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).



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.