EC Meter issue with ESP running micropython

Other Hardware Science and Measurement
1

I've tried to convert this project

https://create.arduino.cc/projecthub/mircemk/arduino-electrical-conductivity-ec-ppm-tds-meter-c48201

on making a EC meter, into MicroPython code I can run on my ESP-32 module. But is seems that the values/variables dont update when i run the function. The PrintReadings() function just prints out what ever value I assigned it to (0, None).

I can get the rawEC and Temperature running fine on its own, but everything else just prints out 0.

rawEC: 0
Rc: 0
EC: 0 Simens
0 ppm
22.9375 *C

What am I doing wrong?

2

from temperature import TemperatureSensor # importerer Temperatur dokumentet
import time
from machine import Pin, ADC

pin = 25
t = TemperatureSensor(pin) # her kalder vi klassen. funktioner kan kaldes via t.funktion

R1 = 1000
Ra = 25 #Resistance of powering Pins
ECPin = ADC(Pin(32, Pin.IN))
ECGround = Pin(27, Pin.OUT)
ECPower = Pin(14, Pin.OUT)

Hana [USA] PPMconverion: 0.5

Eutech [EU] PPMconversion: 0.64

#Tranchen [Australia] PPMconversion: 0.7

Why didnt anyone standardise this?

PPMconversion=0.64

#*************Compensating for temperature ************************************#
#The value below will change depending on what chemical solution we are measuring
#0.019 is generaly considered the standard for plant nutrients [google "Temperature compensation EC" for more info
TemperatureCoef = 0.019 #this changes depending on what chemical we are measuring

#********************** Cell Constant For Ec Measurements *********************#
#Mine was around 2.9 with plugs being a standard size they should all be around the same
#But If you get bad readings you can use the calibration script and fluid to get a better estimate for K
K=2.88

##***************************** END Of Recomended User Inputs *****************************************************************#

#OneWire oneWire(ONE_WIRE_BUS) # Setup a oneWire instance to communicate with any OneWire devices
#DallasTemperature sensors(&oneWire) # Pass our oneWire reference to Dallas Temperature.

Temperature = None

rawEC = ECPin.read()
Vin = 3.3
Vdrop = 0
R1=(R1+Ra)
Rc = 0
EC = 0
EC25 = 0
ppm = 0

buffer = 0

ECGround.value(0)
time.sleep_ms(1000)

def GetEC():

Temperature = t.read_temp()

#************Estimates Resistance of Liquid ****************
ECPower.value(1)
rawEC = ECPin.read()
rawEC = ECPin.read()
ECPower.value(0)

#***************** Converts to EC **************************
Vdrop = (VinrawEC)/1024.0
Rc = (VdropR1)/(Vin-Vdrop)
Rc = Rc-Ra #acounting for Digital Pin Resitance
EC = 1000/(Rc*K)

#Compensating For Temperaure*******
EC25 = EC/ (1 + TemperatureCoef*(Temperature-25.0))
ppm = (EC25)(PPMconversion1000)

def PrintReadings():

print("rawEC: {}".format(rawEC))
print("Rc: {}".format(Rc))
#print(Rc)
#print(" EC: ")
#print(EC25)
print("EC: {} Simens ".format(EC25))
#print(ppm)
print("{} ppm ".format(ppm))
#print(Temperature)
print("{} *C ".format(Temperature))
print('')

"""

Usued for debugging

print("Vdrop: ");
print(Vdrop);
print("Rc: ");
print(Rc);
print(EC);
print("Siemens");
#********** end of Debugging Prints *********
"""

while True:
Temperature = t.read_temp()
GetEC()
PrintReadings()
"""
ECPower.value(1)
rawEC = ECPin.read()
rawEC = ECPin.read()
ECPower.value(0)

print(rawEC)

"""
time.sleep_ms(2000)