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Commit 9b40e712 authored by Clement Remi's avatar Clement Remi
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V1.5, with all technical modificaation

parent eff48a82
master EGU23 MUX_board_v2024 battery_charger board_v4 code_refactor dev2 mqtt revert-559ef012 v2023.0.0
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Ohmpi.py
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""" """
created on January 6, 2020 created on January 6, 2020
Update December 2021 Update mars 2021
Ohmpi.py is a program to control a low-cost and open hardward resistivity meter OhmPi that has been developed by Rémi CLEMENT(INRAE),Vivien DUBOIS(INRAE),Hélène GUYARD(IGE), Nicolas FORQUET (INRAE), and Yannick FARGIER (IFSTTAR). Ohmpi.py is a program to control a low-cost and open hardward resistivity meter OhmPi that has been developed by Rémi CLEMENT(INRAE),Vivien DUBOIS(INRAE),Hélène GUYARD(IGE), Nicolas FORQUET (INRAE), and Yannick FARGIER (IFSTTAR).
""" """
...@@ -11,70 +11,116 @@ print('| | | | _ || |\/| || __/ | |') ...@@ -11,70 +11,116 @@ print('| | | | _ || |\/| || __/ | |')
print('\ \_/ / | | || | | || | _| |_') print('\ \_/ / | | || | | || | _| |_')
print(' \___/\_| |_/\_| |_/\_| \___/ ') print(' \___/\_| |_/\_| |_/\_| \___/ ')
print('\033[0m') print('\033[0m')
print('OHMPI start' ) print('OhmPi start' )
print('Vers: 1.50') print('Vers: 1.51')
print('Import library') print('Import library')
import RPi.GPIO as GPIO
import time , board, busio, numpy, os, sys, json, glob
from datetime import datetime import time , board, busio, numpy, os, sys, json, glob,os.path,adafruit_tca9548a
import adafruit_ads1x15.ads1115 as ADS import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn from adafruit_ads1x15.analog_in import AnalogIn
from pandas import DataFrame from pandas import DataFrame
# import pandas as pd from datetime import datetime
import os.path from adafruit_mcp230xx.mcp23008 import MCP23008
from gpiozero import CPUTemperature from adafruit_mcp230xx.mcp23017 import MCP23017
import digitalio
""" from digitalio import Direction
display start time
"""
current_time = datetime.now() current_time = datetime.now()
print(current_time.strftime("%Y-%m-%d %H:%M:%S")) print(current_time.strftime("%Y-%m-%d %H:%M:%S"))
""" """
hardware parameters hardware parameters
""" """
R_ref = 50.25# reference resistance value in ohm R_shunt = 0.2# reference resistance value in ohm
coef_p0 = 2.50427 # slope for current conversion for ADS.P0, measurement in V/V coef_p2 = 2.50# slope for current conversion for ADS.P2, measurement in V/V
coef_p1 = 2.50378# slope for current conversion for ADS.P1, measurement in V/V coef_p3 = 2.50 # slope for current conversion for ADS.P3, measurement in V/V
coef_p2 = 2.50447 # slope for current conversion for ADS.P2, measurement in V/V offset_p2= 0
coef_p3 = 2.50259 # slope for current conversion for ADS.P3, measurement in V/V offset_p3= 0
offset_p0=-0.004814 integer=10
offset_p1= 0.005243 meas=numpy.zeros((3,integer))
offset_p2= 0.004238
offset_p3= 0.006433
export_path = "/home/pi/Desktop/measurement.csv"
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
# GPIO initialization
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(8, GPIO.OUT)
integer=100# if noise increase
meas=numpy.zeros((4,integer))
""" """
import parameters import parameters
""" """
with open('ohmpi_param.json') as json_file: with open('ohmpi_param.json') as json_file:
pardict = json.load(json_file) pardict = json.load(json_file)
i2c = busio.I2C(board.SCL, board.SDA) # I2C protocol setup
ads = ADS.ADS1115(i2c, gain=2/3,data_rate=860) # I2C communication setup i2c = busio.I2C(board.SCL, board.SDA) #activation du protocle I2C
mcp = MCP23008(i2c, address=0x20) #connexion I2C MCP23008, injection de courant
ads_current = ADS.ADS1115(i2c, gain=16,data_rate=860, address=0X48)# connexion ADS1115, pour la mesure de courant
ads_voltage = ADS.ADS1115(i2c, gain=2/3,data_rate=860, address=0X49)# connexion ADS1115, pour la mesure de courant
#initialisation desvoie pour la polarité
pin0 = mcp.get_pin(0)
pin0.direction = Direction.OUTPUT
pin1 = mcp.get_pin(1)
pin1.direction = Direction.OUTPUT
pin0.value = False
pin1.value = False
# Initialisation MUX
Elec_A= adafruit_tca9548a.TCA9548A(i2c, 0X76)
Elec_B= adafruit_tca9548a.TCA9548A(i2c, 0X71)
Elec_M= adafruit_tca9548a.TCA9548A(i2c, 0X74)
Elec_N= adafruit_tca9548a.TCA9548A(i2c, 0X70)
""" """
functions functions
""" """
# function swtich_mux select the right channels for the multiplexer cascade for electrodes A, B, M and N. # function swtich_mux select the right channels for the multiplexer cascade for electrodes A, B, M and N.
