Darken Ship - via ARMstamp

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olzeke51
Posts: 414
Joined: Sat May 17, 2014 4:22 pm
Location: South Carolina

Darken Ship - via ARMstamp

Post by olzeke51 »

My man-cave has a 'submarine' motif. As a Navy Airdale that spent time on carriers,
you get used to setting different 'integrity conditions' - ie various 'General Quarters'.
One of them was to "Darken Ship" - meaning to go to RED lights for exterior openings.
'
I found the Proto-24 on sale from pcboard.ca that fit the BasicStamp 24 pin layout.
The ARMstamp/LPC11U37 duplicated those pins as well as added another 2 rows of pins.
Below is a picture of my "Set Condition Zebra" - [as I remember it] RED night lights for
my man-cave. {the Internet says it was 'Dog Zebra'}.
'
The relay board has isolated inputs. Currently only 1 relay is used. I power it from a
USB power pak, but needed the 3.3v for the A/D inputs. I loaded up the power section
in case I wanted to go a different route - scrounged parts - not pretty.
FWIW - the relays pull 90ma each - so I wired the relay power to the external 5v line;
didn't want to run all that current through the ARMstamp.
'
I had to do a 14 hour test on the A/D readings - my computer screen / screensaver would
interfere with my initial 'trigger' levels !!!! It currently uses a software timing loop and
turns off at 0730. The 'toggle' forces it on and overides the trigger level until turn off time.
'
I modified the "MultiTask.bas" file to do the different functions - RTC / monitor toggle /
sensor input/ main control functions of the relay-time-trigger level...You gotta watch out
for the amount of time you assign to each function - it can appear to hang... I ended up
using the "jump out of loop via the force interrupt method" for each task!!!
'
"Done is better than ....." - there are a few more additions I want to do - time will tell
Gary
edit Oct 13, 2019 changed picture to final version
ZEBRA.jpg
ZEBRA.jpg (148.37 KiB) Viewed 11834 times



olzeke51
Posts: 414
Joined: Sat May 17, 2014 4:22 pm
Location: South Carolina

Re: Darken Ship - via ARMstamp

Post by olzeke51 »

Okay folks,
First - I updated the above picture
Second::
I had a hard time trying to do a 'switch debounce' routine in the MultiTask method.
So I added (in parallel) a toggle switch, with a bonus beeper!!
'
will post program after a little clean up - my USART prints seem to be doubling up !!!!
Olzeke51

basicchip
Posts: 1090
Joined: Fri Oct 19, 2012 2:39 am
Location: Weeki Watchee, FL
Contact:

Re: Darken Ship - via ARMstamp

Post by basicchip »

Buttons and switches bounce, and you have to take that into account. The easiest way is to look for a change in the button then ignore all other changes for a certain debounce time. That can vary a lot depending on the switch. I set up a simple test case on an ARMstamp with a push button between 2 pins. One pin driven low, the other pulled high by the internal resistor.

pb1.png
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Then some scope pix show the push is pretty clean, but release is takes about 1/2 millisecond to settle

DS1Z_QuickPrint2.jpg
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DS1Z_QuickPrint4.jpg
DS1Z_QuickPrint4.jpg (84.28 KiB) Viewed 11832 times
And here is a program to read the debounced state of the button and display that on the LED

Code: Select all

#define LED_PIN	1

main:

IO(61)=0		' drive one side of the switch low

DEBOUNCED_PB = IN(45)		' set the default state
MAYBE_BOUNCING = 0

while 1
	nextIN = IN(45)
	if DEBOUNCED_PB <> nextIN then
		if MAYBE_BOUNCING = 0 then
			DEBOUNCED_PB = nextIN			' record the change
			MAYBE_BOUNCING = 1
			DEBOUNCE_WAIT = TIMER + 1000	' wait 1 millisecond
		else
			if TIMER > DEBOUNCE_WAIT then
				MAYBE_BOUNCING = 0
			end if
		end if
	end if
	IO(LED_PIN) = DEBOUNCED_PB
loop
	

olzeke51
Posts: 414
Joined: Sat May 17, 2014 4:22 pm
Location: South Carolina

Re: Darken Ship - via ARMstamp

Post by olzeke51 »

Confession time - learning point
I tested Basicchip's routine in my MultiTask program - it worked like a charm
'
So what was wrong with my ideas ??? -- TIME - I was doing 20- 50 ms time loops!
Turns out that information from the Internet is for RELAY contact bounce !!!!
'
Have a good day, y'all
Gary

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