Tag Archives: dc motor

Obstacle Avoiding Robot using AVR ATmega32 – Part III

Hello All, Welcome to the third part of the Obstacle Avoiding Robot Tutorial. Till now we have completed the mechanical construction and made the sensor for our robot. I have shown you how to control the motors and read values from sensor in last two parts of the tutorial. In this tutorial we create the master program for our robot. The job of the program is simple, to read values from the sensors, make a decision and command two motors. In this way our robot will roam about the room avoiding obstacles in its path. In our program we define three constants, namely RTHRES,CTHRES and LTHRES in the following way :- //Threshold Values For Sensor Triggering #define RTHRES 195 #define CTHRES 275 #define LTHRES 195 The constant value next to them is the triggering values. You can get this values as described in previous tutorial. Simply run the IR Sensor Test program and bring any obstacle near the sensor at about 15cm (6 inches) and note down these values against respective sensor threshold values. Do same for all three sensor. Now the program knows when the value comes near this threshold value, the sensor has a obstacle in front of it. Note that the value shown above is may not match with the values you obtained, that OK. In our […]