Grove Sensors

[francesco.gallo]

Dear All,
Is There some way to use the grove sensors (i.e https://www.seeedstudio.com/category/Sensor-for-Grove-c-24.html) with WiPy?
For example, RaspberryPi provides the GrovePi kit.

Thanks in advance

[livius]

@francesco-gallo
Grove have many sensors - ask about some specific then someone can hep you

[francesco.gallo]

Hi Livius,
thanks a lot for your answer. In particular, I need support on Temperature sensors (http://wiki.seeed.cc/Grove-Temperature_Sensor_V1.2/), but in general my question regards all grove sensors.

Thanks in advance

[livius]

@francesco-gallo
I do not have this one but it look like simple analog sensor
use ADC for it - but remember about voltage levels 3V3 not 5V!

[francesco.gallo]

@livius Ok...I will try :D

Thanks a lot

BR

[livius]

@francesco-gallo

i do not tested this but you can try

from machine import ADC
from math import log
sensor_T = 4275 #T value          
sensor_R = 100000 # resistance            

adc = ADC(0)
adc_c = adc.channel(pin='P13')

while True:
    value = adc_c();

    R = 1023.0/value-1.0
    R = sensor_R*R

    temp = 1.0/(log(R/sensor_R)/sensor_T+1/298.15)-273.15; # convert to temperature

    print('temp: ', str(temp))

[robert-hh]

@francesco-gallo In addition to the hints given by @livius some notes:
a) you can and should run the Grive sensor at Vcc of 3.3V
b) change the lines

adc = ADC(0)
adc_c = adc.channel(pin='P13')

to

adc = ADC(0, bits=10)
adc_c = adc.channel(pin='P13', attn=adc.ATTN_11DB)"
``'
to cope with the 3.3V range of the sensor and set it to 10 bit, which is assumed by the code.

[livius]

@robert-hh
good point

[francesco.gallo]

@robert-hh Thanks a lot...I will try soon