I'm using a MICS-6814 sensor (from china) which indicate 3 gaz concentrations (N02, NH3 and CO) by a analog sensor... on a pyboard.
Output voltages are very lows.
So, I use a ADS1115 amplificator. The result looks good.
But, I have interrogations about NO2 sensor.
The datasheet of the sensor : https://www.sgxsensortech.com/content/u ... -rev-8.pdf
My simple code :
Code: Select all
from machine import I2C
from ads1x15 import *
from time import sleep
i2c = I2C(2)
adc = ADS1115(i2c = i2c, address = 72, gain = 4)
while True:
value_no2 = adc.read( rate=0, channel1=0 )
value_nh3 = adc.read( rate=0, channel1=1 )
value_co = adc.read( rate=0, channel1=2 )
print("NO2brut= ", value_no2)
print("NH3brut= ", value_nh3)
print("CObrut= ", value_co)
no2_volt = value_no2 * (0.512/32767)
nh3_volt = value_nh3 * (0.512/32767)
co_volt = value_co * (0.512/32767)
print("NO2volt= ", no2_volt, "volt")
print("NH3volt= ", nh3_volt, "volt")
print("COvolt= ", co_volt, "volt")
no2 = (10) * (value_no2 * (0.512/32767))
nh3 = (100) * (value_nh3 * (0.512/32767))
co = (1000) * (value_co * (0.512/32767))
print("NO2= ", no2, "ppm")
print("NH3= ", nh3, "ppm")
print("CO= ", co, "ppm")
sleep(10)
Moreover, I can't display the result on the lcd160cr... a i2c conflict with ads1115? If someone known a solution for display result from ads1115?
Thanks.