class Device_ABE_DeltaSigmaPiADC:
"""
https://github.com/abelectronicsuk/ABElectronics_Python_Libraries
"""
def __init__(self,
bus=None,
address=None,
address2=None,
samplerate=None,
gain=None):
from ABE_helpers import ABEHelpers
from ABE_ADCDifferentialPi import ADCDifferentialPi
if bus is None:
i2c_helper = ABEHelpers()
bus = i2c_helper.get_smbus()
# Initialize the ADC device using the default addresses and sample rate 18.
# Sample rate can be 12, 14, 16 or 18.
self.adc = ADCDifferentialPi(bus,
address=address,
address2=address2,
rate=samplerate)
# Set amplifier gain to 8.
if gain is not None:
self.adc.set_pga(gain)
def read(self, channel):
# Returns the voltage from the selected ADC channel - channels 1 to 8.
return self.adc.read_voltage(channel)
def StrainGauge():
text_file = open("strainGuage_Data.txt", "w")
i2c_helper = ABEHelpers()
bus = i2c_helper.get_smbus()
adc = ADCDifferentialPi(bus, i2cAddr1, i2cAddr2, bitRate)
adc.set_pga(
1) # Set the gain of the PDA on the chip (Parameters: gain - 1,2,4,8)
prev_voltage = 0
for i in range(10000):
voltage = adc.read_voltage(channel) # voltage output from strain Gauge
changeInVoltage = voltage - prev_voltage
prev_voltage = voltage
#print( str(changeInVoltage * 1000) )
text_file.write(str(voltage) + "\n")
