Wiring IO pi with a "standard" I2C device
The IO Pi Plus is a 32 channel MCP23017 GPIO expander for the Raspberry Pi
15/05/2018
Posted by:
pabs.agro
Hi all. Sorry if the question is silly but I'm no expert in the electronic matters.
I bought a IO Pi Zero to expend my I2C pins. I followed the psh button and the LED tutorials, but when it comes to more complex device, I am stuck.
I'm trying to wire an Adafruit 7-segments with I2C backpack, with IO Pi. I understand how to wire +, -, but I don't know where to wire SCL and SDA.
Here is the wiring schema without IO Pi
.
Can you please help me ?
Thanks !
I bought a IO Pi Zero to expend my I2C pins. I followed the psh button and the LED tutorials, but when it comes to more complex device, I am stuck.
I'm trying to wire an Adafruit 7-segments with I2C backpack, with IO Pi. I understand how to wire +, -, but I don't know where to wire SCL and SDA.
Here is the wiring schema without IO Pi
.Can you please help me ?
Thanks !
15/05/2018
Posted by:
andrew
Hi
The digital I/O pins on the IO Pi Zero are not fast enough to be used as separate I2C buses so you will need to connect the display to the I2C bus on the GPIO header.
The diagram below shows how you would connect the display to the Raspberry Pi GPIO header. The D and C pins on the display go to the SDA and SCL pins on the Raspberry Pi and the + and - go to the 3.3V and GND pins. Pin 1 on the GPIO header is nearest to the SD card socket on the Pi.
The digital I/O pins on the IO Pi Zero are not fast enough to be used as separate I2C buses so you will need to connect the display to the I2C bus on the GPIO header.
The diagram below shows how you would connect the display to the Raspberry Pi GPIO header. The D and C pins on the display go to the SDA and SCL pins on the Raspberry Pi and the + and - go to the 3.3V and GND pins. Pin 1 on the GPIO header is nearest to the SD card socket on the Pi.
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