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 NXP Semiconductors

  • IR Remote Controlled Motor Circuit

  • Created: Jan 21, 2015

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IR remote controlled motor circuit is another approach of controlling a dc motor. It uses infrared remote handset such as that observed in TV remote and DVD remote to trigger the switch. This project uses a 74HC4017 IC which is a 5‑stage Johnson decade counter with 10 decoded outputs, an output from the most significant flip‑flop, two clock inputs and an overriding asynchronous master reset input.

In this circuit, the connected motor can be moved either ways. The sensor is any standard three pin IR sensor module which would typically respond to any TV IR remote handset.When an IR (infrared) beam is focused at the sensor, the pin which is designated as the output becomes logic low. This situation persists as long as the beam remains focused. The transistor T1 which is a PNP responds to this logic low signal and conducts switching the attached relay RL1.The contacts instantly connect the instantaneous positive potential at the collector of the transistor to pin 14 of the IC1 which is wired as a flip flop circuit.Assuming the initial logic sequence to be at pin 3 of the IC, the above triggering shifts the sequence to pin 2 of the IC, making it high.This switches ON T2 and the corresponding relay RL2.RL2 conducts and connects the particular wire of the motor to negative supply. Since the other terminal of the motor gets a positive from RL3, it starts moving on the set direction.Now suppose, the sensor is given a subsequent trigger through the IR remote handset, the above process repeats and the output sequence shifts from pin#2 to pin#4 of IC1, which instantly switches ON T3 while switching OFF T2.The above action reverts the relay connections forcing the motor to instantly flip its rotational direction .With another subsequent trigger from the remote handset, the sequence bounces of back to pin#3, which is not connected to anything and results in switching off of the motor completely.The inclusion of L1, C1 ensures that the circuits does not get influenced with spurious triggering of the sensor. L1 can be experimented to get the optimal value so that it "grounds" only accidental stray external signals and not the actual IR signals from a remote control handset.

DC motors are widely used especially in the development of industrial power transmission systems. It is is capable of having variety of torque-speed characteristics depending on the circuit conditions. In addition, dc motors are used in mobile robotics such as observed in RC cars, mini fans and other toys to provide object motions. There are various methods of driving dc motors and that includes the use of infrared sensors and relays to trigger the motors. Generally, IR remote controlled motor circuits are used in RC planes, cars and other control systems observed that uses infrared in controlling motors.



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