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srg74 / WLED-wemos-shield

Wemos D1 Mini (ESP8266) or Wemos ESP32 D1 Mini (ESP32) based universal shield for WLED firmware
https://github.com/srg74/WLED-wemos-shield
MIT License
490 stars 69 forks source link

R4 can't be 10K #72

Closed wz2b closed 2 years ago

wz2b commented 2 years ago

I built 10 of these boards and they work really well. One note that's probably a schematic/BOM error is R4 can't be 10K if you want the LED to work. For 10 mA or so you probably want something more like 270 ohms. For a power indicator, less current would probably be fine too - 330 would work.

srg74 commented 2 years ago

I understand your concern. 10K is used for very dim LED.

wz2b commented 2 years ago

Oh okay - I did not realize it was intentional. 10K with say a 3V drop across it is 300 microamps - I'm surprised you'd be able to see that at all. But perhaps in a very dark room you would.

Fair enough! Thanks for the reply.

On Fri, Aug 5, 2022 at 4:48 PM srg74 @.***> wrote:

I understand your concern. 10K is used for very dim LED.

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wz2b commented 2 years ago

Oh okay - I did not realize it was intentional. 10K with say a 3V drop across it is 300 microamps - I'm surprised you'd be able to see that at all. But perhaps in a very dark room you would.

Fair enough! Thanks for the reply.