Signal Generator

A signal generator based on a Raspberry Pi Pico

The signal generator can generate square, triangular, saw-tooth, and sine waves of a 3.3 V amplitude and a variable frequency. The signal is generated by the microcontroller using PWM and then smoothed out using an RC low-pass filter with a cutoff frequency of 5 kHz.

Circuit Diagram

Component	Value
R1	270 Ω
C1	0.1 µF
RV1	10 kΩ

Dependencies

• make;

• cmake;

• gcc, g++;

• arm-none-eabi-gcc-cs or equivalent for ARM cross-compilation;

• arm-none-eabi-newlib or equivalent;

• Raspberry Pi Pico C/C++ SDK;

Building

Edit Source/CMakeLists.txt to include the pico_sdk_init.cmake from your Pico C/C++ SDK folder

include(~/Path/pico-sdk/pico_sdk_init.cmake)

Run the Source/build.sh script to build the firmware (and chmod +x ./Source/build.sh the first time). You can run a clean build by deleting the ./Source/build directory first.

cd ./Source
./build.sh

The firmware binary will be in ./Source/build/SignalGenerator.uf2.