Guru
Joined: 11/02/2018
Location: AustraliaPosts: 2800
| Posted: 12:10pm 26 Oct 2022 |
LOG() seems to work for me, ln e = 1.
> Print log(2.71828183)
1.000000001
>
Using
R1 = 10000 ' series resistor
beta = 4000 'thermistor coefficient
R0 = 10000 'thermistor reference resistance
T0 = 25 'thermistor reference temperature
Vs = 3.322 'Supply voltage
Vin = 1.661 'ADC voltage
in this
Ra = R1 * Vin / (Vs - Vin ) ' Calculate resistance
Temp = 1/(1/(T0+273.15) + Log(Ra/R0)/beta)-273.15 ' Calculate temperature
Temp = 1/(1/(T0+273.15) + Log(Ra/R0)/beta)-273.15 ' Calculate temperature
I get
> R1 = 10000 : Vs = 3.322 : Vin = 1.661 : beta = 4000 : R0 = 10000 : T0 = 25
> Ra = R1 * Vin / (Vs - Vin )
> ? Ra
10000
> Temp = 1/(1/(T0+273.15) + Log(Ra/R0)/beta)-273.15
> ? Temp
25
>
> Ra = R1 * Vin / (Vs - Vin )
> ? Ra
10000
> Temp = 1/(1/(T0+273.15) + Log(Ra/R0)/beta)-273.15
> ? Temp
25
>
Which is correct.