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Setting an analog Temp and RH sensor (SHT31 A) on a CR1000

Cristian Oct 2, 2018 05:23 PM

Hello

I would appreciate help to understand the transformation number to go from the sensor signal to the actual value. For the SHT31 analog, the original formulas (on pag 8 of***) are: "t = -66.875+218.75*(SEreading)/Voltage" and "RH = -12.5+125*(SEreading_2*)/Voltage". In Arduino, the analog readings are multiplied by 0.00049 (0.00049=5V/1024; 1024=2^10bits). I'm not sure how this work for the cr1000; however, I believe the actual conversion number for the cr1000 would by around 0.000198. I got this number just by approximation to thermometer's readings. So my formula are  t = -66.875+218.75*SEreading*0.000198" and "RH = -12.5+125*SEreading_2*0.000198".

I would appreciate some help to know if my formulas are correct.

***  https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/0_Datasheets/Humidity/Sensirion_Humidity_Sensors_SHT3x_Datasheet_analog.pdf

Thanks,

Cristian

smile Oct 20, 2018 05:33 AM

Hi,

remember that the CR1000 measures mV, then numbers one thousand times larger than the Volt.

Smile

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