Rotoye Batmon

Rotoye Batmon is a kit for adding smart battery functionality to off-the-shelf Lithium-Ion and LiPo batteries. It can be purchased as a standalone unit or as part of a factory-assembled smart-battery.

At time of writing you can only use Batmon by building a custom branch of PX4. Support in the codeline is pending PR approval.

Where to Buy

Rotoye Store: Batmon kits, custom smart-batteries, and accessories

Wiring/Connections

The Rotoye Batmon system uses an XT-90 battery connector with I2C pins, and an opti-isolator board to transmit data.

More details can be found here

Software Setup

Build PX4 Firmware

1. Clone or download Rotoye's fork of PX4:

   git clone https://github.com/rotoye/PX4-Autopilot.git
   cd PX4-Autopilot

2. Checkout the batmon_4.03 branch

   git fetch origin batmon_4.03
   git checkout batmon_4.03

3. Build and upload the firmware for your target board

Configure Parameters

In QGroundControl:

1. Set the following parameters:
   • BATx_SOURCE to External,
   • SENS_EN_BAT to true,
   • BAT_SMBUS_MODEL to 3:Rotoye
2. Open the MAVLink Console
3. Start the batt_smbus driver in the console. For example, to run two BatMons on the same bus:

   batt_smbus start -X -b 1 -a 11 # External bus 1, address 0x0b  
   batt_smbus start -X -b 1 -a 12 # External bus 1, address 0x0c

Further Information

Quick Start Guide (Rotoye)