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Read analog voltage values from ADC pins. Supports LabJack T7 and MCC USB-202 hardware.

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Import

from lager import Net, NetType

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Methods

MethodDescription
input()Read analog voltage

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Method Reference

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Net.get(name, type=NetType.ADC)

Get an ADC net by name. 
from lager import Net, NetType

adc = Net.get('SENSOR', type=NetType.ADC)
Parameters:
ParameterTypeDescription
namestrName of the ADC net
typeNetTypeMust be NetType.ADC
Returns: ADC Net instance

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input()

Read the analog voltage. 
voltage = adc.input()
print(f"Voltage: {voltage}V")
Returns: float - Voltage in volts

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Examples

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Single Reading

from lager import Net, NetType

sensor = Net.get('TEMP_SENSOR', type=NetType.ADC)
voltage = sensor.input()
print(f"Sensor voltage: {voltage:.3f}V")

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Continuous Monitoring

from lager import Net, NetType
import time

battery = Net.get('BATTERY_SENSE', type=NetType.ADC)

for i in range(10):
    voltage = battery.input()
    print(f"Battery: {voltage:.2f}V")
    time.sleep(1)

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Data Logging

from lager import Net, NetType
import time
import csv

sensor = Net.get('CURRENT_SENSE', type=NetType.ADC)

with open('readings.csv', 'w', newline='') as f:
    writer = csv.writer(f)
    writer.writerow(['time', 'voltage'])

    start = time.time()
    for i in range(100):
        elapsed = time.time() - start
        voltage = sensor.input()
        writer.writerow([elapsed, voltage])
        time.sleep(0.1)

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Multiple Sensors

from lager import Net, NetType

sensors = {
    'TEMP': Net.get('TEMP_SENSOR', type=NetType.ADC),
    'CURRENT': Net.get('CURRENT_SENSE', type=NetType.ADC),
    'BATTERY': Net.get('BATTERY_SENSE', type=NetType.ADC),
}

for name, sensor in sensors.items():
    voltage = sensor.input()
    print(f"{name}: {voltage:.3f}V")

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Supported Hardware

HardwareChannelsRangeResolution
LabJack T714 (AIN0-AIN13)+/-10 V16-bit (~0.3 mV/LSB)
MCC USB-2028 (CH0-CH7)+/-10 V12-bit (~4.9 mV/LSB)
Both devices support bipolar measurement (positive and negative voltages).

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Pin Naming

LabJack T7:
Pin InputChannel
0-13AIN0-AIN13
"AIN0"-"AIN13"AIN0-AIN13
MCC USB-202:
Pin InputChannel
0-7CH0-CH7
"CH0"-"CH7"CH0-CH7 (case-insensitive)

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Notes

  • ADC nets work directly without enable()/disable() calls
  • Returns voltage as a float in volts
  • Both devices have a +/-10 V input range (bipolar)
  • LabJack T7 shares a connection handle with DAC, GPIO, and SPI operations
  • USB-202 opens and closes the connection on each read
  • Net names must match those configured on the Lager Box