def switch_mux(quadripole): def switch_mux(quadripole):
path2elec = numpy.loadtxt("path2elec.txt", delimiter=" ", dtype=bool) elec_adress=[0x76,0X71,0x74,0x70]
quadmux = numpy.loadtxt("quadmux.txt", delimiter=" ", dtype=int)
for i in range(0,4):
tca= adafruit_tca9548a.TCA9548A(i2c, elec_adress[i]) #choose MUX A B M or N
if quadripole[i] < 17:
nb_i2C=7
a=quadripole[i]
elif quadripole[i] > 16 and quadripole[i] < 33:
nb_i2C=6
a=quadripole[i]-16
elif quadripole[i] > 32 and quadripole[i] < 49:
nb_i2C=5
a=quadripole[i]-32
elif quadripole[i] > 48 and quadripole[i] < 65:
nb_i2C=4
a=quadripole[i]-48
mcp = MCP23017(tca[nb_i2C])
mcp.get_pin(a-1).direction=digitalio.Direction.OUTPUT
mcp.get_pin(a-1).value=True
print(quadripole[i])
#function to switch off mux
def ZERO_mux(nb_elec):
elec_adress=[0x76,0X71,0x74,0x70]
for i in range(0,4): for i in range(0,4):
for j in range(0,5) : tca= adafruit_tca9548a.TCA9548A(i2c, elec_adress[i]) #choose MUX A B M or N
GPIO.output(int(quadmux[i,j]), bool(path2elec[quadripole[i]-1,j])) for y in range(0,nb_elec):
qd=y+1
if qd < 17:
nb_i2C=7
a=qd
elif qd > 16 and qd < 33:
nb_i2C=6
a=qd-16
elif qd > 32 and qd < 49:
nb_i2C=5
a=qd-32
elif qd > 48 and qd < 65:
nb_i2C=4
a=qd-48
mcp = MCP23017(tca[nb_i2C])
mcp.get_pin(a-1).direction=digitalio.Direction.OUTPUT
mcp.get_pin(a-1).value= False
# function to find rows with identical values in different columns # function to find rows with identical values in different columns
def find_identical_in_line(array_object): def find_identical_in_line(array_object):
...@@ -93,7 +139,7 @@ def find_identical_in_line(array_object): ...@@ -93,7 +139,7 @@ def find_identical_in_line(array_object):
if any(temp > 1): if any(temp > 1):
output.append(i) output.append(i)
return output return output
#
# read quadripole file and apply tests # read quadripole file and apply tests
def read_quad(filename, nb_elec): def read_quad(filename, nb_elec):
output = numpy.loadtxt(filename, delimiter=" ",dtype=int) # load quadripole file output = numpy.loadtxt(filename, delimiter=" ",dtype=int) # load quadripole file
...@@ -112,85 +158,64 @@ def read_quad(filename, nb_elec): ...@@ -112,85 +158,64 @@ def read_quad(filename, nb_elec):
sys.exit(1) sys.exit(1)
else: else:
return output return output
def read_temp():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string) / 1000.0
return temp_c
# perform a measurement def run_measurement(nb_stack, injection_deltat, R_shunt, coefp2, coefp3, elec_array):
def run_measurement(nb_stack, injection_deltat, Rref, coefp0, coefp1, coefp2, coefp3, elec_array):
start_time=time.time() start_time=time.time()
# inner variable initialization # inner variable initialization
sum_I=0 sum_I=0
sum_Vmn=0 sum_Vmn=0
sum_Ps=0 sum_Ps=0
pin0.value = False
pin1.value = False
# injection courant and measure # injection courant and measure
for n in range(0,3+2*nb_stack-1) : for n in range(0,3+2*nb_stack-1) :
# current injection # current injection
if (n % 2) == 0: if (n % 2) == 0:
GPIO.output(7, GPIO.HIGH) # polarity n°1 pin1.value = True
pin0.value = False # current injection polarity n°1
else: else:
GPIO.output(7, GPIO.LOW) # polarity n°2 pin0.value = True
GPIO.output(8, GPIO.HIGH) # current injection pin1.value = False# injection de courant polarity n°2
start_delay=time.time() start_delay=time.time()
