The APM MinimOSD Kit revision 1.1 from 3DR is tailored for use with ArduPilot Mega and the MAVlink protocol and is designed to be as compact as possible. The main components are an ATmega328P 8-bit microcontroller with an Arduino bootloader, a MAX7456 monochrome on-screen display overlay, and an Arduino-based display board. Programming is done through an FTDI-compatible 6-pin cable.
The board features two independent power and ground sections to isolate the OSD's analog stage: a 5V section for the ATmega and the OSD's digital stage, powered through the FTDI cable or other 5V source; and a regulated + 5V section for the OSD's analog stage, powered through the video in/out header and capable of handling up to 12V input. Solder jumpers are available to combine the two power and ground sections if desired.