DAC

Control digital-to-analog converter outputs

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

Import

from lager import Net, NetType

Methods

Method	Description
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:

Parameter	Type	Description
name	str	Name of the DAC net
type	NetType	Must be NetType.DAC

Returns: DAC Net instance

output(voltage)

Set the analog output voltage.

dac.output(2.5)  # Set to 2.5V

Parameter	Type	Description
voltage	float	Output 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

Hardware	Channels	Range
LabJack T7	DAC0-DAC1	0-10 V
MCC USB-202	AOUT0-AOUT1	0-5 V

Pin Naming

LabJack T7:

Pin Input	Channel
0-1	DAC0-DAC1
"DAC0"-"DAC1"	DAC0-DAC1

MCC USB-202:

Pin Input	Channel
0-1	AOUT0-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