Setting up an OSD to display telemetry in your FPV goggles involves both physical installation and software configuration. Most modern flight controllers have integrated OSDs, which makes the process straightforward compared to older standalone modules.
If you're using a flight controller with a built-in OSD, the hardware connection is simple. Run your FPV camera's video output to the designated video input pad on the flight controller, then connect the video output pad from the FC to your video transmitter. The OSD circuitry sits in between and overlays the telemetry data onto the video signal before it reaches your VTX.
For standalone OSD modules like the MinimOSD, you'll need to break the video signal path. Connect your camera to the video input on the OSD board, then the OSD output goes to your VTX. You'll also need to provide power to the OSD, typically from your PDB or a spare 5V output. Additionally, connect the TX and RX pads from the OSD to corresponding UART pads on your flight controller so telemetry data can flow to the OSD.
Configuration happens through your flight controller software. In Betaflight, navigate to the OSD tab where you'll see a grid representing your video feed. Here you can drag and drop elements like battery voltage, current draw, flight time, GPS coordinates, artificial horizon, throttle position, and many others. I typically place critical information like battery voltage and timer in the top corners where they're always visible but don't obstruct the center view.
You'll want to enable the specific sensors you need. If you want current monitoring, ensure your current sensor is properly configured in the Power tab first. For GPS coordinates and speed, your GPS must be connected and configured. The OSD simply displays what the flight controller knows.
Pay attention to voltage calibration. Go to the Power and Battery tab and adjust the voltage scale factor until the OSD reading matches what a multimeter shows on your battery. This ensures accurate low voltage warnings, which are crucial for preventing over-discharge during flights.
Most pilots keep their OSD minimal during racing to reduce distraction, showing only battery voltage, timer, and maybe RSSI signal strength. For freestyle or long-range flying, adding GPS data, altitude, speed, and compass heading becomes useful. Experiment with layouts during bench testing before flying to find what works for your flying style.
