Hi,The error dialogue means, | Microcontroller › 8051 › Bluetooth heart rate monitor? › Hi,The error dialogue means, February 16, 2014 at 1:22 pm #11033 AJISH ALFREDParticipant Hi, The error dialogue means, you frogot to include the header file having the defenition of P1. I think this must be it #include<reg51.h>
