![]() Since the other terminal of the motor gets a positive from R元, it starts moving on the set direction. RL2 conducts and connects the particular wire of the motor to negative supply. This switches ON T2 and the corresponding relay RL2. 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.Īssuming 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. ![]() The transistor T1 which is a PNP responds to this logic low signal and conducts switching the attached relay RL1. This situation persists as long as the beam remains focused at it. ![]() ![]() When an IR (infrared) beam is focused at the sensor, the pin which is designated as the output becomes logic low. The circuit may be understood with the following explanations: How it WorksĪs can be seen in the given circuit diagram, the sensor is any standard three pin IR sensor module which would typically respond to any TV IR remote handset. The connected motor can be moved either ways and also can be made to halt. ![]()
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