ZStack3_CC2530_EPD2in9 P1.3 - Key join/unjoin P2.0 - Key ON/OFF P1.4 - Relay(Led) ON/OFF EPD pins control P0.0 - DC P1.1 - RESET P1.2 - CS spi P1.5 - CLK P1.6 - MOSI P1.7 - MISO Image https://youtu.be/DEj1yZ5klt8