delay off ....... then on - Electronic Circuits Projects Diagrams Free

captnstoed · 1st January 2007, 02:35 AM

I just made up a test circuit using an LM555 ic. It lights an led for approx. 6-7 seconds then goes out. What I need it to do is delay those 6-7 seconds then pulse on long enough to trow a latching circuit using a dpdt signal relay (.2 sec or so). Im trying to figure this out and I know its simple enough, just cant think of how. Anyone have any ideas?

Thanks
here is the circuit I used.
http://www.doctronics.co.uk/images/555_11.gif

Russlk · 1st January 2007, 02:58 AM

You need two 555s, one for the delay, the 2nd for the 0.2sec pulse.

captnstoed · 1st January 2007, 03:43 AM

fo course ... thanks, I'll give that a try. Is there another ic I could use that could do both functions?

mvs sarma · 1st January 2007, 04:42 AM

Quote:

Originally Posted by captnstoed

fo course ... thanks, I'll give that a try. Is there another ic I could use that could do both functions?

Hi, Use 556. it is two 555s ina single pack

justDIY · 1st January 2007, 08:27 AM

Here's a great IC to solve your problem:

12F509 ... less than buck each, and requires no external components, aside from some glue depending on what you're switching.

gramo · 1st January 2007, 11:47 AM

Quote:

Originally Posted by captnstoed

I just made up a test circuit using an LM555 ic. It lights an led for approx. 6-7 seconds then goes out. What I need it to do is delay those 6-7 seconds then pulse on long enough to trow a latching circuit using a dpdt signal relay (.2 sec or so). Im trying to figure this out and I know its simple enough, just cant think of how. Anyone have any ideas?

You could grab the lite version of proton+ and make life damn easy with a couple of commands, im not sure if this is exactly what you want, but its easy to modify (you can use any 16F series pic really, most are cheap and great, but theres a few that out perform others)

PHP Code:

   
Device = 16F876A        ' Declare the device being used

Xtal = 4                 ' Crystal Speed

 
ALL_DIGITAL = True        ' Make all outputs digital

 
TRISA = %00000000        ' Make all of porta outputs

PORTA = %00000000        ' Set them all low

 
Symbol LEDS = PORTA.0    ' The compiler will now change LEDS to PORTA.0 

Symbol Relay = PORTA.1    ' and Relay to PORTA.1 whenever they are used now

 
Main:                         ' Start of program

     

     LEDS = 1            ' Turn on the LEDS

     Delayms 6000        ' Delay for 6 seconds

     LEDS = 0            ' Turn them off

     

     Relay = 1            ' Turn on the relay

     Delayms 200        ' Delay for 0.2 Second

     Relay = 0            ' Turn the relay off

     

     Goto Main             Do it forever

andy257 · 1st January 2007, 12:42 PM

Hi Gramo,

I am sorry to hijack this post but i was curious to know what language that code is for. I am studying microcontrollers atm and learning assembly. It looks like a higher level langauge just wondered which one.

Cheers

Andy

UPDATE: doh (homer simpson voice)...... just noticed its PHP

Quote:

Originally Posted by gramo

PHP Code:

   
Device = 16F876A        ' Declare the device being used

Xtal = 4                 ' Crystal Speed

 
ALL_DIGITAL = True        ' Make all outputs digital

 
TRISA = %00000000        ' Make all of porta outputs

PORTA = %00000000        ' Set them all low

 
Symbol LEDS = PORTA.0    ' The compiler will now change LEDS to PORTA.0 

Symbol Relay = PORTA.1    ' and Relay to PORTA.1 whenever they are used now

 
Main:                         ' Start of program

     

     LEDS = 1            ' Turn on the LEDS

     Delayms 6000        ' Delay for 6 seconds

     LEDS = 0            ' Turn them off

     

     Relay = 1            ' Turn on the relay

     Delayms 200        ' Delay for 0.2 Second

     Relay = 0            ' Turn the relay off

     

     Goto Main             Do it forever

gramo · 1st January 2007, 12:48 PM

no, its not PHP, i just use php 'quotes' as they dont take all the tabs/extra spaces out for the remarks that you throw in after commands, i.e.

