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100k NTC

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CTSchorsch
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100k NTC

Dear all,

i want to use a 100k NTC on my custom PCB, just because it is on stock here.

I change the second resistor to 100k too and modified the defines to the new Values and B Value

// NTC Termistors
#define NTC_RES(adc_val)                ((4095.0 * 100000.0) / adc_val - 100000.0)
#define NTC_TEMP(adc_ind)               (1.0 / ((logf(NTC_RES(ADC_Value[adc_ind]) / 100000.0) / 4380.0) + (1.0 / 298.15)) - 273.15)

is this correct ? at 20° C it looks good, but i don't trust other values at the moment

Regards

Georg

Danny Bokma
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Hold it against an icecube and in boiling water. Those are easy temperatures to verify it against.

CTSchorsch
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Yes, of course, but it is glued to the pcb...

I will try it with a new pcb... Thanks

 

Roger Wolff
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If you have it "in stock" it is easy to try another one against the icecube and boiling water...