def __init__(self):
'''
Initialise ADC-DAC Pi. The DAC gain factor is set to 1, which allows
the DAC output voltage to be set between 0 and 2.048 V. The DAC gain
factor may also be set to 2, which gives an output range of 0 to 3.3 V.
'''
# Create instance of ADCDACPi, with gain set to 1
self.adcdac = ADCDACPi(1)
# Set reference voltage to 3.3 V
self.adcdac.set_adc_refvoltage(3.3)
return
#!/usr/bin/python
from ABE_ADCDACPi import ADCDACPi
import time
"""
================================================
ABElectronics ADCDAC Pi 2-Channel ADC, 2-Channel DAC | DAC Write Demo
Version 1.0 Created 17/05/2014
Version 1.1 16/11/2014 updated code and functions to PEP8 format
run with: python demo-dacwrite.py
================================================
this demo will generate a 1.5V p-p square wave at 1Hz
"""
adcdac = ADCDACPi()
while True:
adcdac.set_dac_voltage(1, 1.5) # set the voltage on channel 1 to 1.5V
time.sleep(0.5) # wait 0.5 seconds
adcdac.set_dac_voltage(1, 0) # set the voltage on channel 1 to 0V
time.sleep(0.5) # wait 0.5 seconds
#!/usr/bin/python
from ABE_ADCDACPi import ADCDACPi
import time
"""
================================================
ABElectronics ADCDAC Pi 2-Channel ADC, 2-Channel DAC | ADC Read Demo
Version 1.0 Created 17/05/2014
Version 1.1 16/11/2014 updated code and functions to PEP8 format
run with: python demo-adcread.py
================================================
this demo reads the voltage from channel 1 on the ADC inputs
"""
adcdac = ADCDACPi(
1) # create an instance of the ADCDAC Pi with a DAC gain set to 1
# set the reference voltage. this should be set to the exact voltage
# measured on the raspberry pi 3.3V rail.
adcdac.set_adc_refvoltage(3.3)
while True:
# read the voltage from channel 1 and display on the screen
print adcdac.read_adc_voltage(1)
time.sleep(0.5)
#!/usr/bin/python3
from ABE_ADCDACPi import ADCDACPi
import time
"""
================================================
ABElectronics ADCDAC Pi 2-Channel ADC, 2-Channel DAC | ADC Read Demo
Version 1.0 Created 29/02/2015
run with: python3 demo-adcread.py
================================================
this demo reads the voltage from channel 1 on the ADC inputs
"""
adcdac = ADCDACPi() # create an instance of ADCDACPi
# set the reference voltage. this should be set to the exact voltage
# measured on the raspberry pi 3.3V rail.
adcdac.set_adc_refvoltage(3.3)
while True:
# read the voltage from channel 1 in single ended mode and display on the screen
print(adcdac.read_adc_voltage(1, 0))
time.sleep(0.5)
def __init__(self, channel, fullrange, voltagespan):
self.channel = channel
self.fullrange = fullrange
self.voltagespan = voltagespan
self.daq = ADCDACPi() # create an instance of ADCDACPi
self.daq.set_adc_refvoltage(3.3)
def main(args):
user_input = sys.argv
startV = float(user_input[1])
maxV = float(user_input[2])
# lowV = float(user_input[3])
# endV = float(user_input[4])
print("User has typed in : %s" %user_input)
print("Test starts at %.3f volts" %startV)
print("Test peaks at %.3f volts" %maxV)
# initialize
adcdac = ADCDACPi(1) # create an instance of the ADCDAC Pi with a DAC gain set to 1
adcdac.set_adc_refvoltage(3.3) # powered off 3.3V GPIO rail
# TODO: add in sample number
csv_filename, test_csv = open_csv(1)
# Hardware settings/references
shunt_resistor = 10 # 10 Ohms
# High-Side Current Monitor IC
gain = 500
# DAC Vref = 2.048v internal
# ADC Vref = Vdd = 3.3v
# start test
raw_input("Press [Enter] to view Conditions")
adcdac.set_dac_voltage(1, startV) # set the voltage on channel 1
voltage = startV
# 1mV increments
# init = int(startV*1000)
# peak = int(maxV*1000)
# 10mV increments
init = int(startV*100)
peak = int(maxV*100)
count = 0
print("START is %0.3f VOLTS" %voltage)
print("HIGH is %0.3f VOLTS" %maxV)
print("INIT is %0.3f UNITS" %init)
print("PEAK is %0.3f UNITS" %peak)
raw_input("Press [Enter] to begin the test")
# ramp up
for i in range (init, peak, 1):
adcdac.set_dac_voltage(1, voltage)
# read channel 1 in single ended mode
voltage_reading = adcdac.read_adc_voltage(1, 0)
#print("%0.3f counts" %i)
# Vdrop @ shunt = voltage_reading/gain
# Current = Vdrop/Rshunt
calc_current = (voltage_reading/gain)/shunt_resistor
print("%.3f volts driven, %.3f volts seen" %(voltage, voltage_reading))
print("Calculated current is %.5f mA \n" %(calc_current*1000))
#save test results
count = count + 1
test_csv.write("%d, %.3f, %.3f, %s\n" %(count, voltage, voltage_reading, calc_current))
voltage = voltage+0.01
time.sleep(0.040)
# ramp down
for i in range (peak, init-1, -1):
adcdac.set_dac_voltage(1, voltage)
# read channel 1 in single ended mode
voltage_reading = adcdac.read_adc_voltage(1, 0)
#print("%0.3f counts" %i)
calc_current = (voltage_reading/gain)/shunt_resistor
print("%.3f volts driven, %.3f volts seen" %(voltage, voltage_reading))
print("Calculated current is %.5f mA \n" %(calc_current*1000))
#save test results
count = count + 1
test_csv.write("%d, %.3f, %.3f, %s\n" %(count, voltage, voltage_reading, calc_current))
voltage = voltage-0.01
time.sleep(0.040)
raw_input("press [Enter] to set DAC to 0 volts")
adcdac.set_dac_voltage(1, 0)
test_csv.close()
upload_file(csv_filename)
