Commit e58924be authored by Forquet Nicolas's avatar Forquet Nicolas
Browse files

Merge branch 'develop'

parents 69ff3ce1 683938bb
sudo apt-get install python3-venv (déjà installé)
sudo apt-get install libatlas-base-dev
mkdir python-virtual-environments
cd python-virtual-environments
python3 -m venv ohmpi
source ohmpi/bin/activate
pip install RPi.GPIO
pip install adafruit-blinka
pip install numpy
pip install adafruit-circuitpython-ads1x15
......@@ -6,17 +6,42 @@ OHMPY, it has been developed by Rémi CLEMENT,Vivien DUBOIS, Nicolas FORQUET (IR
print 'OHMPI start'
print MyDateTime.isoformat()
print 'Import library'
print('OHMPI start' )
print('Import library')
import RPi.GPIO as GPIO
import time
import datetime
from datetime import datetime
import board
import busio
import numpy
import os
import sys
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn
import pandas as pd
import os.path
display start time
current_time =
print(current_time.strftime("%Y-%m-%d %H:%M:%S"))
nb_electrodes = 32 # maximum number of electrodes on the resistivity meter
injection_duration = 0.5 # Current injection duration in second
nbr_meas= 1 # Number of times the quadripole sequence is repeated
sequence_delay= 30 # Delay in seconds between 2 sequences
stack= 1 # repetition of the current injection for each quadripole
R_ref = 50 # reference resistance value in ohm
coef_p0 = 2.02 # slope for current conversion for ADS.P0, measurement in ???
coef_p1 = 2.02 # slope for current conversion for ADS.P1, measurement in ???
export_path = "/home/pi/Desktop/ohmpy-develop/measurement.csv"
......@@ -29,7 +54,106 @@ def switch_mux(quadripole):
for j in range(0,5) :
GPIO.output(int(quadmux[i,j]), bool(path2elec[quadripole[i]-1,j]))
# function to find rows with identical values in different columns
def find_identical_in_line(array_object):
output = []
if array_object.ndim == 1:
temp = numpy.zeros(4)
for i in range(len(array_object)):
temp[i] = numpy.count_nonzero(array_object == array_object[i])
if any(temp > 1):
for i in range(len(array_object[:,1])):
temp = numpy.zeros(len(array_object[1,:]))
for j in range(len(array_object[1,:])):
temp[j] = numpy.count_nonzero(array_object[i,:] == array_object[i,j])
if any(temp > 1):
return output
# read quadripole file and apply tests
def read_quad(filename, nb_elec):
output = numpy.loadtxt(filename, delimiter=" ",dtype=int) # load quadripole file
# locate lines where the electrode index exceeds the maximum number of electrodes
test_index_elec = numpy.array(numpy.where(output > 32))
# locate lines where an electrode is referred twice
test_same_elec = find_identical_in_line(output)
# if statement with exit cases (rajouter un else if pour le deuxième cas du ticket #2)
if test_index_elec.size != 0:
for i in range(len(test_index_elec[0,:])):
print("Error: An electrode index at line "+ str(test_index_elec[0,i]+1)+" exceeds the maximum number of electrodes")
elif len(test_same_elec) != 0:
for i in range(len(test_same_elec)):
print("Error: An electrode index is used twice at line " + str(test_same_elec[i]+1))
return output
# perform a measurement
def run_measurement(nb_stack, injection_deltat, Rref, coefp0, coefp1):
i2c = busio.I2C(board.SCL, board.SDA) # I2C protocol setup
ads = ADS.ADS1115(i2c, gain=2/3) # I2C communication setup
# inner variable initialization
# GPIO initialization
GPIO.setup(7, GPIO.OUT)
GPIO.setup(8, GPIO.OUT)
# resistance measurement
for n in range(0,3+2*nb_stack-1) :
if (n % 2) == 0:
GPIO.output(7, GPIO.HIGH) # polarité n°1
GPIO.output(7, GPIO.LOW) # polarité n°1 également ?
GPIO.output(8, GPIO.HIGH) # current injection
time.sleep(injection_deltat) # delay depending on current injection duration
Ia1 = AnalogIn(ads,ADS.P0).voltage * coefp0 # reading current value on ADS channel A0
Ib1 = AnalogIn(ads,ADS.P1).voltage * coefp1 # reading current value on ADS channel A1
Vm1 = AnalogIn(ads,ADS.P2).voltage # reading voltage value on ADS channel A2
Vn1 = AnalogIn(ads,ADS.P3).voltage # reading voltage value on ADS channel A3
GPIO.output(8, GPIO.LOW)# stop current injection
I1= (Ia1 - Ib1)/Rref
Vmn1= (Vm1 - Vn1)
if (n % 2) == 0:
# return averaged values
output = pd.DataFrame({
# rajouter les ABMN
return output
# save data
def append_and_save(path, last_measurement):
if os.path.isfile(path):
# Load data file and append data to it
with open(path, 'a') as f:
last_measurement.to_csv(f, header=False)
# create data file and add headers
with open(path, 'a') as f:
last_measurement.to_csv(f, header=True)
Initialization of GPIO channels
......@@ -53,32 +177,26 @@ sequence_delay= 30 # Delay in Second between 2 sequences
stack= 1 # repetition of the current injection for each quadrupole
Reading the quadripole file
Main loop
N=numpy.loadtxt("ABMN.txt", delimiter=" ",dtype=int) # load quadripole file
N=read_quad("ABMN.txt",nb_electrodes) # load quadripole file
for g in range(0,nbr_meas): # for time-lapse monitoring
Selection electrode activées pour chaque quadripole
for i in range(0,N.shape[0]): # boucle sur les quadripôles, qui tient compte du nombre de quadripole dans le fichier ABMN
# call switch_mux function
for i in range(0,N.shape[0]): # loop over quadripoles
# call the switch_mux function to switch to the right electrodes
# run a measurement
current_measurement = run_measurement(stack, injection_duration, R_ref, coef_p0, coef_p1)
# save data and print in a text file
append_and_save(export_path, current_measurement)
# reset multiplexer channels
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(sequence_delay);#waiting next measurement
Save result in txt file
time.sleep(sequence_delay) #waiting next measurement (time-lapse)
\ No newline at end of file
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