Infrared Reflective Sensor

Infrared Reflective Sensor Infrared Reflective Sensor

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Primary Attribute Category: Modules, Sensors, Light {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

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Features

• Reflective Infrared Transceiver
• Features wide-range voltage comparator LM393
• Adjustable sensitivity
• Signal output indicator

Specification

• Sensor: ST188
• Power: 3.0V ~ 5.3V
• Dimension: 25mm * 15.9mm
• Mounting holes size: 2.0mm
• Voltage comparator chip: Wide voltage LM393

Pinouts

PIN	Description
DOUT	Digital data output
AOUT	Analog data output
GND	Ground
VCC	Power input (3.3V~5.3V)

Use with Pico

Configure Pico

MicroPython and C examples are provided for this sensor, to use it with Pico, you need to first flash firmware to the Pico according to the example.
Please refer to the guides of Raspberry Pi about how to flash the firmware. We recommend you use the firmware from the Demo codes archive.

• C/C++ guide of Pico
• Micropython guide of Pico

Hardware connection

Hardware Connection-Pico

Hall	Pico	Description
VCC	3.3V	Power input
GND	GND	Ground
AOUT	GP26	Analog data output
DOUT	GP22	Digital data output

Examples

Download the example

Open the terminal of Raspberry Pi and run the following command to download the example:

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/0/05/Infrared_Proximity_Sensor_Demo.7z
7z x Infrared_Proximity_Sensor_Demo.7z -o./Infrared_Proximity_Sensor_Demo
cd ~/Infrared_Proximity_Sensor_Demo
cd Pico/c/build/

C

Here we use the Raspberry Pi board to flash the Pico.

• Compile the c examples.
  • Go into the directory of C examples.

cd ~/Infrared_Proximity_Sensor_Demo/Pico/c/

• Go into the build folder and add the sdk; ../../pico-sdk is the path of the SDK, if may be different if you have saved the SDK in other paths.

cd build
export PICO_SDK_PATH=../../pico-sdk

• Generate Makefile by cmake command.

cmake ..

• Compile the codes by command make

make -j9

Note: If you use Pi zero, please run make only.

• After compiling, a uf2 file is generated.
  • Hold the button of the Pico board, and connect the Pico board to Raspberry Pi by USB cable.
  • After connecting, release the button, and a portable disk (RPI_RP2) is recognized.
  • Copy the main.uf2 file generated which locates in the build folder to the portable disk (RPI-RP2).

cp main.uf2 /media/pi/RPI-RP2/

Python examples

In Windows PC

• Hold the BOOTSET button of the PICO board, and connect the Pico board to Raspberry Pi by USB cable.
  • After connecting, release the button, and a portable disk (RPI-RP2) is recognized.
• Copy the rp2-pico-20210418-v1.15.uf2 file to the portable disk (RPI-RP2).
• Open the Thonny IDE (Please install the newest version which supports the Pico board or update).
• Choose Tools -> Options ->Interpreter, and choose the Pico and the port.

• Download the demo codes, unzip, and find the MicroPython example.
• Choose File -> Open -> Infrared_Proximity_Sensor.py and run it.

In Raspberry Pi

• Flash the uf2 file to the Pico board just like in the Windows PC.
• Open the Thonny IDE of Pi, make sure that it is the newest version, or update it.
• Choose Tools -> Options... -> Interpreter.
  • Choose Pico and the Port.

• If your Thonny IDE cannot support the Pico board, you can update it and try again.

sudo apt upgrade thonny

• Choose File -> Open... -> python/Infrared_Proximity_Sensor.py and run it.

Expected result

• The indicator of the sensor lights up when the sensor is close to the obstacle and goes off when it is away from the obstacle.
• As the distance between the sensor and the obstacle changes, the output data of the serial port changes accordingly

The examples provided are based on the STM32F103RBT6 and the STM32H743, the connection provided is based on the STM32F103RB.
If you want to use other STM32 boards, please change the connection and you may need to port the codes yourself.

Use with STM32

Hardware connection

Hardware connection-STM32

Connect to STM32F103RBT6

Hall	STM32	Description
VCC	3.3V	Power input
GND	GND	Ground
AOUT	PA6	Analog data output
DOUT	PA4	Digital data output

Examples

The examples are based on the HAL library. Please download the demo codes, unzip them and find the STM32 examples.

• Open the project from Infrared_Proximity_Sensor_Demo\STM32\STM32F103RB\MDK-ARM by Keil.
  
• Build the project and program it to the STM32 board.
• connect the UART1 of the STM32 board to the PC and check the serial data by SCCOM software.

Expected result

• The indicator of the sensor lights up when the sensor is close to the obstacle and goes off when it is away from the obstacle.
• As the distance between the sensor and the obstacle changes, the output data of the serial port changes accordingly.

The examples provided are based on the Arduino UNO, if you need to use other Arduino boards, please check if the board is compatible with the UNO.

Use with Arduino

Hardware connection

Hardware connection-Arduino

Connect to Arduino UNO

Hall	Arduino	Description
VCC	5V	Power input
GND	GND	Ground
AOUT	A0	Analog data output
DOUT	D2	Digital data output

Examples

• Please download and install Arduino IDE to your PC.
  • Arduino Website
• Download the demo codes, unzip them, and find the Arduino examples.
• Open the Infrared_Proximity_Sensor.ino file by the Arduino IDE.

• Build and upload the codes to the UNO board.
• After uploading, you can open the Serial Monitor of IDE and check the data.

Expected result

• The indicator of the sensor lights up when the sensor is close to the obstacle and goes off when it is away from the obstacle.
• As the distance between the sensor and the obstacle changes, the output data of the serial port changes accordingly.

Resources

• User Manual
• Schematic
• Demo Code
• Software

FAQ

Question:How to adjust the effective measurement distance of the infrared reflective sensor?

 Answer:

The effective measurement distance of the module can be changed by adjusting the potentiometer on the board.

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Question:What is the effective detection range of the infrared-reflective sensor?

 Answer:

It is about 5cm.

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Question: What other choices do I have?

 Answer:

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