Way

[Bruce]

Is rpm less than or equal to 3 when it doesn't work?

[jetpr]

This work
if (RPM > 3) then
low Estarter
else
high Estarter
pause 100
endif

this no work

if (RPM <= 3) then (when is less the 3)
high Estarter
pause 100
low Estarter
endif

[mackrackit]

IF THEN with out an else has to have the THEN condition on the same line. This should work assuming "Estarter" is a Label or Statement.

if (RPM <= 3) then high Estarter
pause 100
low Estarter

[Bruce]

It should work fine as-is, but if you expect to see the LED blink, you would probably
want a short pause after each logic state change.

I.E.;

RPM VAR BYTE
SYMBOL Estarter = PORTB.0
PORTB.0=0
TRISB.0=0

Main:
    for RPM = 0 TO 255
    if (RPM > 3) then
      low Estarter
      pause 100
    else
      high Estarter
      pause 100
    endif

    if (RPM <= 3) then
      high Estarter
      pause 100
      low Estarter
      pause 100
    endif
    next RPM
    goto Main
    
    END

This definitely works. LED blinks 4 times on each pass through the loop.