Hi there, I’m fairly new to the Spark Core, so please bear with me :smile: I’m trying to get temperature readings by using a TMP36 temperature sensor, which I’ve managed to do with an Arduino. However with the Spark Core I’m getting analog readings of about 370~395 which isn’t converting to temper…

Hi @codefrenzy Do you have it hooked up up like this: [image] The blue capacitor is optional but does help with stability.

The image @bko posted is from the Measuring the Temperature section in the Annotated Examples part of the docs. There’s some explanation there (also pasted below) about the capacitor and why the sensor is so far away on the board: Notice how we are powering the sensor from 3.3V* pin instead of the…

Thanks for the quick responses! Hmm, no, I didn’t have it like that. I had a couple of things connected differently: I wasn’t connected to the 3.3V* pin. I had it connected to the VIn which I now see I really shouldn’t have been… https://community.spark.io/t/using-the-vin-as-a-5v-source/1040 . I d…

One other effect is that the Spark core runs a bit warm, like just slightly warm to the touch. This is enough to heat up the breadboard over time and raise the temp of the sensor a few degrees from the air temp. If you can get the TMP36 physically away from the Spark with longer wires solder on or…

I’m having the exact same problem, TMP36 is returning values between 350 and 400 which would represent very low temperatures. I have wired it exactly as the annotated example suggests with the exception of the ceramic capacitor (just because I didn’t have one at home). Would it be just because of t…

Use the capacitor - for me this wasn’t just stability, it made the readings fall into the correct range too.

Yeah, the capacitor is not optional for me either in order to get the correct readings. Use it. (Otherwise, the values are way low and show -22°C.)

The TMP36 needs a resistor between VOUT and GND, or its readings will be almost random. [image] TMP36 Temperature Sensor - Reliable and Accurate Hardware I have just discovered why I have had trouble in the past with the TMP36…

Can anyone provide me with the code they are using for the Temperature sensor Cheers

Try this (it’s a quick “port” of adafruit code - since I can’t find the Particle version right now) /* Sensor test sketch for more information see http://www.ladyada.net/make/logshield/lighttemp.html */ #define aref_voltage 3.3 // we tie 3.3V to ARef and measure it with a multimeter! …

TMP36 reading analog values of around 370~395 [SOLVED]

Hardware

SimonM February 16, 2015, 11:14am 9

The TMP36 needs a resistor between VOUT and GND, or its readings will be almost random.

Topic		Replies	Views
Analog pin outputs 1.7v when set to input? Hardware	45	10208	December 5, 2014
Odd analog readings [SOLVED] Troubleshooting	57	30789	April 9, 2014
Temp Sensor Variations Hardware	7	2474	March 6, 2015
Trouble with Temperature Sensor General	4	4601	February 20, 2015
Temperature readings are all over the place Troubleshooting	9	4198	May 1, 2014

TMP36 reading analog values of around 370~395 [SOLVED]

Related topics