Laser Sensor

Laser Sensor Laser Sensor

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

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Onboard Interfaces I/Os

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Overview

Specification

• Boost chip: PT1301
• Effective distance: 0.01-0.8m(typ), 1.5m(max)
• Power: 2.5V ~ 5.0V
• Dimension: 53.0mm*18.0mm
• Mounting holes size: 2.0mm

Principle: The emitting part of the laser sensor is a 180KHz oscillator emitted by an oscillator tube, amplified by a triode, the laser tube emits light, and the receiving part receives the returned light intensity from a matching 180KHz receiver tube. Since the laser sensor uses modulation processing, the receiving tube can only accept the reflected light of the same frequency, so the influence of visible light on the reflected laser can be effectively prevented.

Applications

• Obstacle detection
• Pipeline counter
• Smart robot
• Obstacle-avoiding car

Pinouts

In the case of working with a MCU:

• VCC ↔ 2.5V ~ 5.0V
• GND ↔ power supply ground
• DOUT ↔ MCU.IO (digital output)

Get Started at Pico

If you are the first time o use the Pico, you need to first learn how to get started at the Pico before you run other examples.
The Pico supports C and the Micropython which requires different firmware.
In most of the examples archives (Demo codes), we provide a Micropython firmware (uf2 file), we recommend you to use the provided firmware to test the board. Because the codes may run abnormally with different firmware.
If the board is tested to be workable, you can also download the newest firmware from Raspberry Pi and do further programming.

• If you want to use C codes, please refer to the C/C++ Guides
  • Raspberry Pi Pico C/C++ SDK
• If you want to use Micropython codes, please refer to the Micropython Guides.
  • Raspberry Pi Pico Python SDK
• The link of the newest Micropython firmware of Pico
  • Micropython firmware of Raspberry Pi Pico
• Official Guides of Raspberry Pi Pico
  • Document of Raspberry Pi Pico

Hardware Connection

Sensor	Pico	Description
VCC	3.3V	Power input
GMD	GND	Power ground
DOUT	GP22	Digital output

Download examples

Use Raspberry Pi as the host device. Open a terminal and run the following commands to download the example.

sudo apt-get install p7zip-full
cd ~
sudo wget  https://files.waveshare.com/upload/f/fd/Laser-Sensor-code.7z
7z x Laser-Sensor-code.7z -o./Laser-Sensor-code
cd ~/Laser-Sensor-code
cd Pico/c/build/

Examples

C codes

• Go into the c directory:

cd ~/Laser-Sensor-code/Pico/c/build

• Add the path of the SDK:

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

Note that if the path of your SDK is different, you need to modify the command and use the correct path to export.

• Generate Makefile and build:

cmake ..
make -j9

• After building, a uf2 file is generated.
• Press and hold the button of Pico, connect it to Raspberry Pi then release the button.
• Copy/Drag the uf2 file to the portable disk (RPI-RP2) recognized.

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

Micropython codes

Working with Windows

• 1. Press and hold the BOOTSET button on the Pico board, connect the Pico to the USB port of the computer through the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
  
• 2. Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the identified removable disk (RPI-RP2).
  
• 3. Open Thonny IDE (note: use the latest version of Thonny, otherwise there is no Pico support package, the latest version under Windows is v3.3.3).
  
• 4. Click Tools -> Settings -> Interpreter, and select Pico and the corresponding port as shown in the figure.
  

This demo provides a program:

• 5. File->Open->Laser Sensor.py, click to run, as shown below:

Working with Raspberry Pi

• Flash the Micropython firmware first.
• Open the Thonny IDE (Menu -> Programming -> Thonny Python IDE).
• 【Optiional】If the Thonny IDE in the Raspberry Pi is not the new version that supports Pico, please upgrade it first.

sudo apt upgrade thonny

• Configure Interpreter, choose Tools -> Options... -> Interpreter, choose MicroPython(Raspberry Pi Pico) and the ttyACM0 port.

• Click File -> Open.. and browser the micro python codes (Laser Sensor.py) to run the codes

Expected result

• Put an object(obstacle) in front/above the Laser sensor, the indicator of the sensor board lights, and it turns off if the object is removed.

Note: Try to avoid touching the resistors and capacitors on the board when the power is on, so as to avoid burning out the infrared emitting tube. As the laser is harmful to the eyes, DO NOT irradiate the eyes directly while using.
The STM32 examples are based on the STM32F103RBT6 and the STM32H743. The connection provided below is based on the STM32F103RB. If you need to use other STM32 boards, you may need to change the hardware connection and port the code yourself.

STM32

Hardware connection

Sensor	STM32	Description
VCC	3.3V	Power input
GND	GND	Power ground
DOUT	PA4	Digital output

Examples

The examples are developed based on the HAL libraries. Download the demo codes to your PC. Unzip and find the STM32 project from Laser-Sensor-code\STM32\STM32F103RB\MDK-ARM.

• Open the Laser Sensor.uvprojx file by Keil.
• Build and the project.
• Program the project to your STM32 board.
• Connect the UART1 of your STM32 board to the PC and check the serial data with SSCOM software.

Note: Try to avoid touching the resistors and capacitors on the board when the power is on, so as to avoid burning out the infrared emitting tube. As the laser is harmful to the eyes, DO NOT irradiate the eyes directly while using.
The Arduino example is written for the Arduino UNO. If you want to connect it to other Arduino boards, you may need to change the connection.

Arduino

Hardware connection

Sensor	Arduino	Description
VCC	5V	Power input
GND	GND	Power ground
DOUT	D2	Digital output

Install the Software

• Arduino IDE Install Steps

Run the Program

Download the program in the information we provided, unzip it, and then enter the Laser-Sensor-code/Arduino/Laser_Sensor directory.
Double-click to open the Laser_Sensor.ino file.
Select your development board and the corresponding port.

Compile and download, as shown below:
After the download is successful, run SSCOM to connect the Laser module, and you can view the status of the sensor in real-time.

Note

Place the obstacle above the laser sensor, and the signal indicator on the module will be on. When the obstacle is far away from the laser sensor, the signal indicator on the module will be off.
Note: Try to avoid touching the resistors and capacitors on the board when the power is on, to avoid burning out the infrared emitting tube, the laser is harmful to the human eyes, please do not use it to irradiate the human eyes!

Resources

• Schematic
• Demo Code
• Software
• SSCOM Serial Assistant

FAQ

Question:Can the laser sensor be applied to distance measurement?

 Answer:

No, the laser sensor can only be applied to obstacle detection.

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Question:Does the laser sensor output analog data?

 Answer:

No, it outputs digital data formed by‘0’or/and‘1'.

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Question:What is the optical wavelength emitted by the laser tube?

 Answer:

The optical wavelength emitted is 650nm.

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Question:What kind of light source can the receiving tube identify?

 Answer:

It can identify the modulated visible light (650--950nm).

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Question:What is the operating current of the laser sensor?

 Answer:

The operating current is about 40mA at an operating voltage of 3.3V.

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Question:What is the purpose of the transistor next to the laser tube?

 Answer:

That is the modulation tube, the laser modulated into a certain frequency to send, there is a receiver tube under the lens for receiving a fixed frequency of light.

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Question:What is the range of the Laser sensor?

 Answer:

The range is 0.8M.

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Question:What other choices do I have?

 Answer:

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