sqfmi/badgy

Battery voltage

gordonendersby opened this issue · 4 comments

gordonendersby commented

Is it possible to measure the battery voltage?

Or have you considered using the adc with a voltage divider?

sqfmi commented

Hi @gordonendersby!

Currently the ADC is not in use for Badgy, so you can connect a voltage divider (e.g. 220K/100K) and connect it to the ADC pin. This may be available in the next version :). Thanks!

gordonendersby commented

Ive worked this out now after reminding myself how to measure the internal vcc.

The internal ADC can measure the battery. No need for voltage dividers unless you want to measure an outside source or other analogue source.
Ideally before the wireless is turned on due to drain.

`/* Needed to point adc at internal vcc*/
ADC_MODE(ADC_VCC);

/* in startup */
float vccVolt = ((float)ESP.getVcc())/1024;
`
It would be great if you just broke out any spare pins to pads that a pin header can be connected too.

gordonendersby commented

Closed as you can use internal ADC to VCC

sqfmi commented

The internal ADC measures the input voltage to the ESP, which is regulated by the LDO, not the actual battery's voltage.