO pin, BCM is more complicated. On the other hand, computers can do complicated and BCM +really shines in multi-channel applications.</p> +<p>Similar to PWM, BCM works by turning on and off the LED in short periods fast enough to make your eye perceive it as +partially on all the time. In PWM the channel's brightness is linearly dependent on its duty cycle, i.e. the percentage +it is turned on. In PWM the duty cycle D is the total period T divided by the on period T_on. The issue with doing PWM +on many channels at once is that you have to turn off each channel at the exact time to match its duty cycle. +Controlling many IO pins at once with precise timing is really hard to do in software.</p> +<p>BCM avoids this by further dividing each period into smaller periods which we'll call <em>bit periods</em> and splitting each +channel's duty cycle into chunks the size of these bit periods. The amazingly elegant thing in BCM now is that as you +can guess from the name these bit periods are weighted in powers of two. Say the shortest bit period lasts 1 +microsecond. Then the second-shortest bit period is 2 microseconds and the third is 4, the fifth 8, the sixth 16 and so +on.</p> +<figure data-pagefind-ignore> + <img src="images/bcm_schema.jpg" alt="A visualization of BCM at different duty cycles."> + <figcaption>Waveforms of a single 4-bit BCM cycle at different duty cycles. This BCM can produce 16 different + levels.</figcaption> +</figure><p>Staggered like this, you turn on the LED for integer value of microseconds by turning it on in the bit periods +corresponding to the binary bits of that value. If I want my LED to light for 19 microseconds every period, I turn it on +in the 16 microsecond bit period, the 2 microsecond bit period and the 1 microsecond bit period and leave it off for the +4 and 8 mircosecond bit periods.</p> +<p>Now, how this is better instead of just more complicated than plain old PWM might not be clear yet. But consider this: +Turning on and off a large number of channels, each at its own arbitrary time is hard because doing the timing in +software is hard. We can't use hardware timers since we only have two or three of those, and we have 32 channels. +However, we can use one hardware timer to trigger a really cheap external latch to turn on or off the 32 channels all at +once. With this setup, we can only controll all channels at once, but we can do so with very precise timing.</p> +<p>All we need to do is to set our timer to the durations of the BCM bit periods, and we can get the same result as we'd +get with PWM with only one hardware timer and a bit of code that is not timing-critical anymore.</p> +<div class="section" id="applications-of-binary-code-modulation"> +<h4>Applications of Binary Code Modulation</h4> +<p>BCM is a truly wondrous technique, and outside of hobbyist circles it is in fact very widely known. Though we're using +it to control just 32 channels here, you can do much more channels without any problems. The most common application +where BCM is invariably used is <em>any</em> kind of LED screen. Controlling the thousands and thousands of LEDs in an LED +screen with PWM with a dedicated timer for each LED would not be feasible. With BCM, all you need to dedicate to a +single LED is a flipflop (or part of one if you're multiplexing). In fact, there is a whole range of <a class="reference external" href="http://www.vabolis.lt/stuff/MBI5026.pdf">ICs with no other +purpose than to enable BCM on large LED matrices</a>. Basically, these are a +high-speed shift register with latched outputs much like the venerable <a class="reference external" href="http://www.ti.com/lit/ds/symlink/sn74hc595.pdf">74HC595</a>, only their outputs are constant-current +sinks made so that you can directly connect an LED to them.</p> +</div> +<div class="section" id="running-bcm-on-led-tape"> +<h4>Running BCM on LED tape</h4> +<p>In our case, we don't need any special driver chips to control our LED tape. We just connect the outputs of a <a class="reference external" href="http://www.ti.com/lit/ds/symlink/sn74hc595.pdf">74HC595</a> +shift register to one <a class="reference external" href="https://en.wikipedia.org/wiki/MOSFET">MOSFET</a> each, and then we directly connect the LED tape to these MOSFETs. The MOSFETs allow us to +drive a couple of amps into the LED tape from the weak outputs of the shift register.</p> +<p>The BCM timing is done by hooking up two timer channels of our microcontroller to the shift registers <em>strobe</em> and +<em>reset</em> inputs. We set the timer to PWM mode so we can generate pulses with precise timing. At the beginning of each +bit period, a pulse will strobe the data for this bit period that we shifted in previously. At the end of the bit +period, one pulse will reset the shift register and one will strobe the freshly-reset zeros into the outputs.