Links

Differential Sample

This sample demonstrates measuring differential analog inputs from analog pads.

To run the sample:

  1. 2.
    Copy the sample code to a folder on the Raspberry Pi.
  2. 3.
    Open terminal, and then go to the folder you copied the sample.
  3. 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.