Connecting Arduino Mega with Arduino Robot over I2C

Other Hardware Robotics
1

Hello,

I would like to connect an Arduino Mega 2560 with a Arduino Robot (Arduino-Robot) over I2C. But it seems that the Arduino Mega is not correctly connected to the Arduino Robot.

Communication between the Robot and the Mega:
The Arduino Robot works as a Master and the Arduino Mega as a slave, I have used the code from this page: (https://www.instructables.com/id/I2C-between-Arduinos/).

How both boards are connected together:
I have used the Pins 20(SDA),21(SCL), Vin and GND to connect it with the Robot's Control board. In the attachement "I2C_Connections" you can see where I have it connected to. This post helped me to find where I have to connect the Arduino Mega to the robot: (Arduino robot I2C - Robotics - Arduino Forum)

Problem identification:
When I turn on the robot, the "ON" LED of the Arduino Mega shines bright but the "L" LED glows very faintly and goes out after a couple of seconds, sometimes the LED doesn't even glow when I restart the robot.

CircuitDiagram.png
CircuitDiagram.png1280×800 58.3 KB

I2C_Connections.png
I2C_Connections.png1280×800 151 KB

2

When I turn on the robot, the "ON" LED of the Arduino Mega shines bright but the "L" LED glows very faintly and goes out after a couple of seconds, sometimes the LED doesn't even glow when I restart the robot.

looks like you have a problem with your Arduino Mega.
Have you try to changes with the same arduino and upload the same code?

niel...