</p> +<figure data-pagefind-ignore> + <img src="images/olsndot_output_schematic.jpg" alt="From left to right, we see the STM32, one of the shift + registers, and the LEDs and MOSFETs. The LED tape is driven to ground by the MOSFETs, which are in turn directly + driven from the shift register outputs. The shift register is wired up to the STM32 with its clock and data + inputs on SCK and MOSI and its RESET and STROBE inputs on channel 2 and 3 of timer 1."> + <figcaption> + The schematic of a single output of this LED driver. Multiple shift register stages can be cascaded. + </figcaption> +</figure><p>Our implementation of this system runs on an <a class="reference external" href="http://www.st.com/resource/en/datasheet/stm32f030f4.pdf">STM32F030F4P6</a>, the smallest, cheapest ARM microcontroller you can get from +ST. This microcontroller has only 16kB of flash and 1kB of RAM, but that's plenty for our use. We use its SPI controller +to feed the modulation data to the shift registers really fast, and we use two timer channels to control the shift +registers' reset and strobe.</p> +<p>We can easily cascade shift registers without any ill side-effects, and even hundreds of channels should be no problem +for this setup. The only reason we chose to stick to a 32-channel board is the mechanics of it. We thought it would be +easier to have several small boards instead of having one huge board with loads of connectors and cables coming off it.</p> +<p>The BOM cost per channel for our system is 3ct for a reasonable MOSFET, about 1ct for one eighth of a shift register +plus less than a cent for one resistor between shift register and MOSFET. In the end, the connectors are more expensive +than the driving circuitry.</p> +</div> +</div> +</div> +<div class="section" id="hardware-design"> +<h2>Hardware design</h2> +<p>From this starting point, we made a very prototype-y hardware design for a 32-channel 12V LED tape driver. The design is +based on the <a class="reference external" href="http://www.st.com/resource/en/datasheet/stm32f030f4.pdf">STM32F030F4P6</a> driving the shift registers as explained above. The system is controlled through an <a class="reference external" href="https://en.wikipedia.org/wiki/RS-485">RS485</a> +bus that is connected up to the microcontroller's UART using an <a class="reference external" href="https://datasheets.maximintegrated.com/en/ds/MAX1487-MAX491.pdf">MAX485</a>-compatible RS485 transceiver. The LED tape is +connected using 9-pin <a class="reference external" href="https://en.wikipedia.org/wiki/D-subminiature">SUB-D</a> connectors since they are cheap and good enough for the small current of our short segments +of LED tape. The MOSFETs we use are small <a class="reference external" href="http://www.nxp.com/documents/outline_drawing/SOT23.pdf">SOT-23</a> logic-level MOSFETs. In various prototypes we used both International +Rectifier's <a class="reference external" href="https://www.infineon.com/dgdl/?fileId=5546d462533600a4015356686fed261f">IRLML6244</a> as well as Alpha & Omega Semiconductor's <a class="reference external" href="http://aosmd.com/pdfs/datasheet/AO3400.pdf">AO3400</a>. Both are good up to about 30V/5A. Since we're +only driving about 2m of LED tape per channel we're not going above about 0.5A and the MOSFETs don't even get warm.</p> +<div class="section" id="switching-nonlinearities"> +<h3>Switching nonlinearities</h3> +<p>During testing of our initial prototype, we noticed that the brightness seemed to jump around when fading to very low +values. It turned out that our extremely simple LED driving circuit consisting of only the shift register directly +driving a MOSFET, which in turn directly drives the LED tape was maybe a little bit too simple. After some measurements +it turned out that we were looking at about 6Vpp of ringing on the driver's output voltage. The picture below is the +voltrage we saw on our oscilloscope on the LED tape.</p> +<figure data-pagefind-ignore> + <img src="images/driver_ringing_strong.jpg" alt="Strong ringing on the LED voltage waveform edge at about + 100% overshoot during about 70% of the cycle time."> + <figcaption>Bad ringing on the LED output voltage caused by wiring inductance. Note that the effect on the + actual LED current is less bad than this looks since the LED's V/I curve is nonlinear.</figcaption> +</figure><div class="section" id="dynamic-switching-behavior-cause-and-effect"> +<h4>Dynamic switching behavior: Cause and Effect</h4> +<p>A bit of <a class="reference external" href="http://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html">LTSpice</a> action later we found that the inductance of the few metres of cable leading to the LED tape is the +likely culprit. The figure below is the schematic used for the simulations.</p> +<figure data-pagefind-ignore> + <img src="images/driver_output_ltspice_schematic.jpg" alt="The LTSpice schematic of one output of the driver, + taking into account the shift register's output ESR and the wiring ESL."