Good evening sdturner (or what part of the day it is with you), here its 10PM.
This is just for practise and learning the basic stuff, so I do not need it to be all that accurate, but to get it working would be nice
I have tried Google, but most of the answers assume I know a lot more that I do. But, I have come a little way by now, and tried a few things with some results, but still a bit far off where I should be.
I am attaching to photos. The first setup was using 2 1K resistors, the second using also a 1K resistor.
The first setup just gave a constant flow of the same number no matter if I cooled or heated the sensor. The second setup "worked" but it only gave values with in a range of 20 (445 to 465) when measuring in a glass with ice and putting the sensor in the arm pit, which is all to narrow... I tried larger and smaller resistors, but that did not help.
I got a suggestion elsewhere to learn this, and apply it: https://en.wikipedia.org/wiki/Wheatstone_bridge
Or to learn using op-amps... still not sure what it is
This is my code:
const int tempPin = A0; //A5
void setup() {
Serial.begin(9600);
pinMode(tempPin, INPUT);
}
void loop() {
int val;
val = analogRead(tempPin);
Serial.println(val);
delay(500);
}
Any suggestion or advice is appreciated!