Circuit for USB power detection & measuring battery voltage

[odya-kun]

Please, confirm or fix this schematic. I want to perform detection of USB power presence and battery voltage.

• [Power Sensor] goes to ADS1115 connected via I2C. R6 & R8 is voltage divider.
• [A0] goes to Wemos D1 Mini A0 pin

[ShermanP]

I don't see anything that measures battery voltage. But I guess it detects that the battery hasn't shut down completely.

[odya-kun]

Sorry, fixed

[ShermanP]

I think the ESP8266 analog input only works between zero and 1 volt. If that's right, you'll need to divide down the battery voltage from a maximum 4.2V to 1.0V. Or you could pipe that line into the ADS1115 instead.

[johnerrington]

Nice schematic. Shame it doesnt show the bits you are asking about (the ads1115 and Wemos)
or have links for data sheets for the bits it does show?

[odya-kun]

Here it is: PetNet Feeder Revival - EasyEDA open source hardware lab

[jim-p]

Does USB power go here?

[odya-kun]

Yes

[jim-p]

Everything looks OK.
The only thing that I would change is to also connect pin 4 of the MT3608 module to ground.