I have bought an Arduino DINo from KMtronic: http://sigma-shop.com/product/72/web-internet-ethernet-controlled-relay-board-arduino-compatible-rs485-usb.html
So far, everything is working great. I can control the relays and use the network through EtherCard, and will soon provide the community with the result of my work :grin:.
Now I would like to connect a DS18B20 temperature sensor to my board. It works OK if I use pins from the P1 connector (3.3V, GND and D2), but I can't get it to work using the opto-isolated inputs. I don't even know how to wire it properly. I suppose 3.3V and GND would still go to P1, and the data line I would connect to P2 would go to the "+" terminal of IN1 (for instance), but what should I connect to the "-" terminal? I tried connecting it to GND but it didn't work.
Can you help me? Thanks in advance!