/products/raspberry-pi/b/blog/posts/monitoring-16-analogue-inputs-with-the-raspberry-piThe Custard Pi 3 plugs into the Raspberry Pi GPIO (A, B, B+ and 2) and provides 8 analogue inputs using the SPI bus. This post shows how you can connect 2 x Custard Pi 3 to a Raspberry Pi and get 16 inputs. (There is soldering required).The Custard Pen-USTelligent Community 12