Measure voltage of AA battery

#1

Hi, I’m using an Heltec CubeCell ASR6501 for my dallas DS18B20 powered from 2 AA battery connected to VDD 3.3V and it’s GREAT !!!
What’s the best way to measure the voltage of my 2 AA battery ? Can I measure it on the VEXT pin when is activated and how ? Advice thinking that I dont wanna consume more that … nothing ?

#2

hi,

please refer the picture:
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#3

Hi,
I have the same problem. Where is on the HTCC-AB01
the resistor R16 on the board. R16 is originally connected to VBAT.
I want to change this and measure the voltage VDD. If I know where R16 is, I can make a change.

#4

Hi,

please refer the picture:

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图片.jpg377×663 135 KB

#5

Hi,
Thank you for your message.
But I need the information (R16) for the HTCC-AB01, not for the HTCC-AB02

#6

Sorry, my fault.

please refer the picture:
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