Need a Simple, calibrated temperature sensor you can monitor on your computer?

Uses include:

  1. Linear Amplifier Temperature Monitor (Mount in exhaust airflow or adjacent to finals)
  2. Heatsink temperature sensor.
  3. Room/ Outdoor Temperature.
  4. Remote Monitoring of equipment Temperature.

The   LM34 output is 10 millivolt/ degree Fahrenheit.

LM35 output is 10 millivolt/degree Centigrade.

You can use either sensor for this project, they require no calibration and are accurate +/- 1.5 degree.

Cost is approximately $1.60.   Use a 2-conductor shielded cable between the sensor and the WN-1

PC board connector to keep RF out of the system.  Solder C1, C2 and R2 directly to the pins of the

LM34/35.   Solder R3 and C3 directly to the pins of J5.   You can add up to four temperature sensors

to your WN-1 system using the four auxiliary analog inputs.   Sensors are available in TO92 from

Digikey or Allied Electronics (See the “Links” page).

schem_temp_sens

Instructions:

Solder C1, C2 and R2 directly to the pins of the temperature sensor.   Solder the 2-conductor cable to the circuit.

You can cover the sensor with Silicone to protect it from moisture if you want.  Add a piece of tubing over the sensor to protect it.

Solder R3 and C3 to the cable end and to J5.  You can use a 3-pin connector in one of the rear panel holes so

you easily unplug the cable from the unit.  A small stereo headphone jack will work fine.  From the stereo jack solder a wire to pins 5, 9 and 15, as shown.

Go to the Configuration software menu on your Wavenode software:

Set the vertical scale on Auxiliary Meter #1 for 200 if using a Fahrenheit sensor.   Set it to 100 if using the

Centigrade version.

Set the Vertical label on this meter to “Degrees”.

Set the Scale Factor to 100.  

You will now have a 0-200 F. meter (or 0-100 degree C). Your thermometer will read out directly in degrees C or degrees F.

If you notice intermittent operation when transmitting, you may have to put a ferrite core at each end of your shielded cable.