time.sleep(injection_deltat) # delay depending on current injection duration time.sleep(injection_deltat) # delay depending on current injection duration
if n==0:
Tx=AnalogIn(ads,ADS.P0).voltage
Tab=AnalogIn(ads,ADS.P1).voltage
for k in range(0,integer): for k in range(0,integer):
meas[0,k] = AnalogIn(ads,ADS.P0).voltage # reading current value on ADS channel A0 meas[0,k] = ((AnalogIn(ads_current,ADS.P0).voltage/50)/R_shunt)*1000 # reading current value on ADS channel A0
meas[1,k] = AnalogIn(ads,ADS.P1).voltage meas[1,k] = AnalogIn(ads_voltage,ADS.P0).voltage * coefp2*1000
meas[2,k] = AnalogIn(ads,ADS.P2).voltage # reading voltage value on ADS channel A2 meas[2,k] = AnalogIn(ads_voltage,ADS.P1).voltage * coefp3*1000 # reading voltage value on ADS channel A2
meas[3,k] = AnalogIn(ads,ADS.P3).voltage pin1.value = False; pin0.value = False# stop current injection
# print(AnalogIn(ads,ADS.P0,ADS.P1).voltage)
# time.sleep(1)
GPIO.output(8, GPIO.LOW)# stop current injection
end_delay=time.time() end_delay=time.time()
sum_I=sum_I+(numpy.mean(meas[0,:]))
sum_I=sum_I+(((numpy.mean(meas[0,:])*coefp0)+offset_p0)-(((numpy.mean(meas[1,:])*coefp1)+offset_p1)))/Rref Vmn1=((numpy.mean(meas[1,:]))-(numpy.mean(meas[2,:])))
Vmn1= ((numpy.mean(meas[2,:])*(coefp2))+ offset_p2)-((numpy.mean(meas[3,:])*(coefp3))+offset_p3)
if (n % 2) == 0: if (n % 2) == 0:
sum_Vmn=sum_Vmn-Vmn1 sum_Vmn=sum_Vmn-Vmn1
sum_Ps=sum_Ps+Vmn1 sum_Ps=sum_Ps+Vmn1
else: else:
sum_Vmn=sum_Vmn+Vmn1 sum_Vmn=sum_Vmn+Vmn1
sum_Ps=sum_Ps+Vmn1 sum_Ps=sum_Ps+Vmn1
end_calc=time.time() end_calc=time.time()
time.sleep((end_delay-start_delay)-(end_calc-end_delay)) time.sleep((end_delay-start_delay)-(end_calc-end_delay))
# return averaged values # return averaged values
cpu= CPUTemperature() # cpu= CPUTemperature()
output = DataFrame({ output = DataFrame({
"time":[datetime.now()], "time":[datetime.now()],
"A":elec_array[0], "A":elec_array[0],
"B":elec_array[1], "B":elec_array[1],
"M":elec_array[2], "M":elec_array[2],
"N":elec_array[3], "N":elec_array[3],
"Vmn [mV]":[(sum_Vmn/(3+2*nb_stack-1))*1000], "Vmn [mV]":[(sum_Vmn/(3+2*nb_stack-1))],
"I [mA]":[(sum_I/(3+2*nb_stack-1))*1000], "I [mA]":[(sum_I/(3+2*nb_stack-1))],
"R [ohm]":[( (sum_Vmn/(3+2*nb_stack-1)/(sum_I/(3+2*nb_stack-1))))], "R [ohm]":[( (sum_Vmn/(3+2*nb_stack-1)/(sum_I/(3+2*nb_stack-1))))],
"Rab [KOhm]":[(Tab*2.47)/(sum_I/(3+2*nb_stack-1))/1000], # "Rab [KOhm]":[(Tab*2.47)/(sum_I/(3+2*nb_stack-1))/1000],
"Tx [V]":[Tx*2.47], # "Tx [V]":[Tx*2.47],
"Ps [mV]":[(sum_Ps/(3+2*nb_stack-1))*1000], "Ps [mV]":[(sum_Ps/(3+2*nb_stack-1))],
"nbStack":[nb_stack], "nbStack":[nb_stack],
"CPU temp [°C]":[cpu.temperature], # "CPU temp [°C]":[cpu.temperature],
"Hardware temp [°C]":[read_temp()-8], # "Hardware temp [°C]":[read_temp()-8],
"Time [S]":[(-start_time+time.time())] "Time [S]":[(-start_time+time.time())]
# "Rcontact[ohm]":[Rc], # "Rcontact[ohm]":[Rc],
# "Rsoil[ohm]":[Rsoil], # "Rsoil[ohm]":[Rsoil],
...@@ -199,7 +224,7 @@ def run_measurement(nb_stack, injection_deltat, Rref, coefp0, coefp1, coefp2, co ...@@ -199,7 +224,7 @@ def run_measurement(nb_stack, injection_deltat, Rref, coefp0, coefp1, coefp2, co
# Dead time equivalent to the duration of the current injection pulse # Dead time equivalent to the duration of the current injection pulse
}) })
output=output.round(1) output=output.round(2)
