In this post we learn how to connect a TSOP series infrared sensor and use it for a specified IR remote control operations. All the above TSOP variants have identical features and characteristics except their center working frequency, which may typically range between 30 kHz to 60 khZ. The curved lens which can be seen over the central portion of sensor body is where the infrared signal from a remote control handset is focused for enabling the TSOP to initiate its sensing operations. So please verify the pinout sequence if you are using a different variant of the IC. The shown wire connections are for indicative purpose only, these could be in practice connected through PCB tracks. This level is maintained, as long as an input infrared signal is not pointed or is focused towards the lens of the TSOP When an IR Signal is Applied In the above diagram we can see IR signal frequency being applied and approaching the lens of the TSOP, until it touches the lens of the sensor.
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It has one input and output which only acts on the base of the input IR signal. Every IR receiver has a special frequency to operate. It uses silicon-based technology, which works at the microlevel and very sensitive and efficient to its functions. It has only three pins that connect TSOP with other devices and make it useful for wireless communication. As shown in the figure below: Pinout Description GND: The ground pin is only to make common ground with other devices, especially microcontrollers and ICs.
The power should be according to its specification and should be only at power pin. In case of power input on any pin even if its low the IC will start heat up which can be noticed by touching it. In the end, heating will damage the TSOP. Output: The data will come out in the form of the pulse from the output pin. Output data will be in voltage form, from the TSOP. Special frequency level makes it operate with a specific device.
TSOP has an internal bandpass filter to avoid any ambient light especially sunlight. Even there are multiple features in a single package the IC still, has low power consumption and the power consumption only happens when it is operating. At stand by position, the power consumption becomes lower.
It is an active low output device. The output voltage and current will always be according to the power input. How does the IR receiver work?
The given image is a general block diagram of the internal components of TSOP The detail of every component is discussed below: TSOP Block Diagram AGC As from the block diagram the internal components can be seen clearly but here the use of each component is a reason. AGC amplifies the input of different types of input signals from the IR receiver. The AGC then passes the output towards the Bandpass filter.
It first converts the incoming analog signals to digital output levels which then pass towards the demodulator. The combination of AGC and bandpass also makes it avoid any ambient light especially the sunlight because it is common and can be found anywhere easily. The device may have internal sunlight protection but still, the company recommends it to use at a shorter distance. The change in weather may sometimes affect the sunlight which can affect the transmission with TSOP.
The bandpass filter also makes the IC operate only at a special frequency which is 38KHz. The output data from the bandpass filter will be entered in the demodulator which will drive the NPN transistor using low input signals. NPN transistor is directly connected to the power and output from the collector and with the ground from the emitter side.
Every low signal will turn off the NPN transistor and power will be pass towards the output pin. Control Circuit The control circuit act as a switch for demodulator and band filter. It generates the output signal whenever the bandpass filter generates the output, the control circuit generates the output signal which tells the demodulator and AGC about completion of filtration. Security systems like object detection use it with the IR transmitter. TSOP use in Line following robots to achieve its goal.
It is one of the best receivers for a small distance communication but it is only for one-way communication. Especially at the commercial level, the TSOP use to make wireless communication to avoid any kind of interaction between humans and machines due to many issues, mostly safety.
In most of the local shops, they have a remote tester that has TSOP within itself, which helps to read the incoming signal. The basic purpose of this device is to view the incoming signal from the remote. The signal coming from remote is unable to see with the naked eye. The following circuit helps the vendors to view the remote signals in the form of light. The blink of LED will be according to the incoming signal and can be viewed by the human eye easily.
This diagram shows an IR receiver interfacing with Arduino. For working and code check this complete article and video:.
How to Connect a TSOP1738 IR Sensor
TSOP1738 IR Receiver
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