Iambic Keyer using the TTP223 module
This is a quick arduino based iambic keyer using TTP223 module to since the dot and dash from the user. TTP223 is a capacitive sensor IC that allows easy touch sensing. The module supports active high/low and latch byt shorting the jumpers A and B.
Below is the TTP223 module. The touch pad should face the thumb and index finger when installed into the PCB.
The prototype use the digispark copy. This very convenient as the board only measures 2.5cm x 2cm but need to be ordered online.
The actual PCB use the Gizduino-mini board because it is readily available locally. Don't forget to change the pin assignment.
Below is the PCB ready for toner transfer or photo transfer to a pre-synthesized PCB.
Download the pcb in pdf ready for toner transfer or photo transfer