Howdy, Im hoping I can find some guidance adapting the Atlas ENV-TMP code to the Core and at the same time learn more about microcontrollers. My understanding with the below code is that you take the volts and divide it by the resolution of the analog to digital converter. Beyond that I dont thin…

@canada7764 , more specifically, the voltage equivalent of an Analog input pin on the Core is: V = analogRead(analogPin) * (3.3 / 4095); = analogRead(analogPin) * 0.00081; where: analogPin is any analog input pin (A0 - A7) 3.3 represents the maximum input voltage on any analog input pin …

This sample code is quite well documented. But since the Core has some slight differences to the Arduino I’ll just convert the main function into Spark-Speak for you :wink: void setup() { Serial.begin(38400); pinMode(D2, OUTPUT); // we don't really like anonymous numbers ;-) pinMode(…

Thank you @ScruffR & @peekay123 . @peekay123 your explanation was exactly what i needed to get that light bulb moment.

I’ve just added some more to this comment :wink: Given the original value of 0.0048 as a “shorthand” for 5.0 / 1023.0 which is more like 0,00488759 as well as the “arbitrary” 20.5128 and the fact that your actual voltage might not be exactly 3.3V, precision should not be the prime concern :wink: F…

Along with what @ScruffR said, you may want to add a 0.01uF capacitor between the ADC input pin and GND as was done with other voltage-based sensors. :smile:

Atlas Scientific ENV-TMP

Firmware Libraries

canada7764 March 6, 2015, 1:45am 5

Being the fast reading, instant gratification type I didnt notice you final //comment until after noticing accurate temp range but wild swings. Care to explain?

Topic		Replies	Views
Analog pin outputs 1.7v when set to input? Hardware	45	10230	December 5, 2014
Odd analog readings [SOLVED] Troubleshooting	57	30813	April 9, 2014
Low ADC Readings Troubleshooting	28	13639	March 16, 2014
Odd analog readings (part 2) Troubleshooting	63	19484	May 22, 2017
"Measuring the temperature"-sample not getting to work correctly Troubleshooting	37	8815	April 9, 2014

Atlas Scientific ENV-TMP

Related topics