print(output.to_string()) print(output.to_string())
time.sleep(1) time.sleep(1)
return output return output
...@@ -216,20 +241,6 @@ def append_and_save(path, last_measurement): ...@@ -216,20 +241,6 @@ def append_and_save(path, last_measurement):
with open(path, 'a') as f: with open(path, 'a') as f:
last_measurement.to_csv(f, header=True) last_measurement.to_csv(f, header=True)
"""
Initialization of GPIO channels
"""
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
"""
Initialization of multiplexer channels
"""
# pinList = [12,16,20,21,26,18,23,24,25,19,6,13,4,17,27,22,10,9,11,5] # List of GPIOs enabled for relay cards (electrodes)
# for i in pinList:
# GPIO.setup(i, GPIO.OUT)
# GPIO.output(i, GPIO.HIGH)
""" """
Main loop Main loop
...@@ -238,23 +249,19 @@ N=read_quad("ABMN.txt",pardict.get("nb_electrodes")) # load quadripole file ...@@ -238,23 +249,19 @@ N=read_quad("ABMN.txt",pardict.get("nb_electrodes")) # load quadripole file
if N.ndim == 1: if N.ndim == 1:
N = N.reshape(1, 4) N = N.reshape(1, 4)
ZERO_mux(pardict.get("nb_electrodes"))
for g in range(0,pardict.get("nbr_meas")): # for time-lapse monitoring for g in range(0,pardict.get("nbr_meas")): # for time-lapse monitoring
for i in range(0,N.shape[0]): # loop over quadripoles for i in range(0,N.shape[0]): # loop over quadripoles
# call the switch_mux function to switch to the right electrodes # call the switch_mux function to switch to the right electrodes
# switch_mux(N[i,])
switch_mux(N[i,])
# run a measurement # run a measurement
current_measurement = run_measurement(pardict.get("stack"), pardict.get("injection_duration"), R_ref, coef_p0, coef_p1, coef_p2, coef_p3, N[i,]) current_measurement = run_measurement(pardict.get("stack"), pardict.get("injection_duration"), R_shunt, coef_p2, coef_p3, N[i,])
ZERO_mux(pardict.get("nb_electrodes"))
# save data and print in a text file #save data and print in a text file
append_and_save(pardict.get("export_path"), current_measurement) append_and_save(pardict.get("export_path"), current_measurement)
# reset multiplexer channels ZERO_mux(pardict.get("nb_electrodes"))
# GPIO.output(12, GPIO.HIGH); GPIO.output(16, GPIO.HIGH); GPIO.output(20, GPIO.HIGH); GPIO.output(21, GPIO.HIGH); GPIO.output(26, GPIO.HIGH)
# GPIO.output(18, GPIO.HIGH); GPIO.output(23, GPIO.HIGH); GPIO.output(24, GPIO.HIGH); GPIO.output(25, GPIO.HIGH); GPIO.output(19, GPIO.HIGH)
# GPIO.output(6, GPIO.HIGH); GPIO.output(13, GPIO.HIGH); GPIO.output(4, GPIO.HIGH); GPIO.output(17, GPIO.HIGH); GPIO.output(27, GPIO.HIGH)
# GPIO.output(22, GPIO.HIGH); GPIO.output(10, GPIO.HIGH); GPIO.output(9, GPIO.HIGH); GPIO.output(11, GPIO.HIGH); GPIO.output(5, GPIO.HIGH)
time.sleep(pardict.get("sequence_delay")) #waiting next measurement (time-lapse) time.sleep(pardict.get("sequence_delay")) #waiting next measurement (time-lapse)
measurement.csv
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ohmpi_param.json
+ 4
− 4
View file @ 9b40e712
{ {
"nb_electrodes": 32, "nb_electrodes": 64,
"injection_duration": 0.250, "injection_duration": 0.5,
"nbr_meas": 10000, "nbr_meas": 10000,
"sequence_delay": 5, "sequence_delay": 5,
"stack": 3, "stack": 1,
"export_path": "/home/pi/myohmpi2/ohmpi1_5/measurement.csv" "export_path": "/home/pi/ohmpi1_5/measurement.csv"
} }
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