I want to wire the Sensirion SHT-75 sensor with many meters of cable. (e.g. 10m) There are some discussions about this in the old forum, but I didn't find a conclusive answer.
- Datasheet SHT75: http://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/Humidity/Sensirion_Humidity_SHT7x_Datasheet_V5.pdf
Connection on sensorside: I have currently used: Female connector RM 1,27 2 x 4 poles 605-008-1-2-00 W & P Products (supplier: Conrad nr 739193) These are just a bit too small for the sensor, but i can get them to fit.. For the first test with 10cm cable I soldered flat cable to the pins.
For the long cable, I was looking into shielded cable. I looked at STP cable. (4 shielded twisted pairs)
This leaves me currently with the following questions: 1) Anyone has a better connector for connecting to the SHT-75 ? 2) The STP cable has 4 pairs. So 8 lines for 4 lines. Should I best use one cable of each pair for each line (Vdd, Gnd, SCK, DATA), or should I combine the Vdd and GND with the SCK and DATA line to have better results? 3) Would using this shielded cable avoid me having to use a filter setup between the arduino and the cable? (as mentioned in: http://arduino.cc/forum/index.php/topic,14183.0.html ) I understand correctly this should be on the sensor side of the cable?