IR Remote Control Switch Using CD4015 IC

This circuit was designed around IR sensor module, NE555 timer and CD4015 4-bit shift register. You can use any IR sensor module commonly used in TVs and radios. So the same remote controller can be used to control this.

         Here is the circuit diagram.

In response to the IR signal received by the IR sensor module, it outputs a digital signal. It is a train of pulses. As it is not a constant impulse, it can not be used directly to control a target circuit such as a relay. NE555 timer has been set as a mono-stable multi vibrator to get a constant impulse of ~500ms duration in response to the digital signal received from the IR sensor module. Due to this reason, once triggered, NE555 can not be re-triggered for ~500ms duration.

CD4015 4-bit shift register is working as a bi-stable multi vibrator(Flip-Flop). Impulse

received by the pin no:1 can change the state of the flip-flop. A special circuitry included here resets the circuit at the time of  power on. So at the time of power on, the relay is always kept off, certifying the reliability. When the relay is in the power off state, an LED will light to indicate the standby mode.

This was designed and tested by me and found to have no errors.