Quelltext der Seite WSAL22132 – AW9523B IO Expansion Board/en

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical overview of the AW9523B board with an I2C interface, 16 expandable I/O pins, and guides for Raspberry Pi, Arduino, and STM32.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL22132 WSAL22132 – AW9523B IO Expansion Board, I2C Interface, Expands 16 I/O Pins]

== Technical overview ==
* The board uses an AW9523B controller with an I2C interface and provides 16 I/O pins.
* Operating voltage is 3.3 V or 5 V; pinout includes VCC, GND, SDA, SCL, INT (interrupt output), and RST (reset).
* By changing the I2C address, up to four boards can be connected simultaneously, providing up to 64 I/O ports in total.
* For Raspberry Pi, enabling the I2C driver via “sudo raspi-config” under Interfacing Options is recommended, followed by a reboot.
* On Bookworm, only the lgpio library is available; bcm2835 and wiringPi cannot be installed or used there. The Python demo can run without additional installation.
* Raspberry Pi hardware connections are: VCC to 5V, GND to GND, SDA to pin 3, SCL to pin 5, INT to pin 16, RST to pin 18.
* Example code for C and Python is included in the downloaded “AW9523B-IO-Expansion-Board-Code” archive. For C: “cd C”, “sudo make clean”, “sudo make”, “sudo ./main”. For Python: “cd python”, “sudo python AW9523B.py”.
* In the test case, PAx pins are configured as outputs and PBx pins as inputs; the states toggle every 550 ms alternately like a chasing-light pattern.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
sudo raspi-config
sudo reboot
sudo wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
sudo tar zxvf bcm2835-1.71.tar.gz
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
sudo apt-get install wiringpi
wget https://files.waveshare.com/wiki/common/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
sudo git clone https://github.com/WiringPi/WiringPi
cd WiringPi
sudo ./build
sudo su
wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip
cd lg-master
sudo make install
sudo apt-get install p7zip-full -y
sudo wget https://files.waveshare.com/upload/b/b8/AW9523B-IO-Expansion-Board-Code.7z
</syntaxhighlight>

== Notes and version constraints ==
* The guide is based on the Arduino UNO R3; other Arduino boards may require modified connections or code changes.
* The STM32 examples are based on the STM32F103RBT6; other STM32 boards may need different connections and code modifications.
* When using Bookworm, bcm2835 and wiringPi are unavailable; only lgpio is supported.
* The interrupt line (INT) and reset line (RST) may be left unconnected if not needed (“could NC”).
* To disable the interrupt function, add “gpio=23=pu” to /boot/config.txt to set GPIO23 to pull-up mode.

== Source and revision record ==
* [https://www.waveshare.com/wiki/AW9523B_IO_Expansion_Board AW9523B IO Expansion Board - Waveshare Wiki]
* Source revision: 80376
* Captured: 2026-09-03T03:41:49+00:00
* SHA-256: <code>7765322902e1a0b01ef29432f39d9c79907cfe2f0eb2feb426e0c2d619de525f</code>