| Electronics > Beginners |
| Addressable LED hell |
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| Buriedcode:
--- Quote from: cbowen on May 20, 2019, 03:48:17 pm ---@Buriedcode, you recommended using a wire. I'm not sure how that would work with surface mount pads. I'm afraid if the wire would be filling the hole, it would prevent the solder from making it down to the pad and having a good connection. ... --- End quote --- Ahh yes sorry, I meant to fix the "carrier" boards to the main board, not individual devices. |
| chris_leyson:
Can't say I've had any problems hand soldering WS2812B's. Each WS2812B does need a 100n decoupling cap as jeremy pointed out. Also, I found that the first LED in the string usually needs a series resistor of a few hundred Ohms connected to it's data input, I tested a few Adafruit 8x8 Neopixel panels and without the series resistor only the first LED in the string would work and even then it was a bit random. 330 Ohms fixed it but I didn't get around to having a good look with a scope. |
| cbowen:
yeah, all that is in place. Eh, screw it. I'll just post the PCB. |
| Buriedcode:
Thats a cool shaped PCB. One thing.. well a few things actually.. If you rotate each device 180 degree's then each output will flow to the next devices input. Also, why not just two fat traces for VCC and GND running parallel with all the devices? That also makes decoupling caps easier since they are just across the rails. Right now it looks like you're splitting up the ground or power rail into lots of thin traces. With bags of space there you could even have a ground plane - although I'd advise against it if you're worried about these things over heating during soldering. But you could still have two wide rails for the power lines and have a very short thinner trace coming off those to the device as a sort of thermal - still very low impedance, but without the heatsink. |
| Liam:
Send a photo of what you got. It will be clearer what you have a problem. My blog: https://wisepick.org/best-electric-toothbrush-for-kids/ |
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