What Is an IR Controller?

People's material and cultural living standards are increasing day by day. Various household appliances have entered millions of households. Most of them have their own remote controllers. People often look for their counterparts in order to control a certain appliance. Remote control, which brings a lot of inconvenience to people's lives. In order to solve this problem, this article proposes a design of a multi-function remote control: The remote control can have remote control functions for multiple electrical appliances through self-learning, which saves time and effort, thereby saving people from facing multiple remote controls Troubles.

Infrared remote control

People's material and cultural living standards are increasing day by day. Various household appliances have entered millions of households. Most of them have their own remote controllers. People often look for their counterparts in order to control a certain appliance. Remote control, which brings a lot of inconvenience to people's lives. In order to solve this problem, this article proposes a design of a multi-function remote control: The remote control can have remote control functions for multiple electrical appliances through self-learning, which saves time and effort, thereby saving people from facing multiple remote controls Troubles.

Chinese name

Infrared remote control

Suitable for

Coded infrared remote control household appliances

Features

Remote control of multiple home appliances

Advantages

Low cost and strong anti-interference ability

1. Suitable for coded infrared remote control household appliances;

2. Remote control of multiple household appliances;

3. With a learning / control multiplexing key, 5 ~ 10 device selection keys, 10 ~ 20 function control keys, a device selection key and each function control key jointly control one device;

4. One device selection key and each function control key can be used to learn and control common functions of multiple devices;

5. Low cost and strong anti-interference ability.

Remote control by

Infrared remote control infrared receiving circuit

Press the learning / control key to switch the CPU to the learning state. At this time, the learning status indicator D5 is lit. When a device selection key is pressed, the program adjusts the data pointer (set by the program developer) to point to the data memory. The starting unit of a data area of a specified length, when a certain control key of this remote control and a certain control key of the learned remote control are pressed simultaneously, 8031 will be controlled by the program to the P3.1 pin (ie JR terminal) outputs low level (the original initialization program set it to high level), and the level signal at the JR terminal is the control level of the NOR gate U1A. When P3.1 = 0, U1A output is the inverted signal of the input terminal. That is, the infrared receiving circuit composed of D1.U4 is responsible for receiving the signal sent by the learning remote control. When D1 has an infrared signal input, the signal is demodulated, shaped, and amplified by U4 (this decoding pulse is inverse to the original encoding pulse) Bit) is output by 7 pins, and is input to P1.4 of 8031 via IN pin in reverse via NOR gate U1A. The first high-level pulse of this signal is quickly charged to C4 (reasonably selected R3, R4 Parameter to prevent repeated triggering), at the same time, a falling edge signal is sent to the INT1 pin of 8031 through the IT pin of U2A. After the CPU responds to the interrupt, it periodically collects the U1A IN infrared coded signal from P14 to form a series of binary numbers and It is stored in the data area of the specified device and the specified key in 8-bit units (you can perform error checking by one-code continuous transmission) to complete the learning of a key. If you learn the function of other keys, the method is the same. If you want to learn the function of each key of another device, press another device selection key of this remote control, and then press each function control key respectively, so as to learn each function of the remote control being learned.

Infrared remote control infrared transmitting circuit

Press the learning / control key to switch the CPU to the control state. At the same time, the control status indicator D6 is on. At this time, if you press a device selection key, the system will be in the control state of a device, and then press a function control. When the key is pressed, the system addresses by the device number and function key number, finds the address of the data storage area corresponding to the corresponding function key of the device (the data is collected by dividing points when learning the function of the key), and reads out these data in turn. Controlled by the CPU through the P1.5 pin in order to bit-by-bit timing (time interval and sampling time interval) output to the OUT pin of the modulation circuit U2B, after modulation by the modulation circuit composed of U2B, U2C, C5.R7.R8 (Modulation frequency is 38KHZ), and then amplified by Q1, driving D4 for infrared remote control signal output, in order to achieve the control of a certain function of the selected equipment.

Overview of other circuits of infrared remote control

This part of the circuit includes learning, control and instruction circuits, data, program storage circuits, keyboard circuits, etc. The learning and control instruction circuit uses light-emitting diodes for instructions. The control signals are output from the P1.6.P1.7 pins of 8031, and then driven by the amplifier circuits to drive D5.D6 instructions. The device number display circuit uses a digital tube to display statically; The keyboard circuit adopts a query-type scanning keyboard; the program memory uses a common ROM or EEPROM, and the data memory can use a relatively inexpensive and electrically rewritable memory compatible with 6264 or 62128.

This design is only applicable to infrared remote control equipment with code division system, and does not involve infrared remote control equipment with frequency division system and infrared remote control equipment with FM signal other than 38kHz. If you want to expand these functions of the remote control, only in the infrared receiving circuit Add a frequency measurement circuit, and use a digitally controlled signal generator as the modulation circuit in the infrared transmission circuit.

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