GreenPonik_PH.py Library for Raspberry pi

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This is the sample code for Gravity: Analog pH Sensor / Meter Kit V2, SKU:SEN0161-V2

Table of Contents

• ## GreenPonik_PH.py Library for Raspberry pi
• Table of Contents
• Installation
• Methods
• Examples
• Credits

Installation

Dependencies:

The Analog pH Sensor should work with ADS1115 DFRobot_ADS1115

Call modules:

from DFRobot_ADS1115 import ADS1115
from GreenPonik_PH import GreenPonik_PH

or run example directly

$> python3 example/PH_Read.py

Methods

"""
@brief Init The Analog pH Sensor
"""
def begin(self);

"""
@brief Convert voltage to PH
"""
def readPH(self,voltage);

"""
@brief Calibrate the calibration data
"""
def calibration(self,voltage);

"""
@brief Reset the calibration data to default value
"""
def reset(self);

Examples

PH read => PH_Read.py in libs folder

git clone https://github.com/DFRobot/DFRobot_ADS1115.git

import sys
sys.path.insert(0,'libs/DFRobot_ADS1115/RaspberryPi/Python/')
sys.path.insert(0,'libs/GreenPonik_PH_Python/src/')


from DFRobot_ADS1115 import ADS1115
from GreenPonik_PH import GreenPonik_PH

ADS1115_REG_CONFIG_PGA_6_144V = 0x00  # 6.144V range = Gain 2/3
ADS1115_REG_CONFIG_PGA_4_096V = 0x02  # 4.096V range = Gain 1
ADS1115_REG_CONFIG_PGA_2_048V = 0x04  # 2.048V range = Gain 2 (default)
ADS1115_REG_CONFIG_PGA_1_024V = 0x06  # 1.024V range = Gain 4
ADS1115_REG_CONFIG_PGA_0_512V = 0x08  # 0.512V range = Gain 8
ADS1115_REG_CONFIG_PGA_0_256V = 0x0A  # 0.256V range = Gain 16

ads1115 = ADS1115()
ph = GreenPonik_PH()
ph.begin()


def read_ph():
    global ads1115
    global ph
    # Set the IIC address
    ads1115.setAddr_ADS1115(0x48)
    # Sets the gain and input voltage range.
    ads1115.setGain(ADS1115_REG_CONFIG_PGA_6_144V)
    # Get the Digital Value of Analog of selected channel
    adc1 = ads1115.readVoltage(1)
    # Convert voltage to pH
    PH = ph.readPH(adc1['r'])
    print("PH:%.2f " % (PH))
    return PH


while True:
    read_ph()

pH calibration => PH_Calibration.py

in libs folder

git clone https://github.com/DFRobot/DFRobot_ADS1115.git

import sys
sys.path.insert(0,'libs/DFRobot_ADS1115/RaspberryPi/Python/')
sys.path.insert(0,'libs/GreenPonik_PH_Python/src/')

from DFRobot_ADS1115 import ADS1115
from GreenPonik_PH import GreenPonik_PH

ADS1115_REG_CONFIG_PGA_6_144V = 0x00  # 6.144V range = Gain 2/3
ADS1115_REG_CONFIG_PGA_4_096V = 0x02  # 4.096V range = Gain 1
ADS1115_REG_CONFIG_PGA_2_048V = 0x04  # 2.048V range = Gain 2 (default)
ADS1115_REG_CONFIG_PGA_1_024V = 0x06  # 1.024V range = Gain 4
ADS1115_REG_CONFIG_PGA_0_512V = 0x08  # 0.512V range = Gain 8
ADS1115_REG_CONFIG_PGA_0_256V = 0x0A  # 0.256V range = Gain 16

ads1115 = ADS1115()
ph = GreenPonik_PH()
ph.begin()


def calibration():
    global ads1115
    global ph
    # Set the IIC address
    ads1115.setAddr_ADS1115(0x48)
    # Sets the gain and input voltage range.
    ads1115.setGain(ADS1115_REG_CONFIG_PGA_6_144V)
    # Get the Digital Value of Analog of selected channel
    adc1 = ads1115.readVoltage(1)
    return ph.calibration(adc1['r'])


calibration()

read both pH and EC => PH_EC.py

in libs folder

git clone https://github.com/GreenPonik/GreenPonik_EC_Python.git

git clone https://github.com/DFRobot/DFRobot_ADS1115.git

import sys
sys.path.insert(0,'libs/DFRobot_ADS1115/RaspberryPi/Python/')
sys.path.insert(0,'libs/GreenPonik_EC_Python/src/')
sys.path.insert(0,'libs/GreenPonik_PH_Python/src/')


ADS1115_REG_CONFIG_PGA_6_144V        = 0x00 # 6.144V range = Gain 2/3
ADS1115_REG_CONFIG_PGA_4_096V        = 0x02 # 4.096V range = Gain 1
ADS1115_REG_CONFIG_PGA_2_048V        = 0x04 # 2.048V range = Gain 2 (default)
ADS1115_REG_CONFIG_PGA_1_024V        = 0x06 # 1.024V range = Gain 4
ADS1115_REG_CONFIG_PGA_0_512V        = 0x08 # 0.512V range = Gain 8
ADS1115_REG_CONFIG_PGA_0_256V        = 0x0A # 0.256V range = Gain 16

from DFRobot_ADS1115 import ADS1115
from GreenPonik_EC import GreenPonik_EC
from GreenPonik_PH import GreenPonik_PH

ads1115 = ADS1115()
ec      = GreenPonik_EC()
ph      = GreenPonik_PH()

ec.begin()
ph.begin()


def read_ph_ec():
	global ads1115
	global ec
	global ph
	temperature = 25 # or make your own temperature read process
	#Set the IIC address
	ads1115.setAddr_ADS1115(0x48)
	#Sets the gain and input voltage range.
	ads1115.setGain(ADS1115_REG_CONFIG_PGA_6_144V)
	#Get the Digital Value of Analog of selected channel
	adc0 = ads1115.readVoltage(0)
	adc1 = ads1115.readVoltage(1)
	#Convert voltage to EC with temperature compensation
	EC = ec.readEC(adc0['r'],temperature)
	PH = ph.readPH(adc1['r'])
	print("Temperature:%.1f ^C EC:%.2f ms/cm PH:%.2f " %(temperature,EC,PH))
	return temperature, EC, PH


while True:
	read_ph_ec()

Credits

Writter by Mickael Lehoux, from GreenPonik, 2019

based on DFRobot library

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