The main differences between infrared remote control and wireless remote control
2023-05-29
The infrared remote control mainly consists of two parts, namely the transmitting and receiving parts, so the transmitting end uses the well-known light-emitting infrared diode. This diode is still very different from our ordinary diodes. Its internal material is different from ordinary light-emitting diodes. When a certain voltage is applied at both ends, it emits infrared instead of visible light. Our receiving part is an infrared receiving diode.
In practical applications, it is necessary to apply a reverse bias voltage to the infrared receiving diode, which means that the infrared receiving diode is applied in the opposite direction in the circuit to achieve high sensitivity. However, due to the generally low emission power of the infrared light emitting diode and the weak signal received by the infrared receiving diode, we have used something called an infrared receiving head in recent years.
Unlike infrared receiving diodes, it has three pins, namely the power positive pole, power negative pole, and data output. So the specific working principle is as follows: when the command key is pressed, the command signal generating circuit generates the required control signal. After the control command signal is modulated by the modulation circuit, the driving circuit ultimately drives the infrared transmitter to announce the infrared remote control command signal.
When the infrared receiving device receives the infrared command signal from the transmitter, it converts the infrared light signal into an electrical signal and sends it to the preamplifier circuit for expansion. After passing through the demodulator, the signal detection circuit detects the command signal, and finally, the memory circuit and driving circuit drive the execution circuit to achieve operation.
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