Input/output Switching Expanders for the Portsdown

[G8GKQ]

John, our hardware designer, points out that there are some useful IO Expander boards available on eBay should you wish to switch more PTT lines or indicators from the Portsdown:

http://www.ebay.co.uk/itm/I2C-IIC-Seria ... SwVRpZnPWo

and

http://www.ebay.com/itm/MCP23017-16-bit ... SwLnBXW-K3

These use I2C to control extra GPIO lines. Of course, you would need to modify the Portsdown software to use them, but in many cases this would be a simple case of editing a bash script.

Dave