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Now a day, everyone wants to control their appliance wirelessly (i.e. remote control). Here is a simple tested and inexpensive remote control switch utilizing reading available components.   Circuit Description of infrared (IR) remote control switch As in all wireless systems Infrared (IR) remote control switch also comprise two major section i.e. transmitter and receiver section. Transmitter Section: – The logic of this section is simple and is build around most versatile IC NE555 (IC 1 ), configured as astable multivibrator to produce frequency about 38 KHz. This is so, because IR module receiver used here works in range of 38 KHz frequency. Timing component of infrared remote control switch is resistor R 1 and R 2 and capacitor C 2 , determine the range of oscillating. Where, formula of generated frequency (F) from transmitter section IR remote is given by F = 1.443 / (R 1 + 2R 2 ) C2 The output frequency from pin 3 of IC 1 is fed to base of transistor T 1 through resistor ...

INFRARED TRANSMITTER USING 555 Timer Here i am going to explain INFRARED TRANSMITTER USING 555 Timer. I think you already know the applications of INFRARED RAYS, we can't see them directly with our eyes. The timer NE555 is used here as an ASTABLE MULTIVIBRATOR , which will generate non sinusoidal (square) output waves. The 555 timer is the core part of this circuit. The output from pin3 is given directly to the IR LED with the help of current limiting Resistor. IR LED looks almost similar to an ordinary LED. And it is cheap. FREQUENCY DETERMINATION OF INFRARED TRANSMITTER CIRCUIT The frequency of this circuit is determined by the value of Resistors R1, R2 and the capacitor C. For normal purposes the IR frequency is about 38Khz. To generate an INFRARED ray with frequency 38khz you have to select the values of R1, R2, and C as follows. R1- 150K R2- 1.5K C- 0.01μF You can use our ASTABLE MULTIVIBRATOR Frequency Calculator tool to determine the value of R1, R2 and C CIRCUIT DIAGRAM OF...

What is PIR ? Passive Infrared Sensor Circuit Diagram . Detectors or pyroelectric sensors, passive infrared or PIR sensor, are made of a crystalline material that generates an electric charge on the surface when exposed to heat in the form of infrared radiation. When radiation increases the amount of electrical charge increases too and this load is measured with a sensitive FET transistor which is inside the sensor module. With the RIP is commonly used as a motion detector of an object by detecting the infrared signal radiated from the object (people and animals). The Passive Infrared Sensors are also used in remote thermometers. Pinning PIR sensor Pin 1 of the PIR must be connected to the positive supply 5V DC. Pin 2 is the output of PIR sensor, it must have a connection to the earth through a resistor of 47K to 100K (depending on the circuit). Pin 3 of the RIP must be connected to ground or negative circuit. Simple Circuit Diagram using PIR Sensor Simple circuit motion sensor PIR det...

This circuit is one of the most basic and popular sensor modules. In electronics, this sensor is analogous to human’s visionary senses which can be used to detect an obstacle which is one of its common applications. In robotics, a group of such modules are used so that a robot can follow a line pattern. The transmitter part of the sensor is an Infrared (IR) Led which transmits continuous IR rays to be received by an IR receiver. The output of the receiver varies depending upon its reception of IR rays. Since this variation cannot be analyzed as such, therefore this output can be fed to a comparator. Here operational amplifier (op-amp) of LM 339 is used as comparator. When the IR receiver does not receive signal the potential at the inverting input goes higher than that that at non-inverting input of the comparator (LM 339). Thus the output of the comparator goes low and the LED does not glow .When the IR receiver receives signal the potential at the inverting input goes low. Thus ...