tfabris
commented
6 years ago Will need to:
- Rev3 board: Cut 5v trace in two places to prevent the 5v supply from the pololu to reach anything.
- Rev3 board: Jumper 5v from pololu to VIN on the arduino.
At this point verify and test that you get 5v and 3v in the expected places coming out of the Arduino. Then you can:
- Rev3 board: Cut 5v trace running to the Betz 5vin pin. -OR- cut the jumper on the Betz of CHG_ENA. Both will result in the same thing. Maybe one is safer than the other? Dunno.
- Jumper 3v from Arduino to Betz 3v3 pin.
- Jumper 5v from Arduino to Arduino Button.
- Jumper 5v from Arduino to other possible places 5v is needed such as the RS232 chip.
- Investigate and learn more on the schematic and data sheet about the function of VREG_ENA which is connecteted to the ON switch and/or the reset button and/or the voltage regulator. The BATT voltage is used for all of those. IS any of the BATT voltage needed for anything if I'm powering my chip directly from the 3v3 pin and issuing my own RESET line command?
- Think and look carefully for other places.
If the above works, check chip temperature and serial output. Is there serial garbage?
- Possibly adjust or remove the pullup resistors on the Arduino RX.
It's possible that if you disconnect the 5V supply to the Betz board you might be able to power 3v into its 3v3 pin.
Check to make sure that your 3v output pin from the Arduino is really generating 3v and see if that works. Make sure it works in all modes.
Make sure not to power 5v and 3v at the same time into the Betz board.
Check your temperature.