# IoT Battery Monitor
## Overview
https://youtu.be/G-mK4szM4Ng
Build an internet connected battery charger and monitor with Feather ESP32-S2 Reverse TFT, CircuitPython, and Adafruit IO.
The on-board MAX17048 LiPoly battery monitor chip reads the batteries voltage and is displayed on the Feather ESP32's built-in color TFT display. Use the on-board button to cycle between icons and text.
The project uses Adafruit IO actions to receive an SMS text or email when the battery is fully charged.
## Enclosure
The 3D printed enclosure snap fits together, and features a tray for holding a 1200mAh battery. The enclosure can swivel forwards and back allowing for an adjustable viewing angle.
Use a JST extension cable to easily swap out batteries without having to unplug from the Feather.
## Parts
### Adafruit ESP32-S2 Reverse TFT Feather
[Adafruit ESP32-S2 Reverse TFT Feather](https://www.adafruit.com/product/5345)
Like Missy Elliot, we like to ["put our [Feather] down, flip it and reverse it"](https://www.youtube.com/watch?v=cjIvu7e6Wq8) and that's exactly what we've done with this new development board. It's basically our ****
Out of Stock
[Buy Now](https://www.adafruit.com/product/5345)
[Related Guides to the Product](https://learn.adafruit.com/products/5345/guides)
### JST-PH Battery Extension Cable - 500mm
[JST-PH Battery Extension Cable - 500mm](https://www.adafruit.com/product/1131)
By popular demand, we now have a handy extension cord for all of our JST PH-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH compatible socket, and the other end has a matching plug. Between the two, 500mm of color coded wire. Handy for wearable...
In Stock
[Buy Now](https://www.adafruit.com/product/1131)
[Related Guides to the Product](https://learn.adafruit.com/products/1131/guides)
### Pink and Purple Woven USB A to USB C Cable - 2 meters long
[Pink and Purple Woven USB A to USB C Cable - 2 meters long](https://www.adafruit.com/product/5044)
This cable is not only super-fashionable, with a woven pink and purple Blinka-like pattern, it's also made for USB C for our modernized breakout boards, Feathers and more. [If you want something just like it but for Micro B, we have a B...](https://www.adafruit.com/product/4111)
Out of Stock
[Buy Now](https://www.adafruit.com/product/5044)
[Related Guides to the Product](https://learn.adafruit.com/products/5044/guides)
### 5V 1A (1000mA) USB port power supply - UL Listed
[5V 1A (1000mA) USB port power supply - UL Listed](https://www.adafruit.com/product/501)
Need a USB jack for charging or powering a project, but don't want to lug around a computer? This switching supply gives a clean regulated output at up to 1000mA! 110 or 240 input, so it works in any country. The plugs are "US 2-prong" style so you may need a plug adapter, but...
In Stock
[Buy Now](https://www.adafruit.com/product/501)
[Related Guides to the Product](https://learn.adafruit.com/products/501/guides)
### Battery Options
### Part: 100mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 100mAh
[100mAh](https://www.adafruit.com/product/1570)
### Part: 150mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 150mAh
[150mAh](https://www.adafruit.com/product/1317)
### Part: 350mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 350mAh
[350mAh](https://www.adafruit.com/product/4237)
### Part: 400mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 400mAh
[400mAh](https://www.adafruit.com/product/3898)
### Part: 420mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 420mAh
[420mAh](https://www.adafruit.com/product/4236)
### Part: 500mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 500mAh
[500mAh](https://www.adafruit.com/product/1578)
### Part: 1200mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 1200mAh
[1200mAh](https://www.adafruit.com/product/258)
### Part: 2000mAh
quantity: 1
Lithium Ion Polymer Battery - 3.7v 2000mAh
[2000mAh](https://www.adafruit.com/product/2011)
## Hardware
The following hardware is necessary for the case assembly.
- 4x M2.5 x 6mm long machine screws
- 2x M2 x 6mm long FF standoffs
- [Next Page](https://learn.adafruit.com/iot-battery-monitor/cad-files.md)
## Featured Products
### Adafruit ESP32-S2 Reverse TFT Feather
[Adafruit ESP32-S2 Reverse TFT Feather](https://www.adafruit.com/product/5345)
Like Missy Elliot, we like to ["put our [Feather] down, flip it and reverse it"](https://www.youtube.com/watch?v=cjIvu7e6Wq8) and that's exactly what we've done with this new development board. It's basically our ****
Out of Stock
[Buy Now](https://www.adafruit.com/product/5345)
[Related Guides to the Product](https://learn.adafruit.com/products/5345/guides)
### JST-PH Battery Extension Cable - 500mm
[JST-PH Battery Extension Cable - 500mm](https://www.adafruit.com/product/1131)
By popular demand, we now have a handy extension cord for all of our JST PH-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH compatible socket, and the other end has a matching plug. Between the two, 500mm of color coded wire. Handy for wearable...
