I used to use SoftwareSerial(8, 7) //8: RX, 7: TX It worked perfectly.
recently, I made a PCB, I accidently changed the connection order of TX and RX. So I changed the code to SoftwareSerial(7, 8) but It's not working. Can somebody tell me why? I don't want to spend extra money making new PCBs.
Thanks a lot!