OpenCWKeyerMK2 Hardware for K3NG Arduino keyer https://github.com/k3ng/k3ng_cw_keyer KIT is available from https://www.hamshop.cz/open-cw-keyer-c27/open-cw-keyer-i196/ Documentation https://github.com/ok1cdj/OpenCWKeyerMK2/wiki