> + <figcaption>The schematic of the simulation in LTSpice</figcaption> +</figure><p>As tested, the driver does not include any per-output smoothing so the ~.5A transient on each BCM cycle hits the cable +in full. Combined with the cable inductance, this works out to a considerable lag of the rising edge of the LED +current, and bad ringing on its falling edge. Below is the voltage on the LED output from an LTSpice simulation of our +driver.</p> +<figure data-pagefind-ignore> + <img src="images/overshoot_sim_r0.svg" alt="The result of the LTSpice simulation of our driver output. The LED + current shows similar ringing to what we measured using the oscilloscope. Interestingly, the gate voltage shows + strong ringing, too."> + <figcaption>The result of our LTSpice simulation. This simulation assumes 1µH of wiring inductance and 50Ω of + output impedance on the part of the shift register. The ringing at the gate visible in the gate voltage graph is + due to feed-through of the ringing at the output through the MOSFET's parasitic Cgd.</figcaption> +</figure><p>We were able to reduce the rining and limit the effect somewhat by putting a 220Ω series resistor in between the shift +register output and the MOSFET gate. This resistor forms an RC circuit with the MOSFET's nanofarad or two of gate +capacitance. The result of this is that the LED current passing the wire's ESL rises slightly more slowly and thus the +series inductance gets excited slightly less, and the overshoot decreases. Below is a picture of the waveform with the +damping resistor in place and a picture of our measurement for comparison. The resistor values don't agree perfectly +since the estimated ESL and stray capacitance of the wiring is probably way off.</p> +<figure data-pagefind-ignore> + <img src="images/driver_ringing_weak.jpg" alt="Weak ringing on the LED voltage waveform edge at about 30% + overshoot during about 20% of the cycle time."> + <figcaption>Adding a resistor in front of the MOSFET gate to slow the transition damped the ringing somewhat, + but ultimately it cannot be eliminated entirely. Note how you can actually see the miller plateau on the + trailing edge of this signal. + </figcaption> +</figure><figure data-pagefind-ignore> + <img src="images/overshoot_sim_r100.svg" alt="The result of the LTSpice simulation of our driver output with an + extra 100 Ohms between shift register output and MOSFET gate. Similar to the oscilloscope measurement the + ringing is much reduced in its amplitude."> + <figcaption>The LTSpice simulation result with the same parameters as above but with an extra 100Ω between the + shfit register's output and the MOSFET's gate.</figcaption> +</figure><p>A side effect of this fix is that now the effective on-time of the LED tape is much longer than the duty cycle at the +shift register's output at very small duty cycles (1µs or less). This is caused by the MOSFET's <a class="reference external" href="https://www.vishay.com/docs/68214/turnonprocess.pdf">miller +plateau</a>. For illustration, below is a graph of both the excitation waveform (the boxy line) and the resulting LED +current (the other ones) both without damping (top) and with 220Ω damping (bottom). As you can see the effective duty +cycle of the LED current is not at all equal to the 50% duty cycle of the excitation square wave.</p> +<figure data-pagefind-ignore> + <img src="images/asymmetric_iled.svg" alt="The result of an LTSpice simulation of the LED duty cycle without and + with damping. Dampening widens the LED current waveform from 50% duty cycle with sharp edges to about 80% duty + cycle with soft edges."> + <figcaption>Simulated LED duty cycle with and without damping. The damping resistance used in this simulation + was 220Ω.</figcaption> +</figure><figure data-pagefind-ignore> + <img src="images/asymmetric_vgate.svg" alt="The gate voltages in the spice simulation above. The undamped + response shows sharp edges with the miller plateau being a barely noticeable step, but with strong ringing on + the trailing edge. The damped response shows RC-like slow-edges, but has wide miller plateaus on both edges + adding up to about 50% of the pulse width."> + <figcaption>The MOSFET gate voltage from the simulation in the figure above. You can clearly see how the miller + plateau (the horizontal part of the trace at about 1V) is getting much wider with added damped, and how the + resulting gate charge/discharge curve is not at all that of a capacitor anymore.</figcaption> +</figure><p>In conclusion, we have three major causes for our calculated LED brightness not matching reality:</p> +<ul class="simple"> +<li>Ringing of the equivalent series inductance of the wiring leading up to the LED tape</li> +<li>Miller plateau lag</li> +<li>The damping resistor and the MOSFET gate forming an RC filter that helps with wire ESL ringing but worsens the miller +plateau issue and deforms the LED current edges.</li> +</ul> +<p>Added up, these three effects yield a picture that agrees well with our simulations and measurements. The overall effect +is neglegible at long period durations (>10µs), but gets really bad at short period durations (<1µs). The effect is +non-linear, so correcting for it is not as simple as adding an offset.