Vinod S acquired some resistive touchpads and decided to interface one with a Bluetooth module so it would function as a wireless computer mouse. He explains, “I have used a cheap ATtiny13 (8 pin) microcontroller which runs at internal 9.6MHz clock. It samples two channel analog voltage from the touchpad. One of the GPIO pin is configured as a software UART TX (bit banging) which will stream the mouse data at a baudrate of 115200 to a PC via Bluetooth (HC_05 Bluetooth module). Apart from the mouse cursor movement, I have implemented left click, right click and wheels on the same touch screen. A Python script running on the PC will accepts the mouse data and it will process the data and apply a smoothing filter to make the cursor movement more efficient. Right now I did the code for Linux but will be easily portable by small modification in the Python code.”
Vinod shares the design schematic and code for the MCU (C) and PC side (Python) on his Electronics – the king of hobbies blog.
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