Remote Control

The transmitter is shown and although straightforward, there are a couple of tricks that I had to incorporate to minimise battery drain during standby. Although the PIC quiescent current is only 200uA, that will still flatten a pair of AA or AAA 1.5V cells over time. The receiver provides motor drive (forward and reverse) for the motorised pot, and a relay for muting. The relay simply shorts out the preamp's output - this will not cause any damage to the preamp, as long as.....

A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project. A compact 9-volt PP3 battery can be used with the transmitter. It can transmit signals up to 15 metres without any aerial. The operating frequency of the transmitter is 300 MHz......

The second half controls the steering. The mechanical design is a 3 wheeled caddy with the ´single wheel´ actually a closely spaced pair of wheels which are driven by the main drive motor top provide motive power (this is the motor controlled by the first circuit). However the pair are on a motorised swivel arrangement: this second motor is the steering and can rotate the pair through 180 degrees, thus providing not only the steering but also the direction control...

I have seen these devices advertised in magazines, they sell for around £40-£50 and use radio to transmit between receiver and transmitter. This version costs under £5 to make and uses a cable connection between receiver and transmitter. For example, if you have a bedroom TV set that is wired to the video or satellite in another room, then you can change channels on the remote satellite receiver using this circuit...

When a remote control signal is received, the energy stored in C2 drives the emitter diode. At the same time, Q1 switches on briefly to allow the battery to recharge C2. The green LED shows that the circuit is transmitting; and the yellow LED confirms that C2 has been topped-up. There is unwanted IR radiation in both daylight and tungsten lighting...

Briefly it`s an Infrared receiver which communicated with your pc to command many windows application, so once you have built the interface, programmed the pic16f84 with the code and connected everything to your serial com2 you`ll be able to command your pc applications through your TV or VCR remote !..

By using Fujitsu (Japan) "IR-Commander" or "Crossam2+ ( Japan ) ", you get high reliability computerized home control environment. IR Commander is a multi-function adapter that supported IrDA / ASK / 24 feet 360 degree TV-Remote. Crossam2+ is the remotes which equipped RS-232. I recommend above two devices. Another selection, use Actisys ACT-IR200L. ACT-IR200L has TV-Remote function, It isn`t known generally. RemoconCon use this TV-Remote function...

The circuit above illustrates using the IR receiver module along with a PIC12F629 microcontroller to decode 5 individual IR remote control keys so the circuit will only toggle one of the 4 outputs when a particular key is pressed. The 5th key is assigned to the master clear function that toggles off the 4 outputs. Works with most hand held IR remote controls that send a single data stream. However, some remotes send multiple groups of data and only the.....

The remote control receiver is a custom design based on a pre-built 433MHz UHF radio receiver, a decoder chip and a BASIC Stamp. The Stamp is expensive, but easy to work with. The receiver requires 8.5mA, plus 1.5mA for each LED (individual or segment) that is lit for a maximum of up to 23mA. In practice it is between 13 and 16mA. Pressing a button on the remote transmitter causes the receiver to consume an extra 0.2mA. In the `power saving` mode the PBASIC `nap`.....

As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is used in the differential mode to amplify the pulses of current from the photodiode. LED1 is an ordinary coloured led which will light when IR radiation is being received...

Here is a handy gadget for test- ing of infrared (IR) based re- mote control transmitters used for TVs and VCRs etc. The IR signals from a remote control transmitter are sensed by the IR sensor module in the tester and its output at pin 2 goes low. This in turn switches on transistor T1 and causes LED1 to blink. At the same time, the buzzer beeps at the same rate as the incoming signals from the remote control transmitter...

This circuit lets you control any line powered electrical device (a lamp, television, fan, etc.) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With this circuit, you can put them back into use. The circuit looks for any modulated IR source and uses it to control a TRIAC, which then switches any appliance connected to it's socket. For example, you can use it to.....

The remote control transmits encoded signals. Each time a key is pressed, the relevant code is transmitted, usually repeating it many times to ensure reception. This encoded signals travels over a radio or infrared-light beam, to eventually get captured by the receiver. The receiver includes a sensitive circuit capable to transform those weak radio-clicks or infrared flashes in an electric signals with only two logic levels, zero and ones. The logic levels appear as train.....

The circuit in Figure 1 acts as a latching solid-state relay. A short application of a magnetic field in the vicinity of S1 toggles the relay on and off. The relay switches power from a 3V battery at load currents as high as 10 mA. This remote switch is ideal for battery-powered applications. In the off state, the circuit draws no current; in the on state, the circuit draws only 100 µA. All the parts are inexpensive and readily available...

This project will explain how you can build a receiver for 35MHz. The receiver is based on the FM receiver circuit MC3371, and the frequency is PLL controlled with LMX2306 circuit. In this project I will build a radio receiver for RC air planes. There are 20 different frequencies (channels) used for radio controlling RC air planes. Each user needs it own frequency, else you will controll someone else plane. The lowest frequency is 35.010MHz and the highest is 35.200MHz. In.....

This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the counting on three 7-segment LED displays. The least significant digit displays tenths of degree and then a 00.0 to 99.9.....

Momentary output : One of the relays RE1...RE4 is ON as long as CH1---CH4 is pressed from transmitter. Latch output: when one of channels CH1...CH4 is pressed from transmitter RE1...RE4 are ON as long as other CH is pressed from transmitter. Valid transmission indicator: LED is always on when reciever recieves valid data...

The circuit consists of ordinary components (except of ATtiny13 in some cases). The IC1 is an infrared receiver at 30 kHz. The T2 makes the switch On/Off of Media Center when it gets a High level by IC2. The K2 is connected at the "power switch" connector of your PC's mainboard (motherboard). The two diodes are put to make the connection of K2 to the mainboard, easy. You don't have to worry about which polarity you have to connect this connector to the mainboard. Connect.....

IR appliances use pulses (control signals) sent over a modulated IR carrier wave. The carrier wave may be modulated at various frequencies, 36-38KHz being the most popular.Some Satellite receivers use even higher frequencies than this. The IR1 remote module receives an infra red signal and separates control pulses from the modulation. To re-transmit, a 555 timer is configured as an astable oscillator...

This infrared remote control timer can be used to turn an appliance on/off for a period of 0.11 second to 110.0 seconds. The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig. 1 shows the IR transmitter section. The astable multivibrator NE555 (IC1) is used to generate a 10kHz modulated IR signal...