Alright, so I wanna get my hands dirty with Arduino.
I wanted to mess with Thermistor's as my first project. Just reading tempature from a Thermistor.
I have a product from Mouser Electronics, that I want to use as my thermistor.
That's this thermistor : GA50K6A1A
I even looked at, and have the Datasheet.
It's a nice one, very accurate, and not too expensive.
So, I see that it has a chart how the resistances relate to the temperatures. That's great !
Fantastic.
So.. 50,000 Ω @ 25°C
(°C x 1.8) + 32 = °F
25 x 1.8 = 45 + 32 = 77°F
Great.
Alright, here's the part where I need help.
50,000Ω = 25°C
47,724Ω = 26°C
50,000 - 47,724 = 2,276Ω Difference, when tempature rises 1°C
Again.. According to the chart.
26°C = 47,724Ω
27°C = 45,564Ω
47,724 - 45,564 = 2160 Difference.
That sure looks different than 2,276.
So what gives?
Why the heck doesn't it stay the same for each time the tempature changes 1°C ?
I looked online, and there is a formula, but it's EXTREMELY CONFUSING. Because I simply don't understand.
Also, my last question, why do I need a resistor for the thermistor, if the thermistor is already a resistor?
I wanted to mess with Thermistor's as my first project. Just reading tempature from a Thermistor.
I have a product from Mouser Electronics, that I want to use as my thermistor.
That's this thermistor : GA50K6A1A
I even looked at, and have the Datasheet.
It's a nice one, very accurate, and not too expensive.
So, I see that it has a chart how the resistances relate to the temperatures. That's great !
Fantastic.
So.. 50,000 Ω @ 25°C
(°C x 1.8) + 32 = °F
25 x 1.8 = 45 + 32 = 77°F
Great.
Alright, here's the part where I need help.
50,000Ω = 25°C
47,724Ω = 26°C
50,000 - 47,724 = 2,276Ω Difference, when tempature rises 1°C
Again.. According to the chart.
26°C = 47,724Ω
27°C = 45,564Ω
47,724 - 45,564 = 2160 Difference.
That sure looks different than 2,276.
So what gives?
Why the heck doesn't it stay the same for each time the tempature changes 1°C ?
I looked online, and there is a formula, but it's EXTREMELY CONFUSING. Because I simply don't understand.
Also, my last question, why do I need a resistor for the thermistor, if the thermistor is already a resistor?