require "ad4"
require "ad4_defines"

major, minor, build = ad4.get_version()		-- Read Version/Buld Number
print("Major Version =", major)
print("Minor Version =", minor)
print("Build =", build)

x = ad4.open("usb-ad")
if x == -1 then
  print("Error")
else
 print("USB-AD opened.")
end

ret, volt = ad4.analog_in(x, An3, Range) 		-- Read Channel An3, Range +/- 5 V
print("Voltage =", volt)

x = ad4.close(x)
if x == 0 then
  print("USB-AD closed.")
else
  print("Error")
end