This program demonstrates how to use digital lines as simple counters.

LJ - 09.80 - counter_no_debouncing.lua

--[[
LJ - 09.80 - counter_no_debouncing.lua

This program demonstrates how to use digital lines as simple counters.
This script is a simplified version of the one at
https://labjack.com/support/software/examples/lua-scripting/counter-examples/23-counters
This script demonstrates how to create a simple counter on FIO4.

Components
----------

- LabJack T4
- Momentary button
  - Pin 1 to GND
  - Pin 2 to FIO4
- Wires
- Breadboard

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

--]]

print("Create and read a counter on FIO4.")
print("Connect a button to FIO4 and GND.")

local mbRead  = MB.R               --Local functions for faster processing
local mbWrite = MB.W

--1 = Rising edge, 0 = falling
local edge     = 0

local bits     = 0
local bits_new = 99
local count    = 0

--The throttle setting can correspond roughly with the length of the Lua
--script. A rule of thumb for deciding a throttle setting is
--throttle = (3*NumLinesCode) + 20
local throttleSetting = 100    --Default throttle setting is 10 instructions
LJ.setLuaThrottle(throttleSetting)
local throttleSetting = LJ.getLuaThrottle()
print ("Current Lua Throttle Setting: ", throttleSetting)

while true do
  bits_new = mbRead(2004, 0)   -- Read FIO4, this will return 0 or 1

  --Compare bits_new to bits
    if bits ~= bits_new then

      if edge == 1 then
        if bits == 0 then
          count = count + 1
          print (" Rising total: ", count)
        end
      else
        if bits == 1 then
          count = count + 1
          print (" Falling total: ", count)
        end
      end

      bits = bits_new
      mbWrite(46000, 3, count) --Save in User RAM
    end
end