README.md


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# OpenMano
## Open source and modular manometer

![OpenMano](openmano-hw.png "OpenMano")

An open source manometer hardware and firmware implementation. Originally designed for monitoring pressure in scuba diving equipment; modified for modularity and battery-powered operation.

OpenMano comprises of a base PCB design and "mods" which stack onto the base board. The base board is powered by a STM32F405 MCU and contains a battery holder for 18650 batteries along with a battery charge management IC. The base board breaks out multiple peripheral buses which the mods use, including I2C, UART, SPI as well as 8 GPIO pins.

## Mods

![Zigbee mod](openmano-mod-zigbee.png "Zigbee mod")

Mods enable extending the functionality of the base board using the peripheral buses provided with the breakout. The DXF for the base board contains a template for making mods with a 20-pin connector that allows stacking mods. 

A sample mod with wireless functionality over Zigbee is included in pcb/mods/zigbee. This mod uses the UART peripheral along with numerous GPIOs required for the Digi-Xbee module.