This script shows how to write voltage to DAC0.

LJ - 10.40 - LJ - 10.40 - DAC0_write.py

'''
LJ - 10.40 - LJ - 10.40 - DAC0_write.py

This script shows how to write voltage to DAC0.

Components
----------

- LabJack T4
- Voltmeter/Multimeter
  - Multimeter red probe to DAC0
  - Multimeter black probe to GND

Course
------
Data acquisition and automation with LabJack
https://app.techexplorations.com/courses/labjack/

'''

from labjack import ljm
import time

# Open first found LabJack
handle = ljm.openS("ANY", "ANY", "Peter_T4")

info = ljm.getHandleInfo(handle)
print("Opened a LabJack with Device type: %i, Connection type: %i,\n"
      "Serial number: %i, IP address: %s, Port: %i,\nMax bytes per MB: %i" %
      (info[0], info[1], info[2], ljm.numberToIP(info[3]), info[4], info[5]))

# Setup and call eWriteAddress to write a value to the LabJack.
address = 1000  # DAC0
dataType = ljm.constants.FLOAT32
value = 2.0  # 2.5 V
step = 0.5

while True:
    value = value + step
    ljm.eWriteAddress(handle, address, dataType, value)
    if value > 4 or value < 0:
        step = - step

    print("\neWriteAddress: ")
    print("    Address - %i, data type - %i, value : %f" % (address, dataType, value))
    time.sleep(3) # Sleep for 3 seconds to allow enough time for the voltage to stabilize

# Close handle
ljm.close(handle)