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How To Make A Remote Control Circuit?
IR Remote Control Schematic Design
RF Remote Control Schematic Design
IR Remote Control Schematic Design
What is Infrared remote control
Infrared remote control is a wireless, non-touch control technology with strong anti-interference ability, reliable information transmission. It has lots of beneficial features like low power consumption, low cost, easy implementation, etc. And it is widely applied in many electronic devices, especially for household appliances.
The Infrared Remote Control Block Diagram
The infrared remote control system consists of two parts, transmitting and receiving. And realized by the dedicated integrated circuit chip for coding and decoding, as shown in the following picture. The transmitting part comprises a keyboard matrix, a coded modulation, an LED infrared transmitter; the receiving part comprises an optical, electrical conversion amplifier, a demodulation, and a decoding circuit.
Key Mapping
Code Modulating
LED
Transmitting Part
Optical/Electrical Amplifier
Demodulating
Decoding
Receiving Part
3 Steps to finish the schematic design for an Infrared remote control
1. Choose the key components according to the needs, such as MCU, crystal resonator, infrared emission tube, etc.
2. Make the schematic design according to the MCU datasheet
3. Review and examine the schematic
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RF Remote Control Schematic Design
How RF Signal Transmitted
The radio waves are transverse waves, which proved by lots of practices. That means the directions of the electric and magnetic fields are perpendicular to the direction of propagation of the waves. Moreover, the direction of the electric field strength and the magnetic field strength are always perpendicular to each other.
When radio waves propagate in space, they must be affected by the atmosphere, especially the ionosphere. The main influence of the ionosphere on radio waves is that the electric wave is refracted and the energy is absorbed and attenuated. The greater the degree of ionization, the greater the attenuation; the longer the wavelength, the greater the attenuation.
How RF Signal Received
In theory, receiving and transmitting is the opposite process. First, the antenna and the electronic circuit are both operated on the same frequency of the transmitting carrier and then been demodulated and amplified to obtain the information transmitted by the originating end. The process of restoring the modulated signal is called demodulation. Demodulation is also divided into detection and frequency/phase discrimination.
The heaviest task of the receiving device is to extract useful information from the load-rated radio waves transmitted by the long-range radio transmitter.Then enter the "demodulator".
The Receiving Technical Parameters
Sensitivity is an important parameter that measures the receiver's ability to receive weak signals. It can be converted to the noise figure. Sensitivity can be expressed as voltage uV or dBuV, or power can be expressed in dBm.
5 Steps to finish the schematic design for a RF remote control
1. Choose the main components according to the needs, such as MCU, power management chip, crystal resonator, antenna, inductor, etc.
2. Apply evaluation of function and performance for the power management chip and the EVK of MCU.
3. MCU would have a recommended schematic design for references, make the design as the guide, and optimize the parameters of the MCU and the components in power management circuit;
4. Thus we are able to finish the rest functional parts of schematic design, such as voice, gyroscope, etc.
5. At last, review and publish the schematic design.
Basic RC Circuit for Transmitter and Reciever
Transmitter simple circuit
Reciever simple circuit
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