IR Remote Control Extender Circuit (Mark 3)
The IR appliance operates by utilizing an infrared (IR) carrier wave that is modulated with control signals. The modulation frequency typically ranges from 36 kHz to 38 kHz, which is commonly used in consumer electronics, although some satellite receivers may employ even higher frequencies for enhanced signal integrity and range.
The IR1 remote module is designed to receive these modulated IR signals. It incorporates a photodiode or phototransistor that detects the incoming infrared light. Once the signal is received, the module processes the signal to extract the control pulses from the modulated carrier wave. This demodulation process is crucial for interpreting the commands sent from the remote control.
In the re-transmission phase, a 555 timer IC is configured in an astable mode, which allows it to generate a continuous square wave output. The frequency of this output can be adjusted to match the modulation frequency of the original IR signal, ensuring compatibility with the receiving IR appliances. The output from the 555 timer drives an IR LED, which emits the modulated infrared light signal. This enables the re-transmission of the control signals to the targeted IR appliances, effectively allowing remote control functionality.
The circuit design may include additional components such as resistors and capacitors to stabilize the operation of the 555 timer and to set the desired frequency of operation. Proper layout and component selection are important to minimize interference and ensure reliable performance in a variety of operating conditions.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. 🔗 External reference
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