Hi, I made a full PCB with Push Buttons, OLED and Bluetooth. The tests
were all ok. Then I uploaded the firmware and want to test it with a 12V
3A powerconnection.
It will work for a few seconds. Now the red Power LED is blinking. Why?
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Make sure no usb cable connected
Test to see if the board can be powered by just 12V without USB cable.
If not check the voltage with multimeter on VIN when 12V is on and should be about 8
I would load test program for leds/buzzer
Then disconnect USB cable completely
Then turn on 12V
Buzzer/leds should come on and off
If yes, then board is ok
If no then board has issue which you need to fix. I think it will be related to lm7808 circuitry
If yes, then issue must be with your settings in firmware file.
Last edit: brownrb 2018-04-01
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi, I made a full PCB with Push Buttons, OLED and Bluetooth. The tests
were all ok. Then I uploaded the firmware and want to test it with a 12V
3A powerconnection.
It will work for a few seconds. Now the red Power LED is blinking. Why?
https://www.youtube.com/watch?v=Kye_BaU67Aw
about 2m30s in
Make sure no usb cable connected
Test to see if the board can be powered by just 12V without USB cable.
If not check the voltage with multimeter on VIN when 12V is on and should be about 8
I would load test program for leds/buzzer
Then disconnect USB cable completely
Then turn on 12V
Buzzer/leds should come on and off
If yes, then board is ok
If no then board has issue which you need to fix. I think it will be related to lm7808 circuitry
If yes, then issue must be with your settings in firmware file.
Last edit: brownrb 2018-04-01