This program demonstrates how to use a formula to scale the voltage measured on AIN0.

LJ - 09.100 - convert_AIN_with_function.lua

--[[
LJ - 09.100 - convert_AIN_with_function.lua

This program demonstrates how to use a formula to scale the voltage
measured on AIN0.

Components
----------

- LabJack T4
- Potentiometer
  - Midlle pin to AIN0
  - Left pin to VS
  - Right pin to GND
- Wires
- Breadboard

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

--]]

-- If we are not running on a T4, stop the script.
devType = MB.R(60000, 3)
if devType ~= 4 then
	print("Device is not a T4")
	MB.W(6000, 1, 0);
end

-- Set up a 1 second timer
LJ.IntervalConfig(0, 1000)

-- define used variables.
local ainVal = 0
local dacVal = 0

function convert_ain(ain_value)
  return ain_value * 1.5
end

-- Enter a permanent while loop
while true do
	if LJ.CheckInterval(0) then -- Interval completed.
		-- Read AIN0
		ainVal = MB.R(0, 3)

		-- Make sure the AIN0 value is between 0V and 5V
		dacVal = ainVal
		if(ainVal > 5) then
		  dacVal = 5
		end
		if(ainVal < 0) then
		  dacVal = 0
		end

		-- Convert value (voltage) from AIN0 to something else based on a formula.
		-- This simulates converting a thermocouple signal to temperature.
		temp_C = convert_ain(ainVal) -- I've made up this formula

		print("Temperature in C:", temp_C)
		print("Voltage at AIN0:", ainVal)

	end
end