Infrared remote control electric fan circuit

This article introduces a full-featured infrared remote control electric fan circuit, which has three functions: normal wind, natural wind, and sleep wind. It controls automatic shaking of the head, 05 to 75 hours timed off function, and also has an independent nighttime function. Low-light lighting is easy to make and easy to use. Circuit principle: The receiving circuit is shown in Figure 1. From the circuit diagram, we can see that its core component is a device that integrates infrared receiving amplification, decoding, automatic control, manual operation, LED light-emitting tube working status indication, and timer shutdown indication setting. integrated circuit. This circuit has fewer peripheral components, is very simple, and is easy to install. 220F, D1, R1, R2 reduce the voltage and limit the current. The +5V DC formed by the voltage regulation of D2, D3, C2 and D4 is supplied to the pins and pins of IC1 (BA8206) and the infrared receiver (AX889W). Pin 2 of the infrared receiver transmits the signal from the infrared receiver to pin 2 of IC1, which is decoded to control various actions. Every time a function is operated, a HD (22mm piezoelectric buzzer) will sound to remind the operation. The printed circuit board is shown in Figure 2 (omitted in this article). Operation instructions: A1 ~ A5 are manual micro touch switches on the receiving board respectively. A1 is the shutdown switch. It can cut off the fan function, shake the head and the set shutdown time of 0.5 to 7.5 hours, and can remember the shutdown. The previous operating mode is used, but the timing mode and sleep mode are not memorized, and the lights cannot be turned on or off. A2 is the setting switch for timer shutdown. Each time you press it, you can set the cumulative timing of 05, 1, 2, and 4 hours respectively, and the corresponding light-emitting diodes will indicate the progress of the time. The maximum can be set to 7 5 hours. A3 is the switch for power on and fan speed adjustment. A4 is the fan rocker switch. A5 is the colored light switch. Its on and off operation is independent of the control of the A3 switch. Infrared remote control: The circuit schematic diagram is shown in Figure 3. It is composed of an encoder (BA5104) and an infrared transmitter circuit. The remote control command sent by the corresponding switch is output from the pin to Q1, which is amplified and then drives D1 to send out the encoded infrared remote control signal. The remote control consists of six keys. In addition to the five control function keys on the receiving circuit board, a wind key is added. Press this key to change the fan from normal wind - natural wind - sleep wind - normal wind. Mode cycle (there is no wind type key on the receiving board. If you need to add more, you can connect a switch between pin 6 of IC1 and the common terminals of A1, A2, and A3 to realize manual operation to change the wind type mode), Since the remote control uses AA batteries and is smaller in size, the printed circuit board diagram is shown in Figure 4 (omitted in this article). Circuit installation and maintenance: The receiving circuit printed circuit board is shown in Figure 2 (omitted in this article). The following points should be noted when selecting components: (1) F is the 1A fuse and cannot be omitted. (2) The power of R2 and R3 should be no less than 3W, and they should be installed far away from other components and suspended in the air to ensure their heat dissipation space. (3) A1~A5 should use small tact switches. (4) Q1~Q5 can use bidirectional thyristor 1A/400V. (5) Other resistors and capacitors can be used with low power according to the circuit parameters. (6) It should be noted that the window of the infrared receiver should maintain sufficient receiving space. The vulnerable parts in the receiving circuit are mainly F, R2 and R3, D1, D4, C5, Q1~Q4. Once the fan coil is short-circuited or the rotor is stuck, these components may be burned. When the remote control function fails, you should first check whether F is burned out and whether A1~A5 on the operating receiving board work. Secondly, you should check whether there is +5V between the pins of IC1 and IC1. If not, check whether C1 and C2 have broken down. , measure whether the two ends of D2 and D3 are 3.3V or broken down, whether the infrared receiver (DY1) has output, etc. Under normal circumstances, IC1 will not be damaged. Among the remote control transmitters, the A1 and A2 switches are most susceptible to damage. Once the remote control distance becomes shorter or fails, you should first check whether the battery is used up, and then check D1, Q1, C1, C2, C3, Z1, etc.