From b85a5514c937fc95764b4effab1ded356a71caee Mon Sep 17 00:00:00 2001
From: "remi.clement" <remi.clement@irstea.fr>
Date: Sat, 20 Mar 2021 17:11:31 +0100
Subject: [PATCH] Measurement injection correction
---
ABMN.txt | 35 ++++-
Ohmpi.py | 56 +++++--
measurement.csv | 396 +++++++++++++++++++++++++++++++++++++++++++++++
ohmpi_param.json | 4 +-
test.py | 40 +++++
5 files changed, 513 insertions(+), 18 deletions(-)
create mode 100644 test.py
diff --git a/ABMN.txt b/ABMN.txt
index 8aa271ad..6f2126c8 100644
--- a/ABMN.txt
+++ b/ABMN.txt
@@ -1 +1,34 @@
-1 4 2 3
+1 2 3 4
+2 3 4 5
+3 4 5 6
+4 5 6 7
+5 6 7 8
+6 7 8 9
+7 8 9 10
+8 9 10 11
+9 10 11 12
+10 11 12 13
+11 12 13 14
+12 13 14 15
+13 14 15 16
+14 15 16 17
+15 16 17 18
+16 17 18 19
+17 18 19 20
+18 19 20 21
+19 20 21 22
+20 21 22 23
+21 22 23 24
+22 23 24 25
+23 24 25 26
+24 25 26 27
+25 26 27 28
+26 27 28 29
+27 28 29 30
+28 29 30 31
+29 30 31 32
+30 31 32 33
+31 32 33 34
+32 33 34 35
+33 34 35 36
+34 35 36 37
diff --git a/Ohmpi.py b/Ohmpi.py
index 3c7a2ffa..3971cd22 100644
--- a/Ohmpi.py
+++ b/Ohmpi.py
@@ -39,8 +39,6 @@ offset_p3= 0
integer=10
meas=numpy.zeros((3,integer))
-
-
"""
import parameters
"""
@@ -74,7 +72,30 @@ Elec_N= adafruit_tca9548a.TCA9548A(i2c, 0X70)
functions
"""
# 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_on(quadripole):
+ elec_adress=[0x76,0X71,0x74,0x70]
+
+ 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
+
+ mcp2 = MCP23017(tca[nb_i2C])
+ mcp2.get_pin(a-1).direction=digitalio.Direction.OUTPUT
+ mcp2.get_pin(a-1).value=True
+
+def switch_mux_off(quadripole):
elec_adress=[0x76,0X71,0x74,0x70]
for i in range(0,4):
@@ -93,10 +114,10 @@ def switch_mux(quadripole):
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])
+ mcp2 = MCP23017(tca[nb_i2C])
+ mcp2.get_pin(a-1).direction=digitalio.Direction.OUTPUT
+ mcp2.get_pin(a-1).value=False
+
#function to switch off mux
def ZERO_mux(nb_elec):
@@ -118,9 +139,9 @@ def ZERO_mux(nb_elec):
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
+ mcp2 = MCP23017(tca[nb_i2C])
+ mcp2.get_pin(a-1).direction=digitalio.Direction.OUTPUT
+ mcp2.get_pin(a-1).value= False
# function to find rows with identical values in different columns
def find_identical_in_line(array_object):
@@ -144,7 +165,7 @@ def find_identical_in_line(array_object):
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))
+ test_index_elec = numpy.array(numpy.where(output > nb_elec))
# 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)
@@ -165,14 +186,19 @@ def run_measurement(nb_stack, injection_deltat, R_shunt, coefp2, coefp3, elec_ar
sum_I=0
sum_Vmn=0
sum_Ps=0
+ # injection courant and measure
+ mcp = MCP23008(i2c, address=0x20)
+ pin0 = mcp.get_pin(0)
+ pin0.direction = Direction.OUTPUT
+ pin1 = mcp.get_pin(1)
+ pin1.direction = Direction.OUTPUT
pin0.value = False
pin1.value = False
- # injection courant and measure
-
for n in range(0,3+2*nb_stack-1) :
# current injection
if (n % 2) == 0:
+
pin1.value = True
pin0.value = False # current injection polarity n°1
else:
@@ -256,10 +282,10 @@ for g in range(0,pardict.get("nbr_meas")): # for time-lapse monitoring
# call the switch_mux function to switch to the right electrodes
- switch_mux(N[i,])
+ switch_mux_on(N[i,])
# run a measurement
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"))
+ switch_mux_off(N[i,])
#save data and print in a text file
append_and_save(pardict.get("export_path"), current_measurement)
diff --git a/measurement.csv b/measurement.csv
index 70372492..e5948b19 100644
--- a/measurement.csv
+++ b/measurement.csv
@@ -8558,3 +8558,399 @@
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diff --git a/ohmpi_param.json b/ohmpi_param.json
index 9e7e401a..1f5bddeb 100644
--- a/ohmpi_param.json
+++ b/ohmpi_param.json
@@ -1,8 +1,8 @@
{
"nb_electrodes": 64,
- "injection_duration": 0.5,
+ "injection_duration": 0.250,
"nbr_meas": 10000,
- "sequence_delay": 5,
+ "sequence_delay": 0,
"stack": 1,
"export_path": "/home/pi/ohmpi1_5/measurement.csv"
}
diff --git a/test.py b/test.py
new file mode 100644
index 00000000..eb9a3290
--- /dev/null
+++ b/test.py
@@ -0,0 +1,40 @@
+import time , board, busio, numpy, os, sys, json, glob,os.path,adafruit_tca9548a
+import adafruit_ads1x15.ads1115 as ADS
+from adafruit_ads1x15.analog_in import AnalogIn
+from pandas import DataFrame
+from datetime import datetime
+from adafruit_mcp230xx.mcp23008 import MCP23008
+from adafruit_mcp230xx.mcp23017 import MCP23017
+import digitalio
+from digitalio import Direction
+current_time = datetime.now()
+print(current_time.strftime("%Y-%m-%d %H:%M:%S"))
+"""
+hardware parameters
+"""
+R_shunt = 0.2# reference resistance value in ohm
+coef_p2 = 2.50# slope for current conversion for ADS.P2, measurement in V/V
+coef_p3 = 2.50 # slope for current conversion for ADS.P3, measurement in V/V
+offset_p2= 0
+offset_p3= 0
+integer=10
+meas=numpy.zeros((3,integer))
+
+"""
+import parameters
+"""
+
+with open('ohmpi_param.json') as json_file:
+ pardict = json.load(json_file)
+
+
+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
+pin0.value = False
+pin0.value = False
+
--
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