Forum Diagram: remote

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Tuesday, November 4, 2014

IR Remote Control Tester

Here’s a simple, low cost, and easy to construct infrared remote control tester. The tester is built around an easily available infrared receiver module (TSOP 1238).

IR Remote Control Tester Circuit diagram:

Normally, data output pin 3 of the IR receiver module is at a high level (5 volts)and as such driver transistor T1 is in cut-off state. Whenever the IR receiver module receives a valid (modulated) infrared signal, its data output pin goes low in synchronism with the received infrared bursts. As a result, transistor T1 conducts during negative pulse period and the.LED blinks to indicate reception of signals from the remote such as TV remote control. A miniature active buzzer is connected at the collector of transistor T1 for audio indication.

The 5V DC for energizing the circuit is directly derived from the 230V AC mains supply. Unlike the conventional resistive voltage divider, a capacitive potential divider is used here, which does not radiate any heat and makes the tester quite compact. Another advantage of this tester is no false triggering due to the ambient light or electronic ballast-operated tubelights. A suggested enclosure for the circuit is shown in Fig. 2.

Saturday, October 4, 2014

Radio Remote Control using DTMF

Radio Remote Control using DTMF Schematic

Here is a circuit of a remote control unit which makes use of the radio abundance signals to ascendancy assorted electrical appliances. This alien ascendancy assemblage has 4 channels which can be calmly continued to 12. This ambit differs from agnate circuits in appearance of its artlessness and a absolutely altered abstraction of breeding the ascendancy signals. Usually alien ascendancy circuits accomplish use of bittersweet ablaze to address ascendancy signals. Their use is appropriately bound to a actual bedfast breadth and line-of-sight. However, this ambit makes use of radio abundance to address the ascendancy signals and appropriately it can be acclimated for ascendancy from about anywhere in the house.

Here we accomplish use of DTMF (dual-tone multi frequency) signals (used in telephones to punch the digits) as the ascendancy codes. The DTMF tones are acclimated for abundance accentuation of the carrier. At the receiver unit, these abundance articulate signals are intercepted to access DTMF tones at the apostle terminals. This DTMF arresting is affiliated to a DTMF-to-BCD advocate whose BCD achievement is acclimated to switch-on and switch-off assorted electrical appliances.

Tuesday, August 12, 2014

Remote controlled appliance switch circuit

Here is a versatile remote controlled appliance switch that can ON or OFF any appliance connected to it using a TV remote.

IR remote sensor IC TSOP 1738 is used for receiving the signal. Normally when no signal is falling on IC3 the output of it will be high.This makes Q1 OFF.When a signal of 38 KHz from the TV remote falls on the IC3 its output goes low.This makes Q1 conduct and a negative pulse is obtained at pin 2 of IC 1 NE 555.Due to this IC1 wired as a monostable multivibrator produces a 4 Sec long high signal at its out put.This high out put is the clock for IC 2 which is wired as a Flipflop and of , its two outputs pin 3
goes low and pin 2 goes high.The high output at pin 2 is amplified to drive the relay .For the next signal the outputs of IC2 toggles state. Result, we get a relay toggling on each press on the remote.Any appliance connected to this schema can be switched ON or OFF.

Notes .

* Before wiring the schema make sure that the carrier frequency of the
TV remote you have is 38 kHz.For that wire the sensor part only ,point your
remote to the TSOP1738 and press any switch.If out put of TSOP1738 goes
low then OK, your remote is of 38Khz type.Nothing to worry almost all TV
remote are of this type.

* You can use any switch of the remote because for any switch the code only changes,
the carrier frequency remains same.We need this carrier frequency only.

* Assemble the schema on a good quality PCB or common board.

* The appliance can be connected through NO or NC and C contacts of the relay .

* Use a regulated 6V power supply for the schema.