I just got my spark core and have tried connecting an LM35 sensor to it, but am stumped with the results.
Tinker app gives me a reading of cca 492, and if I convert this to voltage, it should be 0,39 V, right?
If I measure with the voltmeter (measuring between A0 and GND), I get 0,29 V.
I also tried putting 3,3 V to another analog input, and I get 4095 which is fine.
I’ve also added an external LED with the resistor and connected the output of LED to another A input, which gives me 2331, which should be 1,87 V and which corresponds pretty well to voltmeter (1,89V).
What am I doing wrong here?
BTW - the temperature is around 24 Celzius, so maybe my temp sensor is quite off anyway (3 degrees).
I’ve now connected it an arduino clone and it’s weird - the voltmeter shows 0,25, arduino analogread the same.
I take temp sensor to spark core breadboard, voltmeter 0,29, spark core 0,39.
I also tried putting +v to temp sensor from VIN, which shows as 4,78 V at the moment, and got same results.