Wiring for Temperature Probe

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NTangerine
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Wiring for Temperature Probe

Post by NTangerine » September 28th, 2019, 8:22 pm

Since the temperature probe has to be submerged in water, I'm not sure if there'll be electrical interference while the wire is submerged or if the difference would be significant enough. What would be the most optimal insulated wiring to be used in this case? I plan to use a TMP36 analog temperature sensor with a 10mV/°C scale factor (according to its data sheet). Also, would heat shrink with adhesive, along with clear nail enamel be sufficient enough for waterproofing the entire sensor?
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Re: Wiring for Temperature Probe

Post by jinhusong » September 29th, 2019, 10:17 pm

When we used it in the mission possible, we just heat shrunk half of the sensor head. No water got in.

This time, need to test in warm water.

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Re: Wiring for Temperature Probe

Post by pranayramaswamy » October 21st, 2019, 3:41 pm

At the competition are we allowed to use TMP 36, because the sensor has to be non-programmable and I thought TMP 36 was pre-programmed?

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Re: Wiring for Temperature Probe

Post by Crimesolver » October 21st, 2019, 5:56 pm

pranayramaswamy wrote:
October 21st, 2019, 3:41 pm
At the competition are we allowed to use TMP 36, because the sensor has to be non-programmable and I thought TMP 36 was pre-programmed?
according to the SO, TMP36 are legal analog sensors
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Re: Wiring for Temperature Probe

Post by jinhusong » November 10th, 2019, 1:34 pm

I played with TMP36 with Arduino Due for. a while.

It outputs different voltages between USB power Arduino and 9V battery power Arduino. After all kinds of testing, we found power TMP36 from a separate power supply solved the problem.

The root cause is still not clear, we may need to borrow a scope to look at the power and output of TMP36.

Setup:
TMP36 with 0.1u capacitor between Vs and Gnd, powered by 3.3v from Arduino Due or 3.9v from 3AA Batteries.
1602 i2c LCD display on 5V power from Arduino.

Jinhu

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