Product Application

Receiving, after being processed by the comparator circuit, the signal output interface outputs a digital signal (a low-level signal), which can be adjusted for detection distance through a potentiometer knob. The effective distance range is 2-60cm, and the working voltage is 3.3V-5V. The detection distance of this sensor can be adjusted by a potentiometer, and it has the characteristics of low interference, easy assembly, and convenient use. It can be widely used in many occasions such as robot obstacle avoidance, obstacle avoidance carts, assembly line counting, and black and white line tracking.

Product Parameters

When the module detects an obstacle signal ahead, the red indicator light on the circuit board is high, and the OUT port continues to output a low-level signal. The module detects a distance of 2~60cm and a detection angle of 35 °. The detection distance can be adjusted through a potentiometer. Clockwise adjustment of the potentiometer increases the detection distance; Turn the potentiometer counterclockwise to reduce the detection distance.

The sensor belongs to infrared reflection detection, so the reflectivity and shape of the target are the key to the detection distance. Among them, black has the smallest detection distance and white has the largest; Small objects have smaller distances, while large objects have larger distances.

The output port OUT of the sensor module can be directly connected to the 10 port microcontroller, or it can directly drive a 5V maintenance module or buzzer module; Connection method: VCC-VCC; GND-GND:OUT-IO.

The comparator adopts LM339, which works stably;

The module can be powered by a 3.3V-5V DC power supply. When the power is turned on, the red power indicator light is high;

Product Description

The infrared probe VCC GND OUT is connected to the central control board VCC GNDINx

Central control board power supply: VCC external voltage of 3.3V-5V is connected to the 6P pin interface of module (can be directly connected to 5V microcontroller and 3.3V microcontroller); GND external connection GND; OUT1-OUT4 connected to microcontroller IO port

Output signal: TL level (can be directly connected to the V0 port of the microcontroller. When the infrared light reflected back by the sensor is sensed, the corresponding red indicator light will light up and output a low level; when there is no infrared light reflected back, the indicator light will not light up and output a high level (high level is equal to the power supply voltage))

Product Instructions

Test probe: Move away all objects in front of the probe, and do not point the probe towards a place with sunlight (light can cause significant interference to the probe). Connect the probe board to the power supply and use a multimeter to measure the voltage between OUT and GND. The normal range should be between 0.6V-2.5V. Cover the probe with white paper and use a multimeter to measure the voltage between OUT and GND. The normal range should be close to OV. Simply put, after covering the probe with white paper, there will be a significant decrease in voltage between OUT and GND, which is considered normal.

Testing the central control board separately: This requires first understanding the working principle of LM339. Let's briefly explain the first step: IN1- is the voltage input terminal regulated by the locator, IN1+is the voltage output by the probe (i.e. the voltage between the probe OUT and GND). When IN1- voltage>IN1+voltage, the corresponding output voltage of OUT1 is close to 0V, and at this time, the corresponding LED light will light up; When IN1- voltage<IN1+voltage, the corresponding OUT1

When the output voltage is close to 5V, the corresponding LED light will light up. This is the core of the entire circuit operation. Based on this principle, we can conduct a simple test by adjusting the potentiometer of the first circuit to make the voltage of IN - around 2.5V. Then, according to the above principle, connect IN1 to 0V and 5V voltages respectively. Based on the above principle, we will find that when connected to OV, the LED light will light up; When connected to 5V, the LED light goes out.

Online testing: Connect the probe to the central control board according to the requirements, move away all objects in front of the probe, and do not point the probe to a place with sunlight (light can cause significant interference to the probe). Adjust the potentiometers of each circuit until the light just goes out. Then cover the probe with self paper and the LED will light up. This way, the test is considered successful. Then we can transmit the output signal of the central control board to the microcontroller for high and low level detection.

Product Special note

1. Connect the wires according to the diagram, do not connect them incorrectly

2. This document only represents the product parameters at the time of editing. Any changes in the future will not be notified separately

3. Do not point the probe towards the sun, as the light may interfere with the module

4. The larger the reflection distance of the module, the more likely it is to trigger incorrectly

5. Sensitivity is difficult to adjust too high, which can easily trigger by mistake

6. Sometimes there may be a slight brightness of the IED light, which is not triggered and the output terminal is still outputting a high level. It can be measured with a multimeter without affecting its use

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