TCRT5000 IR Sensor

12 May 2018 - 0 Comments

TCRT5000 IR Sensor

TCRT5000 Sensor Pinout

引脚配置

1	集电极	The collector of the phototransistor is connected to +5V
2	Emitter	The emitter of the phototransistor is grounded through a resistor
3	阳极	The Anode of photodiode is connected to +5V
4	Cathode	The Cathode of photodiode is grounded through a resistor

TCRT5000规范

IR传感器带有晶体管输出
Operating Voltage: 5V
Diode forward Current: 60mA
Output: Analog or digital data
Transistor collector current: 100mA (maximum)
Operating temperature: -25°C to +85°C

注意：TCRT5000 datasheetcan be found at the bottom of the page

TCRT5000等效

RPR220

Other IR Sensors

IR Photodiode,IR LED，qtr-1RC，TSOP, GP2Y0A21

Where to use TCRT5000

TheTCRT5000is anIR sensor unit。它既有光电二极管又有Phototransistorcoupled in its package. The photo diode has two pins (Anode and Cathode) which can be used to generate an IR signal. Similarly the Photo transistor also has two pins (Collector and Emitter) which can be used to read the IR signal that is reflected back. This sensor can be used to detect the presence of object or any other reflective surface in front it, also with some level of programming it can also calculate the distance of the object in front it. But the distance can only be calculated for short range objects and is also subjected o environmental disturbance. So if you look for a sensor to measure distance of an object in front of it you should try theHC-SR04超声传感器。

除此之外，该传感器非常适合检测其前面物体的接近度。它也可以轻松区分黑色和白色，因此在线条下广泛使用和迷宫求解机器人。

如何使用TCRT5000

TheTCRT500传感器is just a combination of a photodiode and a photo transistor. The photo diode is powered through a current limiting resistor of value 220R and the Transistor is also grounded through a 10K resistor as shown in the below picture. The transistor does not have a base pin because the biasing of the transistor is controlled by the amount of IR light it receives. So basically theIR light from the photo diodehits an object/surface and returns back to the photo transistor to bias it.

TCRT5000 IR Sensor Circuit

This sensor can either be used as an analog sensor or as a digital sensor. If we only have to detect the presence of an object then the sensor will be used as digital sensor if the distance of the object should also has to be measured then the sensor is used as a analog sensor. For either method the circuit diagram shown above will remain the same.

One major drawback of such IR sensors is that they easily get affected by environmental conditions. Like the photo transistor will not only react to the IR light from the photo diode but will also react to the IR light from Sunlight, house lightings and other commonly available sources. This problem is normally tacked by performing noise cancelation in the program. That is by controlling the photo diode itself through a GPIO pin of the MCU/MPU we can turn off the diode and check how much noise the photo transistor is reading then we can turn on the photo diode and measure the change in values by nullifying the noise that was present while the diode was turned off.