Skip to main content
Set analog voltage outputs using DAC pins. Supports LabJack T7 and MCC USB-202 hardware.

​
Import

from lager import Net, NetType

​
Methods

MethodDescription
output(voltage)Set analog output voltage
get_voltage()Read configured output voltage
input()Alias for get_voltage()

​
Method Reference

​
Net.get(name, type=NetType.DAC)

Get a DAC net by name. 
from lager import Net, NetType

dac = Net.get('VREF', type=NetType.DAC)
Parameters:
ParameterTypeDescription
namestrName of the DAC net
typeNetTypeMust be NetType.DAC
Returns: DAC Net instance

​
output(voltage)

Set the analog output voltage. 
dac.output(2.5)  # Set to 2.5V
ParameterTypeDescription
voltagefloatOutput voltage in volts

​
get_voltage()

Read the currently configured output voltage. 
v = dac.get_voltage()
print(f"DAC set to: {v}V")
Returns: float - Configured voltage in volts

​
input()

Alias for get_voltage(). Returns the currently configured output voltage. 
v = dac.input()
print(f"DAC output: {v}V")
Returns: float - Configured voltage in volts

​
Examples

​
Set Reference Voltage

from lager import Net, NetType

vref = Net.get('VREF', type=NetType.DAC)
vref.output(1.8)  # Set to 1.8V

​
Generate Ramp Signal

from lager import Net, NetType
import time

signal = Net.get('SIGNAL_OUT', type=NetType.DAC)

# Ramp from 0 to 5V in 0.5V steps
for v in range(0, 51, 5):
    voltage = v / 10.0
    signal.output(voltage)
    print(f"Output: {voltage}V")
    time.sleep(0.1)

​
Voltage Sweep Test

from lager import Net, NetType
import time

control = Net.get('CONTROL', type=NetType.DAC)
sensor = Net.get('RESPONSE', type=NetType.ADC)

# Sweep control voltage and measure response
for mv in range(0, 3301, 100):
    voltage = mv / 1000.0
    control.output(voltage)
    time.sleep(0.1)  # Settling time

    response = sensor.input()
    print(f"Control: {voltage:.2f}V, Response: {response:.3f}V")

​
Set and Verify

from lager import Net, NetType

dac = Net.get('ANALOG_OUT', type=NetType.DAC)

# Set output
dac.output(3.3)

# Read back to verify
readback = dac.get_voltage()
print(f"Set: 3.3V, Readback: {readback}V")

​
Supported Hardware

HardwareChannelsRange
LabJack T7DAC0-DAC10-10 V
MCC USB-202AOUT0-AOUT10-5 V

​
Pin Naming

LabJack T7:
Pin InputChannel
0-1DAC0-DAC1
"DAC0"-"DAC1"DAC0-DAC1
MCC USB-202:
Pin InputChannel
0-1AOUT0-AOUT1
"DAC0"-"DAC1"AOUT0-AOUT1
"AOUT0"-"AOUT1"AOUT0-AOUT1

​
Notes

  • DAC nets work directly without enable()/disable() calls
  • LabJack T7 output range: 0-10 V
  • USB-202 output range: 0-5 V
  • input() is an alias for get_voltage() and returns the configured output value
  • Output values are maintained until changed or power cycle
  • Net names must match those configured on the Lager Box