I2C communication

Projects Programming
1

Hello everyone,
I have a Arduino Mega2560 micro-controller and four ATMEGA32A micro-controllers. I want to use the Arduino controller as a master and the rest as slaves. I need to start and stop the execution of the programs that are running in the slave micro-controllers through the master.Suppose, In one of the slaves, I have programmed for a stepper motor which is connected to a ball-screw(for linear motion). In the second slave micro-controller I have written code for a robotic arm movement. I do not want to run both the processes simultaneously. i.e. when the stepper moves i don't want the robotic arm to do its job. So please give me some hints how to communicate and control the slaves from the master.

Thanks in advance.

2

http://arduino.cc/en/Tutorial/MasterReader will show you how to connect a slave to a master device and how to comminicate from the master to the slave.

The example actually sends data back to the master but this does not have to be implemented. The function executed by the Wire.onRequest() could top/start actions on the slave by setting a flag and then change its state on receipt of a second message.