REMOTE CONTROL FOR TOY CAR
101％ working project hello friends today I am gonna telling you about some easy and valuable electronics projects for school and college practical
Make any battery operated toy car remote controlled using this circuit . The circuit , consisting of an infrared transmitter - receiver pair , uses IR beam transmission to switch the toy car on or off . To operate the toy car , you need to hold the transmitter in your hand , keeping it pointed at the toy car which has the receiver fitted inside and simply press a switch provided on the transmitter . The transmitter works off 9V DC , while the receiver needs 6V DC.
Fig . 1 shows the transmitter circuit . It is built around two BC558 transistors ( T1 and T2 ) , three BC548 transistors ( T3 , T4 and T5 ) , IR LED1 and a few discrete components .
Fig . 2 shows the receiver circuit . It is built around IR receiver module TSOP1738 , two BC548 transistors ( T6 and 17 ) and a few discrete components .
In the transmitter circuit , there are two astable multivibrators . The first , built around transistors T1 and T2 , produces a frequency of about 1.2 kHz . The second , built around transistors T3 and T4 , produces about 38 kHz . IR LED1 is used to transmit the 38kHz frequency
In the receiver circuit , TSOP1738 receives the IR signal transmitted by IR LED1 of the transmitter circuit . The output of TSOP1738 is fed to transistor T6 via diode D1 . The amplified signal is further given to relay - driver transistor T7 . Relay RL1 energises to control the toy car .
Working of the circuit is simple . Initially , when no IR beam is falling on sensor TSOP1738 , the relay remains de-energised and the toy car doesn't move . When switch SI is pressed , the IR beam falls on TSOP1738 and its output goes low , Transistor T6 cuts off and transistor T7 conducts to energise relay RL1 and move the toy car
Assemble both the circuits on separate PCBs . Enclose the transmitter PCB in a suitable cabinet , with IR LED1 affixed on the front side and switch S1 on the top of the cabinet . Keep the 9V battery inside the cabinet
Enclose the receiver PCB inside the toy car , with TSOP1738 fitted such that the transmitted IR beam directly falls on it . Fix switch S2 on the body of the car and the relay inside the car . Use a V battery to operate the toy car receiver unit.
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