</p> +</div> +<div class="section" id="measuring-led-tape-brightness"> +<h4>Measuring LED tape brightness</h4> +<p>In order to correct for the nonlinearities mentioned above, we decided to implement a lookup table mapping BCM period to +actual timer setting. That is, each row of the table contains the actual period length we need to set the +microcontroller's timer to in order to get our intended brightness steps.</p> +<p>To calibrate our driver, we needed a setup for reproducible measurement of the relative brightness of our LED tape at +different settings. Absolute brightness is not of interest to us as the eye can't perceive it. To perform the +calibration, the LED driver is set to enable each single BCM period in turn, i.e. brightness values 1, 2, 4, 8, 16 etc.</p> +<p>The setup we used to measure the LED tape's brightness consists of a bunch of LED tape stuck into a tin can for +shielding against both stray light and electromagnetic interference and a photodiode looking at the LED tape. We used +the venerable <a class="reference external" href="http://www.vishay.com/docs/81521/bpw34.pdf">BPW34</a> photodiode in our setup as I had a bunch leftover from another project and because they are quite +sensitive owing to their physically large die area.</p> +<figure data-pagefind-ignore> + <img src="images/linearization_setup.jpg" alt="The led measurement setup consists of several PCBs and a + breadboard linked with a bunch of wires and a big tin can to shield the LEDs and the photodiode. A large sub-D + connector is put into the top of the tin can as a feed-through for the LED tape's control signals and the + photodiode signal. In the background the control laptop is visible."> + <figcaption>The LED brighness measurement setup. The big tin can contains a bunch of LED tape and the + photodiode. The breadboard on the right is used for the photodiode preamplifier and for jumpering around the LED + tape's channels. The red board next to it is the buspirate used as ADC. The board on the bottom left is a + TTL-to-RS485 converter and the board in the middle is the unit under test.</figcaption> +</figure><p>The photodiode's photocurrent is converted into a voltage using a very simple transimpedance amplifier based around a +<a class="reference external" href="http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdf">MCP6002</a> opamp that was damped into oblivion with a couple nanofarads of capacitance in its feedback loop. The <a class="reference external" href="http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdf">MCP6002</a> +is a fine choice here since I had a bunch and because it is a CMOS opamp, meaning it has low bias current that would +mess up our measurements. For many applications, opamp bias current is not a big issue but when using the opamp to +directly measure very small currents at its input it quickly swamps out the signal for most BJT-input types.</p> +<p>The transimpedance amplifier's output is read from the computer using the ADC input of a buspirate USB thinggamajob. In +general I would not recommend the buspirate as a tool for this job since it's ADC is not particularly good and it's +programming interface is positively atrocious, but it was what I had and it beat first wiring up one of the dedicated +ADC chips I had in my parts bin.</p> +<p>The computer runs a small python script cycling the LED tape through all its BCM period settings and taking a brightness +measurement at each step. Later on, these measurements can be plotted to visualize the resulting slope's linearity, and +we can even do a simulation of the resulting brightness for all possible control values by just adding the measured +photocurrents for a certain BCM setpoint just as our retinas would do.</p> +<figure data-pagefind-ignore> + <img src="images/driver_linearity_raw.svg" alt=""> + <figcaption> + A plot of the measured brightness of our LED tape for each BCM period. The brightness values are normalized + to the value measured at the LSB setpoint (brightness=1/65535). Ideally, this plot would show a straight + line with slope 1. Obviously, it doesn't. The bend in the curve is caused by the above-mentioned duty cycle + offset adding an offset to all brightness values. Shown is both the raw data (light), which has essentially zero + measurement error and a linear fit (dark). + + The plot is in log-log to approximate how the human eye would perceive brightness, i.e. highly sensitive at + low values but not very sensitive at all at large values. + </figcaption> +</figure><p>While it would be possible to fully automate the optimization of BCM driver lookup tables, we needed only one and in the +end I just sat down and manually tweaked the ideal values we initially calculated until I liked the result. You can see +the resulting brightness curve below.