"Mimmo emulator" is a CW Trainer created by IW1QLH.
It's based on ATMega 328 microcontroller, it can be used to receive morse code (only letters, only numbers, mixed, callsign) or to learn to transmit.
Speed: from 5 to 20 WPM
Space between characters: from 3 dots to 3 seconds
More details IW1QLH's amateur radio station