-1 appears after pressing the reset button in serial monitor

Projects Programming
1

Hey

I need some help on removing -1 from my serial monitor data.
Actually, I interfaced STM board and Arduino using I2C and I am getting the desired data in Serial Monitor. However, initially (first time only) I am getting '-1' or '-' after pressing the rest button or automating mode. Due to this my whole structured is getting disturbed.

Could anyone tell my how to avoid the -1 or - ?

Thanks in advance!

2

Have you tried using a short delay after boot up, before initiating serial communications? Also if your PC side program is that sensitive to initial data, you need to implement a more robust protocol. Apart from that, nobody can guess because you haven't posted your code (in code tags please), or explained what you are doing with the serial data.

3

Thanks aarg,

Let me see with some short of delay then I will come back .