# Pycom Expansion Board 3.1

**Type:** Product page · **SKU:** CE05545 · **Brand:** [Pycom](https://core-electronics.com.au/brands/pycom)
**Page:** https://core-electronics.com.au/pycom-expansion-board-3-1.html ([markdown](https://core-electronics.com.au/pycom-expansion-board-3-1.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## Description

Introducing the Expansion Board 3.1, compatible with the [WiPy](https://core-electronics.com.au/pycom-wipy-3-0.html), LoPy, [LoPy4](https://core-electronics.com.au/pycom-lopy4.html), [SiPy](https://core-electronics.com.au/pycom-sipy.html), [FiPy](https://core-electronics.com.au/pycom-fipy-py.html) and [GPy](https://core-electronics.com.au/pycom-gpy-py.html).

NOTE: Does not include the [WiPy](https://core-electronics.com.au/pycom-wipy-3-0.html)

### Features

- USB and LiPo battery powered
- Custom PIC USB to serial converter with automatic bootloader mode
- LiPo battery charger (BQ24040), with options for two different charging currents (100mA and 450mA)
- TPS2115A with reverse voltage protection
- MicroSD card slot
- JST-PH style battery connector
- Power LED and charge status LED
- One user LED and one user switch
- Button to enter into “safe mode” easily
- Battery voltage monitoring via the WiPy ADC
- Lots of jumpers to enable/disable features
 
### Dimensions

- Size: 65 x 50 x 8mm
- Weight: 18g
 
### Datasheets

- [Specifications](https://docs.pycom.io/datasheets/boards/expansion3)
- [Pinout Diagram](https://docs.pycom.io/datasheets/boards/expansion3#pinout)
- [Documentation](https://docs.pycom.io/)

## Guides for this product

- [WS2812 / NeoPixel Addressable LEDs: Pycom Quickstart Guide](https://core-electronics.com.au/guides/pycom/WS2812_and_NeoPixel_with_Pycom/)
- [How to Debug MicroPython Code](https://core-electronics.com.au/guides/micropython/connect-to-MicroPython-in-windows/)
- [Temperature Sensing with the TMP36 and Pycom](https://core-electronics.com.au/guides/pycom/temperature-sensing-pycom-tmp36-tutorial/)
- [Light Sensing with an LDR and Pycom](https://core-electronics.com.au/guides/pycom/sensing-light-with-ldr-and-pycom-lopy4/)

## Videos for this product

- [Pycom LoPy4 Nano Gateway for LoRaWAN](https://core-electronics.com.au/videos/pycom-lopy4-nano-gateway-for-lorawan)
- [Getting Started with Pycom GPy](https://core-electronics.com.au/videos/getting-started-with-pycom-gpy)
- [How to Update Firmware on Pycom GPy & FiPy Cellular LTE](https://core-electronics.com.au/videos/how-to-update-firmware-on-pycom-gpy-fipy-cellular-lte)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/p/y/pycom-expansion-3-1.jpg)