yashmulgaonkar / b-uosd

Super-Buper Battery microOSD (8.8mm X 6mm)

Battery voltage microOSD v1.2

Very small and simple OSD for monitoring Battery voltage. It is useful for AIO micro cameras, FPV helmet etc.

The PCB is very small. Can be ordered at OshPark: https://oshpark.com/shared_projects/nvOy0lBm

Functionality

• Supports 1S-4S battery monitoring. (Changing onboard voltage divider can be extended for bigger batteries.)
• Adjustable text position.
• Shows current voltage and minimal detected voltage.
• Pilot name, Crosshair and timer.
• Voltage blinking if battery running low.
• Supply voltage 3.3-5.5v.
• Low supply current, no heat generation.
• It is very small size (8.8mm X 6mm).
• Virtually weights nothing.
• Configurable parameters via compiling.

It has minuses too.

• Due to small and slow mcu (no special mcu for signal generation) the OSD picture is not as stable as other bigger OSDs.
• No shadow around the symbols (not visible on white background). Planned it rhe future releases.

Discussion is here: https://www.rcgroups.com/forums/showthread.php?2985720-uOSD-World-smallest-micro-OSD

Some screenshots:

Connection

There is many possibilities to use this OSD. One example for 1S setup:

Another example for AIO combo camera/vtx 1S setup:

Compilation

To compile source files there is several options.

Under Linux (even cheap OrangePi board will work)

Install avra and git

apt-get install avra git

Clone the project to any directory

git clone https://github.com/nppc/B-uOSD.git

Navigate to Bin directory

cd B-uOSD/Bin

And run compile_linux.sh script

./compile_linux.sh

Now you have .hex file.

Under Windows

Project can be compiled with AVRASM2 (similar to avra on Linux) or with AVR Studio.

Flashing

Use avrdude software and USBASP dongle for flashing microcontroller.

avrdude.exe -c usbasp -p t13 -P usb -B 4.0 -U flash:w:B-uOSD_vXX.hex:a