Help! My 2003 Bot compressor won't shut off

[Jack21]

Originally Posted by Noah

well, it depends on your code. This might help:

rc_sw1		VAR rc_swA.bit0		'Pin 1
rc_sw2		VAR rc_swA.bit1		'Pin 2
rc_sw3		VAR rc_swA.bit2		'Pin 15
rc_sw4		VAR rc_swA.bit3		'Pin 16
rc_sw5		VAR rc_swA.bit4		'Pin 4
rc_sw6		VAR rc_swA.bit5		'Pin 5
rc_sw7		VAR rc_swA.bit6		'Pin 18
rc_sw8		VAR rc_swA.bit7		'Pin 19
rc_sw9		VAR rc_swB.bit0		'Pin 7
rc_sw10		VAR rc_swB.bit1		'Pin 8
rc_sw11		VAR rc_swB.bit2		'Pin 21
rc_sw12		VAR rc_swB.bit3		'Pin 22
rc_sw13		VAR rc_swB.bit4		'Pin 10
rc_sw14		VAR rc_swB.bit5		'Pin 11
rc_sw15		VAR rc_swB.bit6		'Pin 24
rc_sw16		VAR rc_swB.bit7		'Pin 25

All other pins are ground.

If you can post the code that controls the compressor, I can tell you how to fix it if you know which pin you are plugged into now. (You also have to give me the alias deifinitions of any aliases used in the code)

Well... this is like a foreign language to me.. I have no idea what code is in the controller. I know the cut off switch is wired to the top row of pins 2and on the digital input and the 3 wire cable is attached to the #3 set of pins from on the relay outputs. Is there a way to connect this thing to the computer and reset the default code?
appreciate you help.

[Bduggan04]

Although it is not the most elegant solution, you can still run without the shutoff for presentations. If you can't get it fixed before a presentation, the overload valve should keep the pressure below 135psi. Note: you can not do this in the competion and should really try to fix it, but hey, if your team needs money...

[RoboCoder]

since you're talking about last year's bot, I am assuming you are using last year's control system, and last years programming language (PBASIC). if this is the case, then add these lines to your code, just before the serout command:

select rc_sw2

case 1

relay3_fwd = 1

relay3_rev = 0

case 0

relay3_fwd = 0
relay3_rev = 1

endselect


this is assuming that the pressure switch is normally closed (when 120 psi has NOT been reached). If the compressor doesnt turn on at all, swap the lines "case 1" and "case 0". hope this helps!

[Alan Anderson]

Originally Posted by RoboCoder

select rc_sw2
  case 1
    relay3_fwd = 1
    relay3_rev = 0
  case 0
    relay3_fwd = 0
    relay3_rev = 1
endselect

this is assuming that the pressure switch is normally closed (when 120 psi has NOT been reached). If the compressor doesnt turn on at all, swap the lines "case 1" and "case 0". hope this helps!

I don't think applying reverse polarity to a compressor will shut it off. The last line before the endselect should probably say relay3_rev = 0, setting both wires to the compressor to ground.

[Greg McCoy]

Originally Posted by Alan Anderson

I don't think applying reverse polarity to a compressor will shut it off. The last line before the endselect should probably say relay3_rev = 0, setting both wires to the compressor to ground.

Yeah, I believe this is your problem. You want the output of the spike to be zero, rather than -12 volts