Circuit Construction

The PIC microcontroller circuit is given by my supervisor once the simulation is succeed. It was designed by Mr Mazran as a starter kit for all of the students who are supervise by him. Other than that, to make the model more useful, I have made a switch circuit in order to control the PIC microcontroller. It is infra red transmit and receive circuit which is using the basic component such as IC 555 timer for transmitter and IC 4069 as well as relay in the receiver circuit. The circuit will be function when the switch is turn on at the transmitter and the signal of infra red will be receive at the receiver. Once the signal is transmitted, the PIC microcontroller will turn on. 

Figure 1: IR Transmitter Switch Circuit

Figure 2: PIC microcontroller Circuit

Figure 3: IR Receiver Switch Circuit

Infrared remote controls are using a 32-56 kHz modulated square wave for communication. These circuits are used to transmit a 1-4 kHz digital signal (OOK modulation) through infra light (this is the maximum attainable speed, 1000-4000 bits per sec). The transmitter oscillator runs with adjustable frequency in the 32-56kHz range, and is being turned ON/OFF with the modulating signal, a TTL voltage on the MOD input. On the receiver side a photodiode takes up the signal. The integrated circuit inside the chip is sensitive only around a specified frequency in the 32-56 kHz range. The output is the demodulated digital input (but usually inverted), just what we used to drive the transmitter. When the carrier is present, this output is usually low. When no carrier is detected, the output is usually high.