08-08-2012, 04:59 PM
Infra-red Remote Control Based Motor Switch for Home Appliances
Remote Control Switch.docx (Size: 217.29 KB / Downloads: 40)
Introduction:
nfra-red (IR) Remote Control Based Motor Switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. The goal is to construct a black box where we can plug-in our 220V AC appliance and control ON and OFF operations with any modern IR remote control devices.
Modern IR remote controls generate modulated pulse train of 38 KHz frequency when any key on the remote is pressed. With the use of capacitive filtering we will convert the stream of pulses into one pulse regardless of the key entered. This way, we will be able to toggle a relay switch with any key pressed on the remote. This project has been tested with varieties of IR remote control devices like that for TV, DVD, digital camera, etc., and it worked well.
Circuit Diagram:
The 6038 IR receiver module detects the 38 KHz input pulses received from the IR remote control device. Under stand-by condition, the output pin of the IR module is at logic High, and when it detects the train of pulses, they appear at its output. The output from IR receiver is fed to the trigger input pin no. 2 of a timer IC NE555 through a PF mailer capacitor 0.01F (103j). The output pin of IR sensor goes low when it detects IR light, triggering the monostable (1-second) built around timer NE555. The output of the mono toggles the J-K flip flop (CD 4027), whose output pin no. 1 drives the relay through SL100 npn transistor (T1).
LED2, LED3, and LED4 are used to display the status of each output stage during circuit operation. Back-EMF diode D1 (IN 4007) is used for protection. Transistor T1 (SL 100) is configured as an open-collector output device to drive the relay rated at 9V DC. The circuit draws the power from voltage regulator 7805. Capacitor C5 (10F, 16V) is soldered close to the IR sensor’s pins to avoid noise and false triggering. Capacitor C3 (0.01F (103j)) and resistor R3 (100k) also avoid false triggering of monostable NE555. The monostable acts as a 1-second hysteresis unit to restrict the flip-flop from getting retriggered within one second. To activate any other 9V logic device, use the output across the relay coil terminals.
Conclusion:
Finally we have completed the circuit as mentioned above & the total circuit design is correct & also successful in operation.