# ADC input on Enviro+
**URL:** https://forums.pimoroni.com/t/adc-input-on-enviro/25201
**Category:** Support
**Created:** [August 1, 2024, 9:22pm UTC](https://forums.pimoroni.com/t/adc-input-on-enviro/25201 "2024-08-01T21:22:40Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@shemminger](https://forums.pimoroni.com/u/shemminger)
#### Post date: [August 1, 2024, 9:22pm UTC](https://forums.pimoroni.com/t/adc-input-on-enviro/25201/1 "2024-08-01T21:22:40Z")
I have an Envrio+ HAT and wonder if the ADC pad on the top could be used for measuring an external voltage? The schematic shows a multiplex for 4 inputs and 3 are used by the gas sensor.
I am making a monitor for a small trailer, and would like to monitor the 12V battery charge.
The plan was to connect a voltage divider to 3.3v (with over voltage protection).
And measure that with ADC input. Not sure how to get at through the adc in the library.
---
### Author:  [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)
#### Post date: [August 1, 2024, 11:00pm UTC](https://forums.pimoroni.com/t/adc-input-on-enviro/25201/2 "2024-08-01T23:00:16Z")
This may help,
[ADS1015 +/-24V ADC breakout (pimoroni.com)](https://shop.pimoroni.com/products/ads1015-adc-breakout?variant=27859155026003)
[pimoroni/ads1015-python: Python library for the Pimoroni ADS1015 breakout (github.com)](https://github.com/pimoroni/ads1015-python)
And looking here I see
[Enviro Plus at Raspberry Pi GPIO Pinout](https://pinout.xyz/pinout/enviro_plus)
- 0x49: ADS1015
The breakout uses 0x48 for its i2c address so you will need to edit the code to use 0x49, to use the one on the Enviro+