The wheel slots pass through the detector, generating pulses while robot is moving. A slotted wheel is used, mounted on the motor shaft, to work with the optical detector. Two detectors can be used to implement a control algorithm, like PID, if required (here only one detector is used, just to display the speed). This one is ATmega32 based, IR remote controlled (using TSOP1738 IR detector) with two optical detectors (MOC7811) provision to detect the robot speed.
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So here is the modified design of a Three-wheeled dual DC motor robot (with speed, direction and turning controls), using the popular L293D motor driver IC, which is very easy to control and size and power efficient, providing two full-bridge circuits in one IC, each having 1A capacity to drive a DC motor. Updated Design (done sometime in 2010, added here in 2018):Īs brought out by many in comments, above design is not power efficient, as it uses n-type MOSFETS in upper and lower, both the sides of the H-bridge. It can be easily adapted to other compilers with minor changes. The remote is not visible in the video as I was holding the camera and remote both!!)
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(Thanks a lot to Michael Spiceland from, for helping me out with the code for IR signal decoding!).įollowing buttons on the remote are used for control:Ĭheck out the video (the LED blinks whenevr a key on the remote is pressed. The IR codes were received by using TSOP1738 IR detector from Vishay. The circuit uses two PWM channels of ATmega8 for controlling the speed and direction (reverse, forward) of the car, based on the command received from the IR remote. The motor is fitted on a toy car wheels with gears, as shown in the figure above.įollowing is the schematic (Click on the image to enlarge it): Here, I'm extending the same circuit to control the DC motor with IR remote control. The circuit was build with microcontroller ATmega8. In my last post of Simple DC motor Control, I've discussed controlling a small DC motor using the PWM method with MOSFET H-bridge.
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