Differential Sample

This sample demonstrates measuring differential analog inputs from analog pads.

To run the sample:

1. Download the sample code from https://github.com/Turta-io/Proto-HAT/blob/master/Samples/Python/analog_differential.py

2. Copy the sample code to a folder on the Raspberry Pi.

3. Open terminal, and then go to the folder you copied the sample.

4. Run the sample with the following command:

python3 analog_differential.py

Sample Code

analog_differential.py

#!/usr/bin/env python3

#This sample demonstrates measuring differential analog inputs from analog pads.
#Install Proto HAT library with "pip3 install turta-protohat"

#Raspberry Pi Configuration
# - You should enable SPI and I2C from the Raspberry Pi's configuration.
# To do so, type 'sudo raspi-config' to the terminal, then go to 'Interfacing Options' and enable both SPI and I2C.

from time import sleep
from turta_protohat import Turta_Analog

#Initialize
analog = Turta_Analog.ADC()

try:
    while True:
        #Read differential input on pads 1 and 2
        a1_2 = analog.read(Turta_Analog.CH.DIFFERENTIAL_1_2)

        #Read differential input on pads 3 and 4
        a3_4 = analog.read(Turta_Analog.CH.DIFFERENTIAL_3_4)

        #Read board temperature
        board_temp_c = analog.read_temperature()
        board_temp_f = analog.read_temperature(True)

        #Print the readings
        print("Analog Input 1-2: " + str(a1_2))
        print("Analog Input 3-4: " + str(a3_4))
        print("Board Temp......: " + str(round(board_temp_c, 1)) + "C" + \
              " / " + str(round(board_temp_f, 1)) + "F")

        #Wait
        print("-----")
        sleep(0.5)

#Exit on CTRL+C
except KeyboardInterrupt:
    print('Bye.')

Result

When you run the sample, it prints differential analog measurements from analog pads 1-2 and 3-4. The example output should be like this:

Analog Input 1-2: 0
Analog Input 3-4: 0
Board Temp......: 0C / 0F
-----

To stop the Python script, just press CTRL + C.