update

Ohmpi_4elec.py

@@ -12,7 +12,7 @@ print('\ \_/ / | | || |  | || |    _| |_')
 print(' \___/\_| |_/\_|  |_/\_|    \___/ ')
 print('\033[0m')
 print('OhmPi 4 elec  start' )
-print('Vers: 1.00')
+print('Vers: 1.01')
 print('Import library')
 
 
@@ -24,6 +24,7 @@ from pandas import DataFrame
 from datetime import datetime
 from adafruit_mcp230xx.mcp23008 import MCP23008
 from adafruit_mcp230xx.mcp23017 import MCP23017
+from termcolor import colored
 import digitalio
 from digitalio import Direction
 from gpiozero import CPUTemperature
@@ -33,6 +34,8 @@ print(current_time.strftime("%Y-%m-%d %H:%M:%S"))
 hardware parameters
 """
 R_shunt = 2# reference resistance value in ohm
+Imax=4800/50/2
+print(colored(('The maximum current cannot be higher than ',Imax, 'mA'), 'red'))
 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
@@ -50,8 +53,8 @@ with open('ohmpi_param.json') as 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=2/3,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 voltage
+ads_current = ADS.ADS1115(i2c, gain=2/3,data_rate=128, address=0X48)# connexion ADS1115, pour la mesure de courant
+ads_voltage = ADS.ADS1115(i2c, gain=2/3,data_rate=128, address=0X49)# connexion ADS1115, pour la mesure de voltage
 #initialisation desvoie pour la polarité
 pin0 = mcp.get_pin(0)
 pin0.direction = Direction.OUTPUT

ohmpi_param.json

 {
     "nb_electrodes": 64,
-    "injection_duration": 4,
+    "injection_duration":0.2,
     "nbr_meas": 100,
     "sequence_delay": 1,
     "stack": 1,
-    "export_path": "/home/pi/ohmpi/ohmpi/master/measurement.csv" 
+    "export_path": "/home/pi/Documents/OhmPi/measurement.csv" 
 }

requirements.txt

@@ -3,6 +3,7 @@ libraries to install using the package manager : libatlas-base-dev
 python libraries dependencies :
 Adafruit-Blinka==3.2.0
 adafruit-circuitpython-ads1x15==2.1.1
+adafruit-circuitpython-mcp230xx==2.5.1
 adafruit-circuitpython-busdevice==4.0.1
 Adafruit-PlatformDetect==1.3.8
 adafruit-circuitpython-tca9548a==0.5.1

test_mux_board.py

+"""
+Created on Tue Dec  7 06:39:33 2021 
+Code for testing switch MUX for ohmpi 2 
+@author: remi.clement 
+"""
+
+import time , board, busio,adafruit_tca9548a 
+from adafruit_mcp230xx.mcp23017 import MCP23017 
+import digitalio
+from digitalio import Direction
+
+
+address=0X70# choose the mux board address 
+activation_time=1 # choose your activation time in second 
+
+
+i2c = busio.I2C(board.SCL, board.SDA) #activation du protocle I2C 
+def switch_mux_on(electrode,address):
+    tca= adafruit_tca9548a.TCA9548A(i2c, address)
+    if electrode < 17: 
+        nb_i2C=7 
+        a=electrode 
+    elif electrode > 16 and electrode< 33:     
+        nb_i2C=6 
+        a=electrode-16 
+    elif electrode > 32 and electrode < 49:     
+        nb_i2C=5 
+        a=electrode-32 
+    elif electrode > 48 and electrode < 65:     
+        nb_i2C=4 
+        a=electrode-48 
+               
+    mcp2 = MCP23017(tca[nb_i2C]) 
+    mcp2.get_pin(a-1).direction=Direction.OUTPUT 
+    mcp2.get_pin(a-1).value=True 
+  
+def switch_mux_off(electrode,address): 
+    tca= adafruit_tca9548a.TCA9548A(i2c, address) 
+    if electrode < 17: 
+        nb_i2C=7 
+        a=electrode 
+    elif electrode > 16 and electrode < 33:     
+        nb_i2C=6 
+        a=electrode-16 
+    elif electrode > 32 and electrode < 49:     
+        nb_i2C=5
+        
+        a=electrode-32 
+    elif electrode > 48 and electrode < 65:     
+        nb_i2C=4 
+        a=electrode-48 
+           
+    mcp2 = MCP23017(tca[nb_i2C])      
+    mcp2.get_pin(a-1).direction=digitalio.Direction.OUTPUT 
+    mcp2.get_pin(a-1).value=False 
+ 
+a=input(' if vous want try 1 channel choose 1, if you want try all channel choose 2!') 
+ 
+if a=='1': 
+    b=0 
+    print ("run channel by channel test") 
+    electrode=int(input(' Choose your electrode number (integer):')) 
+    switch_mux_on(electrode,address) 
+    print('electrode:',electrode,' activate' ) 
+    time.sleep(activation_time) 
+    switch_mux_off(electrode,address) 
+    print('electrode:',electrode,' deactivate' ) 
+     
+if a== '2': 
+    for electrode in range(1, 65): 
+        switch_mux_on(electrode,address) 
+        print('electrode:',electrode,' activate' ) 
+        time.sleep(activation_time) 
+        switch_mux_off(electrode,address) 
+        print('electrode:',electrode,' deactivate' ) 
+        time.sleep(activation_time) 
+if a not in ['1', '2']: 
+    print ("Wrong choice !")