Biosensor Array Body Temperature

The goal of this sensor is to provide regular measurement of the user's core body temperature.

It has been decided to switch the sensor from the tmp102 to the DS18B20 (http://www.sparkfun.com/products/245). The reasons follow:
- Fewer Arduino channels needed.
- Fewer wires needed from the sensor to the base unit.
- Fewer external components.
- 1-wire library doesn't interfere with the present, interrupt driven, main Arduino sketch structure.
Without a bare PCB requiring an enclosure, we have been able to shrink the sensor size and mount it, directly, onto the end of a multi-conductor cable. Heatshrink tubing is used to seal the connecton between the sensor and the cable.
The other end of the sensor cable is connected to a four conductor, 3.5mm, audio plug which connects to a female, four conductor, panel mounted 3.5mm audio socket on the base biosensor array unit.
Wiring color convention:
- Black wire - Ground
- Red wire - Power
- Yellow Wire - Data

Status

5/16/2011 - The DS18B20 sensor code has been added to the main Arduino sketch and is working. The physical sensor lead has been completed and the female plug on the main biosensor array unit has been mounted.
5/10/2011 - The decision has been made to switch from the tmp102 sensor to the DS18B20 1-wire sensor available from Sparkfun.com (http://www.sparkfun.com/products/245). This was done because it requires fewer external components; requires fewer Arduino channels; and we believe it won't interfere with our present interrupt driven Arduino sketch setup. This will represent version 2.0 of the body temperature sensor.
4/10/2011 - Communications testing complete - 4/10/2011 [[1]]