Hi FamilyMan,
I’m building a somewhat similar project where I’m using Stone HMI as input to Arduino Mega to turn on and off a relay.
Our source codes are very different though. I included software serial library so I can use other IO’s apart from the default TX/RX pins. Do you mind to explain this line “uint8_t buff[9]={0};” ?
Thank you in advance for your reply 🙂