pause puts me in sleep mode

[mister_e]

probably the transistor in use is a digital type with internal resistor or logic mosfet. that's why you don't have any external resisotr.

no resistor on PORTB... probably the internal pull-ups where in use. I bet the pushbutton are between PIC and gnd!

The major cause, as i suspect, might be the current provided by the power supply, must be unsufficient to make the 5 volt line goes to 3.5 volt. Use another power supply.

[EDWARD]

thanks for your response mister_e. i know that the hardware is sufficient for my purposes, but oddly enough the buttons are actually between 5+ and pic,weird.

also, i bought bunch of 9 volts, and still same problem. this only happens when i use the pause command. if the solenoid is programmed to ONLY BE ON WHEN THE BUTTON(on a different port) IS HELD TRUE, it works fine. but if i tell the solenoid to stay high for 1 seconds (PAUSE 1000) the vdd drops to 3.5. dang!

is it possible that some of the power to "help" drive the solenoid and/or PIC, comes from a data port? conversly, will defining (TRISX) to many pins as outputs (not necessarily HIGH), will draw excesive current?

[EDWARD]

ok guys i made a breakthrough of "KFC snacker size" proportions.

OK so im hungry and not funny. but i am gaining on my pause problem.
today i found out that if i short out portc.2 it will "turn off" my solenoid "driver" the only way for the driver to turn fully off is to short it. portc.2 =0 doesnt go low enough.

secondly, i found out how the driver works. my solenoid red wire is connected to a 5+, and the black wire of the solenoid is connected to 2 transitors in parallel. one of the transiters set the sink bias to make the solenoid "driver" at a 4.4 volts on the ground side, even when portc.2 is low. and when portc.2 goes high, it sinks the solenoid over 5+. thereby fireing the solenoid.

This has led me to beliver that when i ground out the portc.2 pin, which in turn turns off the driving transistor, which turns off the solenoid.

that can only mean that when i put portc.2 = 0 it is not going low enough. how do i make portc.2 less than 0 it really wierd cause as soon as i short portc.2 with my vdd goes back up to 5+.

ive tried swapping solenoids and batteries.

[EDWARD]

my pictures are at:
http://pg.photos.yahoo.com/ph/edward...bum?.dir=/6008

yo, i took some pics of my board and put them in a yahoo photo album thing. feel free to check em out. basically it shows the pic, the solenoid/batery harness side and a full view. one of the pictures has a mspaint drawing on it. oh yeah the picture i upside, sry forgot to rotate before i started editing.

BTW i think i figured out my lcd probem that was posted in pbc. ill just have to make my own subs and with all the data you great people have given me it should be a snap (oh here i got being all optimistic again)
thanks to whomever sent me to

(lcd HD44780 commands)
http://www.geocities.com/SiliconVall...d/commands.htm

and
lcd.bas example (it will open browser as txt file if u click it)

http://www.melabs.com/resources/samples/pbc/lcd.bas

[NavMicroSystems]

EDWARD,

could you draw a schematic of the "solenoid-driver" part?
It is still not clear to me what this looks like.

[EDWARD]

ok i tried to make a shcematc for ya. disregard the black box around the circuit if any.

Im not sure if the (B) PNP transistor is in fact a PNP, it could be some weird 3 pin device.

also its werid how there is a 5+ going into the solenoids RED supply and 4.2+ going into the solenoid on the BLACK supply. when i drive the npn base high (portc.2) the solenoid gets "stuck on" the 4.4 that was present on the BLACK is now 0vdc. and the RED is at 3.5 vdc, meaning the vdd is at 3.5.

even if i drive the portc.2 LOW the transistor stays on cause the board has "crashed". now i cant read the voltage at the transistor base because when i put the (my multimeter) black probe on the battery ground and the red probe
on the NPN base it drives the base Low making te solenoid turn off, and putting 5+ back on the VDD, thereby reseting the pic to the top of the program. if i disconnect the solenoid, i get all the expected reading at the expected times, e.g. portc.2 will actully out a 5+ vdc when i tell it to and 0vdc when i tell it too.

lastly, im telling you there is not a harware problem, power supply problem, solenoid problem. i have tested all my parts on another board, that still has the old code, and they work.

[Warrier]

Hi:

Looking at your schematic a few things can be explained:

The B transistor is connected as a forward biased diode! It drops about 0.6v and hence you see 4.4volt on the black wire of the solenoid.

When A transistor is turned on by taking portc.2 hi, it shorts out this diode to ground and very little current will flow through the solenoid! In fact voltage across it cannot exceed more than the Vce of the B transistor.

Since this is a functional board I have to assume that this configuration cannot be correct... The 5volt regulator usually drops about 1.5volts across it.

When the solenoid is ON (Vdd goes down to 3.5v as you note) the regulator output is being short circuited and it may be going into a voltage foldback current limit mode.

I have to assume that the LED works because you have a series resistor and LED takes only a few mA to turn on and the 5v regulator is able to supply that.

You can do two things:
1. Remove B transistor and replace it with a diode (1N4148 or 1N4001) with its cathode connected to the red wire of the solenoid (+5v)
2. Connect a capacitor (100uF) between the output of regulator and ground - if this is not already in the circuit.

I don't think it has anything to do with your code or the PIC. Of course you can clean it up by not using so many GoTo statements.

As for transistor A, as Steve correctly points out it may be a digital version (base resistors are built in). You can verify this by looking at the voltage on portc.2 when it goes hi - if it is close to 5v then the transistor is a digital type. Otherwise portc.2 will only go upto 0.6volt. In latter case you must add a 1k between portc.2 and the base of this transisitor.

hope these are helpful

-warrier

[NavMicroSystems]

Im not sure if the (B) PNP transistor is in fact a PNP, it could be some weird 3 pin device.

I would assume (B) is a Diode in a three pin package.
(Cathode should be connected to the red wire of the solenoid, anode to the black wire.
Is there any SMD code printed on it?

also its weird how there is a 5+ going into the solenoids RED supply and 4.2+ going into the solenoid on the BLACK supply.

with the NPNs (A) base low there is a voltage drop of about 0.8V accross the solenoid, this means there must be something else connected to the NPNs collector that is drawing current.

when i drive the npn base high (portc.2) the solenoid gets "stuck on" the 4.4 that was present on the BLACK is now 0vdc. and the RED is at 3.5 vdc, meaning the vdd is at 3.5.

looks like the solenoid draws more power than the Vreg can deliver, that causes the voltage drop at the Vreg's output.

even if i drive the portc.2 LOW the transistor stays on cause the board has "crashed".

If the transistor stays on, the base isn't low !

now i cant read the voltage at the transistor base because when i put the (my multimeter) black probe on the battery ground and the red probe
on the NPN base it drives the base Low making te solenoid turn off, and putting 5+ back on the VDD, thereby reseting the pic to the top of the program. if i disconnect the solenoid, i get all the expected reading at the expected times, e.g. portc.2 will actully out a 5+ vdc when i tell it to and 0vdc when i tell it too.

Questions:
1. what is the resistance of the solenoid?
2. what kind of multimeter are you using and what is it's input resistance in the voltage range you have selected?

lastly, im telling you there is not a harware problem, power supply problem, solenoid problem. i have tested all my parts on another board, that still has the old code, and they work.

are you really sure the schematic matches the board?