In Stock
[Buy Now](https://www.adafruit.com/product/1131)
[Related Guides to the Product](https://learn.adafruit.com/products/1131/guides)
### Lithium Ion Polymer Battery - 3.7v 100mAh
[Lithium Ion Polymer Battery - 3.7v 100mAh](https://www.adafruit.com/product/1570)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of ~100mAh for a total of about 0.4 Wh. If you need a larger battery,
In Stock
[Buy Now](https://www.adafruit.com/product/1570)
[Related Guides to the Product](https://learn.adafruit.com/products/1570/guides)
### Lithium Ion Polymer Battery with Short Cable - 3.7V 350mAh
[Lithium Ion Polymer Battery with Short Cable - 3.7V 350mAh](https://www.adafruit.com/product/4237)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 350mAh for a total of about 1.3 Wh. If you need a larger (or smaller!) battery,
In Stock
[Buy Now](https://www.adafruit.com/product/4237)
[Related Guides to the Product](https://learn.adafruit.com/products/4237/guides)
### Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh
[Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh](https://www.adafruit.com/product/3898)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of **400mAh** for a total of about 1.9 Wh. If you need a larger (or smaller!)...
Out of Stock
[Buy Now](https://www.adafruit.com/product/3898)
[Related Guides to the Product](https://learn.adafruit.com/products/3898/guides)
### Lithium Ion Polymer Battery - 3.7v 500mAh
[Lithium Ion Polymer Battery - 3.7v 500mAh](https://www.adafruit.com/product/1578)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 500mAh for a total of about 1.9 Wh. If you need a larger (or smaller!) battery,
Out of Stock
[Buy Now](https://www.adafruit.com/product/1578)
[Related Guides to the Product](https://learn.adafruit.com/products/1578/guides)
### Lithium Ion Polymer Battery - 3.7v 1200mAh
[Lithium Ion Polymer Battery - 3.7v 1200mAh](https://www.adafruit.com/product/258)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 1200mAh for a total of about 4.5 Wh. If you need a larger battery,
In Stock
[Buy Now](https://www.adafruit.com/product/258)
[Related Guides to the Product](https://learn.adafruit.com/products/258/guides)
### Lithium Ion Battery - 3.7V 2000mAh
[Lithium Ion Battery - 3.7V 2000mAh](https://www.adafruit.com/product/2011)
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This battery has a capacity of 2000mAh. If you need a larger (or smaller!) battery,
Out of Stock
[Buy Now](https://www.adafruit.com/product/2011)
[Related Guides to the Product](https://learn.adafruit.com/products/2011/guides)
## Related Guides
- [Adafruit ESP32-S2 Reverse TFT Feather](https://learn.adafruit.com/esp32-s2-reverse-tft-feather.md)
- [CircuitPython OctoPrint Controller and Monitor](https://learn.adafruit.com/circuitpython-octoprint-controller-and-monitor.md)
- [Stand for Feather ESP32 with Reverse TFT](https://learn.adafruit.com/stand-for-feather-esp32-with-reverse-tft.md)
- [Servo Boss](https://learn.adafruit.com/servo-boss.md)
- [ESP32-S2 Reverse TFT Digital Clock Display featuring Blanka-chan!](https://learn.adafruit.com/esp32-s2-tft-digital-clock-display-featuring-blanka-chan.md)
- [USB C Power Delivery Monitor](https://learn.adafruit.com/usb-c-benchtop-power-supply.md)
- [Air Quality Monitor and Case](https://learn.adafruit.com/aqi-case.md)
- [Smart Mirror with PyPortal](https://learn.adafruit.com/smart-mirror-with-pyportal.md)
- [How to convert Eagle PCBs to 3D Models in Fusion 360](https://learn.adafruit.com/how-to-convert-eagle-pcbs-to-3d-models-in-fusion-360.md)
- [Adafruit Audio BFF](https://learn.adafruit.com/adafruit-audio-bff.md)
- [Tombstone Prop-Maker RP2040](https://learn.adafruit.com/tombstone-prop-maker-rp2040.md)
- [PyPortal Trivia Time with the Open Trivia Database](https://learn.adafruit.com/pyportal-trivia-time-open-trivia-database.md)
- [ESP-NOW in CircuitPython](https://learn.adafruit.com/esp-now-in-circuitpython.md)
- [Adafruit Feather RP2040 Adalogger](https://learn.adafruit.com/adafruit-feather-rp2040-adalogger.md)
- [Multi-Sensor IoT Environmental Sensor Box With CircuitPython](https://learn.adafruit.com/remote-iot-environmental-sensor.md)