Linux_C_SDK_HWT9053Modbus on board Serial port and 3 in 1 serial port

Linux_C_SDK_HWT9053Modbus Onboard serial port and 3 in1 serial port usage tutorial

https://github.com/WITMOTION/WitHighModbus_HWT9073485

Install the wiringpi library

1. Update software repositor

Command line input:

sudo apt-get update sudo apt-getpgrade

1. Install the wiringpi library

Command line input:

sudo apt-get install wiringpi

1. Check if the installation is successful

Command line input:

gpio -v

Operation steps of onboard serial port

1. View serial port mapping

Command line input:

ls -l /dev/ttyserial*

If the following two situations occur: Step 2 configuration is required

Case one：

Case two：

1. Map ttyAMA0 to serial0

Method one：

① Click on the Raspberry logo in the upper left corner -> Preferences -> Raspberry Pi Configuration

②Click "Interfaces"

③ After checking the "Serial Port option", click "OK"

That is：

④ Click "yes" to restart the Raspberry Pi

Method Two：

① Press and hold" ctrl+Alt+T" to open the terminal

② command line input：

sudo raspi-config

• The following interface appears, select "Interface Options" and press "Enter"

③ Select "I6 Serial Port" and press "Enter"

④ Select "<No>, press "Enter"

⑤ Choose"<Yes>"，press"Enter"

⑥ After the following interface appears, selec<Ok> , and then press the "Esc" key to exit the page

⑦ Reboot the Raspberry Pi

command line input：

reboot

1. Check whether the serial port is mapped successfully

ls -l /dev/serial*

As can be seen from the above figure, serial0 is mapped to ttyAMA0 after configuration, indicating that the configuration is successful.

1. Hardware connection

① Wiring problem (this example uses Raspberry Pi 3b+ as an example)

• Find the pinout diagram of the Raspberry Pi model you are using

② Wiring connection

• Prepare WitMotion sensor HWT9053-485 sensor and 485 to TTL adapter board

1. Enter the specified folder to compile and run the program

Command line input:

cd ~/linux_sdk cd ./HWT9053modbus gcc ./*.c -lwiringPi ./a.out /dev/ttyAMA0

1. View running results

• Prompt information and returned sensor parameter data appear

• Shake the sensor, the parameters of the sensor will be sent back and displayed in real time, indicating that the debugging is successful!

Operation steps of 3 in 1 serial port

1. Wiring connection

• Prepare WitMotion sensor HWT9053-485 and 3 in 1 adapter

HWT9053-485 3 in 1 adapter

VCC <----------------------------------------> VCC

A <-------------------------------------------> A

B <-------------------------------------------> B

GN <-----------------------------------------> GND

1. View the serial port file under the device file

Command line input:

ls -l /dev/ttyUSB*

Plug the 3-in-1 into the serial port of the Raspberry Pi, and enter the above command again: ls -l /dev/ttyUSB*

The extra serial port file is the serial port file we are looking for (ttyUSB0)

1. Enter the specified folder to compile and run the program

Command line input:

cd ~/linux_sdk cd ./HWT9053modbus gcc ./*.c -lwiringPi ./a.out /dev/ttyUSB0

1. View running results

• Prompt information and returned sensor parameter data appear

• Shake the sensor, the parameters of the sensor will be sent back and displayed in real time, indicating that the debugging is successful!

More

Please reference to the sensor datasheet.