MCP23008 + WiFi/USB Nextgen Communications Module + Pi Zero

Hardware
1

The pi is connected to the module via usb. In node red I can easily connect to the “serial in” node however when trying to connect the MCP23008 node it will not connect following the online directions. I notice that the “serial in” node comes up with a different usb address USB0:115200-8N1 and the MCP23008 only has a generic address. /dev/ttyUSB0. I have enabled I2C on the pi. Do I need to download a specific firmware for this module to use with the pi? Thanks for your help.

2

Hi Scott,

I don’t think I fully follow what you are trying to accomplish. Do you think you could provide photos of your hardware setup?

Thank you,
Travis

3

I’ll work on getting some photos. I am connecting the pi via usb to the micro usb interface of the wifi module and having issues connecting the MCP23008 in node red. I did a test to see if I could get it connected using a serial node and I have success doing that. Same settings in the MCP23008 node will not work.

4

The wifi module is connected to the proXR relay module. Also, thanks for the fast reply.

5

unnamed
unnamed1920×2560 691 KB

6

Capture
serial node

relay setup
relay setup505×680 22.3 KB

The issue is not being able to connect the MCP23008 node to the Pi using the USB/WIFI module. The photos show the setup properties of the serial node that I used to test a connection and the MCP23008 node that will never connect.