3 x Nano V3.0 Module ATMega168 16MHz CH340 MiniUSB for Arduino Compatible 2020
1 to the TTL level a serial port to send and receive port RX/TX. We'll provide you a satisfying solution. We will try our best to avoid any quality problem. 20 digital input/output port RX and TX, D2 ~ D13, A0 ~ A5.