Irx1 tsop1738 pdf
When any TV remote key is pressed, IR rays fall on the TSOP1738 and its output goes low At the same time relay RL2 energises for a few seconds through pnp transistor T2 (BC558). The receiver IC TSOP1738 receives the light pulses from the remote (corresponding to the particular button or the number pressed) and converts it into electrical pulses.
In the diagram shown here, normally the output of IC1 is low and green LED2 is on and the red LED3 off. This indicates that the circuit is ready for use. The circuit is connected to any of the home appliances to make the appliance turn on/off from a VCD, VCR, Air Conditioner or DVD remote control. The circuit works on regulated 5V, which is derived from X1 and regulated by IC1. Home appliance is controlled either by pressing any key on the remote or by manually pressing switch S1 to ‘on’ state. The circuit can be triggered from up to 10 meters. It's the brand's brightest bulb yet with a 1600 lumen output. The circuit consists of a step-down transformer X1 (6V-0-6V, 250mA secondary), 5V regulator 7805 (IC1), two 5V, 1 change-over (C/O) relay, a timer NE555 IC (IC2), an IR receiver module (IRX1 TSOP1738) and some discrete components.
You can switch on LED using TV Remote with this circuit. Whenever you press a button of the remote, TSOP1738 (IRX1) receives IR signals automatically and feeds it to Port3 pin P3.0 of AT89C2051.
The controller receives the sequence of IR pulses and finds out when a button is pressed with the help of Assembly language program in the MCU. You can change tubes to vary the preamplifier gain. The circuit can be operated up to a distance of 5-10 metre depending on the remote used. The receiver output is given to the microcontroller, which is programmed to decode the pulses for the required number (button).