In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

Your code examples are not exactly the same; in the SX version you are presuming you will get an RCTIME of 0 -- seems unlikely as there will probably always be *some* capacitance.

Your Stamp code debugs out the value; for the SX, use WATCH and then run the program in DEBUG mode with your Key connected. Then try it out and see what values you get for various light intensities -- once you have a decent threshold number established, then you can have an LED turn on and off based on that threshold

[code]
'PWM.SXB
DEVICE         SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ         4_000_000

led2 PIN RB.2
led1 PIN RB.1
led7 PIN RB.7
light VAR Word
time CON 2000

someThreshold CON 100 ' or whatever a good number ends up being

WATCH light

'Code

PROGRAM Start
Start:

led1 = 1
led2 = 0
DO
  OUTPUT led2
  OUTPUT led1

  RCTIME led1, 1, light

  IF light < SomeThreshold  THEN 
    led7 = 1 
  ELSE 
    led7 = 0
  ENDIF

PAUSE time
LOOP
[/code]

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