From 7f7e1e7738aeb17ea19e46bfe97952deeee8c56a Mon Sep 17 00:00:00 2001
From: Aditya Naik
Date: Sun, 25 Apr 2021 21:27:10 -0400
Subject: Zigbee mod 3D

Added Zigbee mod 3D image in readme. Updated readme with details about
the mods.
---
 README.md | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'README.md')

diff --git a/README.md b/README.md
index 2a4c543..42151ad 100644
--- a/README.md
+++ b/README.md
@@ -5,5 +5,12 @@
 
 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 DXF for the base board contains a template for making mods with a 20-pin connector that allows stacking mods. The base board breaks out multiple peripheral buses which the mods use, including I2C, UART, SPI as well as 8 GPIO pins.
+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.
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