---
title: "ESP32 as a low power sensor"
date: 2024-04-20
---
Notes on using an ESP32 as a low power sensor:

Battery:

- I have some 18650's already
- Battery holder is 76 x 21 x 19
- LiPo drop by about 1 % per month
- 3000 mAh at 1 %/month is ~40 uA/h

ESP32:

- FireBeetle 2 ESP32-C6 is apparently 20 uA in deep sleep
- 60 x 25.4 x 7.3 mm
- Takes up to a 6 V panel

Panel:

- Could use a solar panel to top up the power
- A 5 V 65 mA panel is 68 x 36 mm
- Ideally the LiPo should stay cool, but the panel should get sun...

Box:

- Maximum of dimensions is 76 x 36 x 19 mm
- Purecrea have a small 77 x 52 x 28 mm inside dimension box