RPI User Guides

Enable I2C Interface

Open a terminal and run the following commands：

sudo raspi-config 
Choose Interfacing Options -> I2C ->yes 

Reboot Raspberry Pi：

sudo reboot

Install Libraries

• Install BCM2835 libraries

wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz 
cd bcm2835-1.71/
sudo ./configure
sudo make
sudo make check
sudo make install
#For more details, please refer to http://www.airspayce.com/mikem/bcm2835/

• Install WiringPi libraries

sudo apt-get install wiringpi

#For Pi 4, you need to update it：
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
#You will get 2.52 information if you install it correctly

Download Examples

Open Raspberry Pi termianl and run the following commands to download the examples：

sudo apt-get install p7zip-full -y
sudo wget  https://www.waveshare.com/w/upload/b/b8/AW9523B-IO-Expansion-Board-Code.7z
7z x AW9523B-IO-Expansion-Board-Code.7z -O./AW9523B-IO-Expansion-Board-Code
cd AW9523B-IO-Expansion-Board-Code/RaspberryPi/

Hardware connection

Test the example

Please first negative to 'AW9523B-IO-Expansion-Board-Code/RaspberryPi/' directly by cd command before you run the codes;；

C codes

• Compile the codes and run it
  

cd C
sudo make clean
sudo make 
sudo ./main

The examples use interrupt by default, if you want to disable the interrupt function, please add the following lines to /boot/config.txt, it will set the gpio23 to pull-up mode.

gpio=23=pu

python

Run the following commands:

cd python
sudo python AW9523B.py

Expected result

Connect the PAx pin to PBx pin, for example, connect PA0 to PB0 by cables. The PAx pins are set as output, and PBx are set as input. The status of PAx pins output toggle every 550ms in order like water lamp, every time the PAx pins toggle, it all cause the PBx pin to interrupt and printed the status to the terminal.

Arduino User Guides

The provided examples and hardware connections are based on Arduino UNO R3. For other Arduino boards, you may need to modify the connection or codes

Hardware Connection

You can connect the board according to the table

Install Arduino IDE（Windows）

arduino IDE Installation Guides

Run the Codes

Download the examples from Demo codes， unzip the archive, and enter the AW9523B-IO-Expansion-Board-Code directory. Copy the AW9523B-Arduino-Library folder to the libraries directory which is under the installation path, generally, the path is C:\Program Files (x86)\Arduino\libraries
Open the Arduino IDE software, Tools choose UNO, then open the examples from File-> Example

Build and upload the examples, then open the serial monitor to check the logs

Expected

Connect the PAx pin to PBx pin, for example, connect PA0 to PB0 by cables. The PAx pins are set as output, and PBx are set as input. The status of PAx pins output toggle every 550ms in order like water lamp, every time the PAx pins toggle, it all causes the PBx pin to interrupt and printed the status to the serial monitor.