Hardware and software for a CW (Morse Code) trainer ... Audio and visual.
The design goal is to make a stand-alone CW trainer.
Parts:
- Raspberry Pi -- any generation
- SD card 4 GB or larger
- Power supply
- Freenove Super Starter Kit for Raspberry Pi
- About $22 on Amazon
- Includes breakout board
- LED and resistor
- LCD screen with I2C controller
- Potentiometer * 2
- ADC chip via I2C
- Speaker (passive buzzer with transistor driver)
- LED matrix screen
- Pushbuttons
Software:
- Raspbian OS https://www.raspbian.com
- pigpio library https://abyz.me.uk/pigpio/ or https://github.com/joan2937/pigpio
Installation
- Install raspbian OS
- Install pigpio
- Need cmake sudo apt install cmake
- From Github:
git clone https://github.com/joan2937/pigio
cd pigpio
mkdir build
cd build
cmake ../
make -j4
sudo make install
sudo systemctl start pigpiod.service
sudo systemctl enable pigpiod.service
sudo systemctl status pigpiod.service
cd ~
- Python module
pip3 install pigpio
- Enable I2c control
- sudo raspi-config
- Uses simpleaudio module
- Native methods in each platform
- Monaural, 16 bit resolution
- Sine wave with edge smoothing
- numpy for calculating waveform
- Controls: pitch, volume in menu
- Works poorly at high speeds (Dits are lost)
- Uses GPIO pin from Pi header board:
- Image from this reference
- GPIO 5 = Header pin 29 is used to LED with 10K resistor to ground