</p> +<div class="subfigure" data-pagefind-ignore> + <figure> + <img src="images/uncorrected_brightness_sim.svg" alt=""> + <figcaption> + Calculated brightness curve for the uncorrected BCM setup. As you can see, at low setpoints the result + is about as smooth as sandpaper, which is well in line with our observations. At high setpoints the + offset gets swamped out and the nonlinearity in the low bits is not visible anymore. + </figcaption> + </figure> + <figure> + <img src="images/corrected_brightness_sim.svg" alt=""> + <figcaption> + Brightness curve for the corrected BCM setup extrapolated using actual measurements. Looks as buttery + smooth in real life as it does in this plot. + </figcaption> + </figcaption> + </figure> +</div></div> +</div> +<div class="section" id="controlling-the-driver"> +<h3>Controlling the driver</h3> +<p>Now that our driver was behaving linear enough that you couldn't see it actually wasn't we needed a nice way to control +it from a computer of our choice. In the ultimate application (our staircase) we'll use a raspberry pi for this. Since +we already settled on an <a class="reference external" href="https://en.wikipedia.org/wiki/RS-485">RS485</a> bus for its robustness and simplicity, we had to device a protocol to control the driver +over this bus. Here, we settled on a simple, <a class="reference external" href="https://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing">COBS</a>-based protocol for the reasons I wrote about in <a class="reference external" href="serial-protocols">How to talk to your +microcontroller over serial</a>.</p> +<p>To address our driver nodes, we modified the Makefile to build a random 32-bit MAC into each firmware image. The +protocol has only five message types:</p> +<ol class="arabic simple"> +<li>A 0-byte <em>ping</em> packet, to which each node would reply with its own address in the +first 100ms after boot. This can be used to initially discover the addresses of all nodes connected to the bus. You'd +spam the bus with <em>ping</em> packets, and then hit reset on each node in turn. The control computer would then receive +each device's MAC address as you hit reset.</li> +<li>A 4-byte <em>address</em> packet that says which device that the following packet is for. This way of us using the packet +length instead of a packet type field is not particularly elegant, but our system is simple enough and it was easy to +implement.</li> +<li>A 64-byte <em>frame buffer</em> packet that contains 16 bits of left-aligned brightness data for every channel</li> +<li>A one-byte <em>get status</em> packet that tells the device to respond with...</li> +<li>...a 27-byte status packet containing a brief description of the firmware (version number, channel count, bit depth +etc.) as well as the device's current life stats (VCC, temperature, uptime, UART frame errors etc.).</li> +</ol> +<p>Wrapped up in a nice python interface we can now easily enumerate any drivers we connect to a bus, query their status +and control their outputs.</p> +</div> +<div class="section" id="conclusion"> +<h3>Conclusion</h3> +<div class="subfigure" data-pagefind-ignore> + <figure> + <a href="images/olsndot_schematic.png"> + <img src="images/olsndot_schematic.png" alt="A picture of the LED driver schematic"> + </a> + <figcaption>The LED driver <a href="images/olsndot_schematic.png">schematic</a></figcaption> + </figure> + <figure> + <a href="images/olsndot_pcb.png"> + <img src="images/olsndot_pcb.png" alt="A picture of the LED driver PCB layout"> + </a> + <figcaption>The LED driver <a href="images/olsndot_pcb.png">PCB layout</a></figcaption> + </figure> +</div><p>Putting some thought into the control circuitry and software, you can easily control large numbers of channels of LEDs +using extremely inexpensive driving hardware without any compromises on dynamic range. The design we settled on can +drive 32 channels of LED tape with a dynamic range of 14bit at a BOM cost of below 10€. All it really takes is a couple +of shift registers and a mildly bored STM32 microcontroller.</p> +<p>Get a PDF file of the schematic and PCB layout <a class="reference external" href="olsndot_v02_schematics_and_pcb.pdf">here</a> or download the CAD files +and the firmware sources <a class="reference external" href="https://github.com/jaseg/led_drv">from github</a>. You can view the Jupyter notebook used to +analyze the brightness measurement data <a class="reference external" href="http://nbviewer.jupyter.org/github/jaseg/led_drv/blob/master/doc/Run_analysis.ipynb">here</a>.</p> +</div> +</div> +</div> + </main><footer> + Copyright © 2023 Jan Sebastian Götte + / <a href="/about/">About</a> + / <a href="/imprint/">Imprint</a> +</footer> +<script src="/pagefind/pagefind-ui.js"></script> + <script> + if(navigator.getEnvironmentIntegrity!==undefined)document.querySelector('body').innerHTML=`<h1>Your browser + contains Google DRM</h1>"Web Environment Integrity" is a Google euphemism for a DRM that is designed to + prevent ad-blocking, and which Google has forced into their browsers against widespread public opposition. + In support of an open web, this website does not function with this DRM. 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