Sensor works only connected through FTDI... Please help

[Moshe Livne]

I have built my first aircon monitoring sensor. Works on a 3.3v pro mini with voltage reg and led cut out. Very simple really - connected to NRF and reed switch short d3 to gnd. It is powered by CR123 battery. While connected to the computer using a 3.3v FTDI its working fine. When connected using the CR123 it does nothing. I have checked voltage on the battery and its 3.12v.
The battery is connected to RAW and GND pins.
As I can't see the serial monitor messages while connected to the battery, I am a bit blind. Any help will be greatly appreciated!

[Sparkman]

@Moshe-Livne The raw pin is connected to the input side of the voltage regulator. Since you don't have a voltage regulator anymore, there's no path to power the chip. You need to connect it to the Vcc pin.

Cheers
Al

[Moshe Livne]

@Sparkman You are my hero! Thanks!!! Moved to vcc and everything works!

[Sparkman]

@Moshe-Livne Great, glad you got it working!

Cheers
Al

[Andreas Maurer]

Perhaps this makes clear what happend:

https://cdn.sparkfun.com/assets/0/7/5/5/1/51eec304ce395f104c000000.png

[Moshe Livne]

@Andreas-Maurer In retrospect it is very obvious....