simple serial between two Arduino

Projects Networking, Protocols, and Devices
1

I need to connect a pair of UNOs together over serial
the first (master) will be connected to PC using normal USB
that's working fine :slight_smile:

I want to be able to pass commands to a second UNO (slave)
my plan (four-letter word I know!) is to use SoftwareSerial on the master
and connect pins 11 and 12 of the master to pins 0 and 1 of the slave

I tried, but with little success
is my plan flawed?

any help much appreciated:)
thanks

2

aha!
it helps if
a) both ends are using the same baud rate
b) TX and RX are crossed over

I can now turn LED 13 on and off on both master and slave using commands to master!
same software running in both UNOs

result :slight_smile:

3

Don't forget to connect Gnd to Gnd also.

4

CrossRoads:
Don't forget to connect Gnd to Gnd also.

yup I remembered that part :slight_smile:
all working nicely now, thanks