MinimOSD: DIYDrone's ArduPilot Mega OSD Board for FPV cameras.
MinimOSD is a super-tiny board designed by 3DRobotics. It's all you need to get OSD telemetry data from ArduPilot Mega. Just connect your FPV camera and a video link and you're ready to fly with instruments on screen.
It's intended to be a dedicated APM telemetry video output. So, it reads MAVLink messages from its RX and request rates from APM if you connect its TX to ArduPilot "telem" port.
Important note: You cannot connect the OSD when your APM 2 is also connected via USB (they share the same port). Make sure you disconnect your USB cable from the APM 2 board before attempting to use the OSD.
It has the Max7456 chip powered by two stages to avoid noises from servos attached to ArduPilot Mega board.
The approach is to use two external power sources: 12V from a Lipo Battery and 5V from APM:
Raw 12V from Lipo Battery:
MinimOSD has no extra pins exposed, because the concept is "capturing all the needed data from MAVLink".
The format of the video does have an impact on how many characters the OSD can fit on the video feed. The MimimOSD can be configured by the ArduCAM OSD Config Tool to work at PAL or NTSC. The "PAL" solder jumper underneath the board is not used anymore (Firmware 2.0 or above).