Infrared integrated receiver, does the signal have to be modulated?

There will definitely be a signal in the receiver head, but you can't identify the signal that comes out, and any kind of integrated transceiver has its own modulation rules. An integrated receiver is not just a collection of discrete devices together. You have made your own transmitter circuit at the transmitter end, and you can also build your own receiver circuit at the receiver end.

If your signal is not modulated, you are the only one who can identify what exactly is being sent.

No, but you can do it directly with a photodiode and a receiver circuit. After the current is amplified by the triode, a judgment circuit is made to judge the high and low levels. In addition, the signal that comes out in this way is that the light is high, and the light is low, and then add an NAND gate.

The photodiode is light and current, and the current intensity is basically proportional to the light intensity. However, note that there is also an electric current when there is no light, and this current is called dark current.

It has nothing to do with the positive or negative voltage of the diode.

The photosensitive tube and the mediation IC package are integrated into an all-in-one IR receiver. The internal circuitry includes infrared photodiodes, amplifiers, limiters, bandpass filters, integration circuits, comparators, etc. The infrared photodiode monitors the infrared signal and sends the signal to the amplifier and limiter, which controls the pulse amplitude at a certain level, regardless of the distance between the infrared transmitter and the receiver.

Its main functions include amplification, frequency selection, and demodulation, and the input signal must be the signal that has been modulated. After its reception, amplification, and demodulation, the original signal is output directly at the output. So that the circuit can be simplified!

The sensitivity and anti-interference are very good, and it can be said to be an ideal device for receiving infrared signals.

The commonly used infrared emitting tube has 30, front tremor, etc., this angle refers to the half angle of the wisdom defeat, and the model is generally marked behind.

According to what you said about the situation that you can't receive if you deviate from 10 degrees, it shouldn't be these degrees, it may be smaller, within 10 degrees. But this angle is rare, so I don't know if you bought this kind of one. If the angle of the transmitter tube you use is relatively large, the power of the transmitter tube needs to be relatively large, so choose a chip made of 12mil or 14mil, the premise is that you want to ensure that the transmitter tube is 940 wavelength.

If it's an 850, the receiver may not receive it. The more suitable models are L5IR5-45 and L5IR4-45

Let's talk about the reception aspect. Generally, the receiver is 38kHz, and you must be sure that you are emitting infrared signals at this frequency. When the light is turned on, the receiver cannot receive the infrared signal because the infrared sensing element has received the infrared light of the lamp and is saturated, so it no longer receives the signal from the emitting tube.

It is recommended to use an infrared receiver with good anti-light interference, such as W0038HL-26.

Of course, there are other possible reasons.

The infrared receiver head (also known as the infrared receiver module, IRM) is an IC module that integrates an infrared receiver tube, amplification, filtering, and comparator output.

There are many types of infrared receivers, and the pin definitions are also different, generally there are three pins, including power supply pin, ground pin and signal output pin. According to the different modulation carriers at the transmitter end, the receiver head with the corresponding demodulation frequency should be selected.

1. Receiver: It adopts small design and internal shielding module package, which can do infrared decoding experiments, infrared remote control, etc.

Cooperate with the remote control to complete remote control decoding and infrared remote control experiments.

Metal encapsulated. Infrared receiver tube.

It is suitable for all kinds of automatic control instruments and sensors for photoelectric conversion.

Signal light source for various types of photodetectors.

Depending on the driving method, stable light can be obtained.

Pulsed light, slow-varying light.

It is often used in control, alarm, etc.

Holding points; It adopts the structural form of reflection function, strong optical power, low driving voltage, and is easy to match with transistor circuits.

The structure is strong and earthquake-resistant.

High reliability. Metal-glass encapsulated devices, with good wear and temperature resistance.

It is widely used as a receiving element in infrared remote control systems.

1. Audio-visual equipment.

2. Air conditioners, electric fans, lights, etc.

3. Infrared remote control;

2. Infrared light-emitting diode is: color TV, video recorder, DVD player, audio device, air conditioner and other indispensable electronic devices in infrared remote control system, which transforms the pulse coding remote control command electrical signal into a 940mm infrared light modulated wave remote control signal and radiates it in space, the quality of its performance and the normal working state are directly related to the sensitivity, directivity, reliability and other work quality of the remote control system;

The hardness of the infrared light-emitting diode packaging material is lower, its high temperature resistance is worse, in order to avoid damage, the solder joint should be far away from the root of the pin during the day, the soldering temperature should not be too high, the soldering time should not be too long, it is best to use metal tweezers to clamp the root of the pin to help heat dissipation.

The shaping of the pin bending switch should be completed before welding, and the pipe body and pins should not be stressed during welding.

After reading the above by the infrared receiver manufacturer.

1: Yes, it integrates receiving, filtering, and decoding.

2: If you want to build your own chemistry, you need to use a specific chip for decoding 3: No, the general is 38k, and 39k, 40k, etc. 4: the receiving head is three-pinned, which can be used to realize byte communication through the carrier, and the receiving tube is two-pinned to identify high and low levels.

Small design;

Built-in dedicated IC;

Wide-angle and long-range reception;

Strong resistance to dry flexure;

Able to resist the environment and scratch the light;

Low voltage operation; Photoelectric parameters (t=25 VCC=5V F0=38kHz): Parameter symbol Test conditions min type max unit Operating voltage VCC V Operating current ICC - MA quiescent current ICE When there is no signal input, MA Receiving distance L 15 18 m Receiving angle 1 2 + -35 deg Carrier frequency F0 kHz BMP width FBW -3dB bandwidth - 8 - kHz Low level output Vol Vin=0V VCC=5V V High Output VOH VCC=5V VCC V Output Pulse.

Width TPWL VIN = 50MVP - P 500 600 700 S TPWH VIN = 50MVP - P 540 640 740 S Infrared receiver head There should be a filter to filter out the white light. Under the following environmental conditions, the infrared receiver head can affect reception, even severely:

1. The strong light is directly connected to the infrared receiver, resulting in the saturation of the photosensitive tube. The white light mid-infrared component is also very strong.

2. There is a strong infrared heat source.

3. There is a strobe light source, such as a fluorescent lamp.

4. Strong electromagnetic interference, such as fluorescent lamp start, motor start, etc. 1).Storage and use in an environment without any applied pressure or affecting quality;

2).Storage and use in an environment free of polluting gases or sea breeze (containing salt);

3).Storage and use in a low-humidity environment;

4).Weld the lead pins under the specified conditions, and do not apply external force after welding;

5).Do not clean this product, before use, please use an electrostatic belt to connect the operator and the electric soldering iron to the floor line;

6).Please be careful to protect the receiving surface of the infrared receiver, as it will affect the reception effect if it is stained or worn, and do not touch the surface.

7).When choosing an infrared receiver, it is necessary to distinguish its manufacturing process, mainly including glue filling process and stamping process. Among them, the production process of glue filling is relatively simple compared with that of lamination. Therefore, it is inferior to the receiving head of the laminating process in terms of anti-interference.

1. Mixing phenomenon, when there is fragmentation and swimming, due to the mismatch between the receiving IC chip and the decoding IC used by the customer, a large number of non-functional or close phenomena are caused.

2.Caused by a customer change in the program or a program update.

3.When the customer welds, the electrochrome ferrochrome cavity silver temperature is too high or the welding time is too long, and the small product is more prominent.

4.During the production line test, due to the wrong cut of the production volume, the QA was not drawn.

5.The product is not aging and shipped.

6.Changes in the customer's usage environment.

7.The remote control does not work or the battery does not have enough power.