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Need to investigate further. This is true when using the external power, however powering an Arduino Mega with the USB only resulted in a board voltage of 4. So what is the problem? I am planning on rebuilding the circuit tonight basic temperature sensor, uncalibrated.

The sensor is hooked up backwards! It may corrupt the module memory. The sensor itself is quite cheap to make the orange board , the sensor IC is about 3 dollars, and the rest are some wire jumpers, a 2k trim potentiometer and a resistor. Here is a screenshot of the software. The sensor turns out to be quite accurate and highly responsive — I can breath on the sensor lightly and detect a minute temperature change.

Right now it is obviously not waterproof, but that is easily solvable with some heat shrink tubing this is actually recommended in the IC datasheet by the manufacturer for making waterproof temp. A diagram of the board, and all the parts used. Could you post the actual schematic, just so it is more clear, how the connections on the test board were made.

Also, how cheap is Arduino? Do you know if it is available worldwide? I see so much potential use for this gizmo it is mind boggling. Also, do you know, how accurate are the readouts from Arduino? Lots more information on these boards is available on the Arduino. Great little boards and I love them to death.

Your question about accuracy— the accuracy would be as good as your sensor. I then convert the number to volts, then to kelvin, then to celcius. The trim pot used is actually 5k 10k works, but I found 5k is actually better for the 5V load you get from the Arduino , and the R1 resistor is 2k.

Find the LMz from Mouser or some other electronics supply. I can buy them from my local electronics shop they are that common. Share this:.

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