The yellow led on the BrickPi3 is not flashing at all. All Dexter Industry sites say that the led has to flash once per second if it is working properly and the voltage is adequate. When I ran the troubleshoot, the log.txt appeared within a few milliseconds and says ‘No SPI Response’. Should I be worried about this?
Make sure the BrickPi3 software is up to date by running this command:
curl -kL dexterindustries.com/update_brickpi3 | bash
and then restart the RPi by running this command
sudo reboot
When the BrickPi3 is connected to the RPi, and the RPi is running with the BrickPi3 software installed, the yellow LED on the BrickPi3 (next to the power jack) should be flashing. If it’s not, try updating the firmware following the instructions here.