Quote:

Test ' Remark

PHP Code:

   
Test           Remark

Its all written in Proton+, you can download the lite version, but it restricts you to 50 lines of code - still plenty to use for small apps.

gramo · 1st January 2007, 12:55 PM

Its really powerfull, and after a quick look through the help file you'll see just how much diversity the program has, and it doesnt stop at math, its the ease of use to interface with almost everything on the market today from LCD's to servos to almost any serial interface.

They have a user forum aswell that really has a great support network

andy257 · 1st January 2007, 01:23 PM

thanks for that Gramo. Trying to become experienced in assembly but once i have mastered assembly i will convert to a higher language for the more complex circuits.

**Nigel Goodwin** · 1st January 2007, 01:41 PM

Quote:

Originally Posted by gramo

no, its not PHP, i just use php 'quotes' as they dont take all the tabs/extra spaces out for the remarks that you throw in after commands

Why not just use the 'Code' tag? - it's even on a button '#' on the Advanced entry setting.

gramo · 1st January 2007, 02:05 PM

Quote:

Originally Posted by Nigel Goodwin

Why not just use the 'Code' tag? - it's even on a button '#' on the Advanced entry setting.

Nice, Never noticed, I'll keep that in mind!

captnstoed · 1st January 2007, 02:35 PM

Ok, Ive got the desired outcome using two 555's because thats what I have on hand.
On this PIC topic, how difficult is it for someone new to this, to get up and running? For instance, here are a few porjects I need to develop

1. @ the push of a button, set delay of 5 seconds, then random delay of 0-5 seconds that pulses a relay.

2. an IR Transmitter (just a beam) that works over 10 feet. Im looking at 38khz mod and pulses of 1400hz to be "seen" by the IR module.

3. A stopwatch with a large LED display to be used as a timer from point A to B.

Would it be worth while to learn PIC'S for all this? I am new to electronic components but learning quickly.
Is there anyone out there who devolops prototyes like this?
Thanks for all the help.

House0Fwax · 1st January 2007, 02:56 PM

Pics are fantastic, they can do all you need and much more besides.
Have a look at Nigel's tutorials.

gramo · 1st January 2007, 03:00 PM

Given the outcomes you want, I'd say PICs would deffinetly be worth looking into, but you still have to consider;

* Buying/Building a programmer (Fairly cheap)
* Getting a Development suit like Proton+/other higher level ones or Learn to bit crunch with Assembler
* And finially you will have to buy PIC's and other peripherals like crystals

Heres a basic list from futurlec.com.au (prices are in australian, goto futurlec.com for $US)

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1st January 2007, 02:35 AM	(permalink)
captnstoed	delay off ....... then on I just made up a test circuit using an LM555 ic. It lights an led for approx. 6-7 seconds then goes out. What I need it to do is delay those 6-7 seconds then pulse on long enough to trow a latching circuit using a dpdt signal relay (.2 sec or so). Im trying to figure this out and I know its simple enough, just cant think of how. Anyone have any ideas? Thanks here is the circuit I used. http://www.doctronics.co.uk/images/555_11.gif

1st January 2007, 02:58 AM	(permalink)
Russlk	You need two 555s, one for the delay, the 2nd for the 0.2sec pulse. __________________ see my website: www.geocities.com/russlk

1st January 2007, 03:43 AM	(permalink)
captnstoed	fo course ... thanks, I'll give that a try. Is there another ic I could use that could do both functions?

1st January 2007, 08:27 AM	(permalink)
justDIY	Here's a great IC to solve your problem: 12F509 ... less than buck each, and requires no external components, aside from some glue depending on what you're switching. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

1st January 2007, 12:55 PM	(permalink)
gramo	Its really powerfull, and after a quick look through the help file you'll see just how much diversity the program has, and it doesnt stop at math, its the ease of use to interface with almost everything on the market today from LCD's to servos to almost any serial interface. They have a user forum aswell that really has a great support network __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net

1st January 2007, 01:23 PM	(permalink)
andy257	thanks for that Gramo. Trying to become experienced in assembly but once i have mastered assembly i will convert to a higher language for the more complex circuits.

1st January 2007, 02:35 PM	(permalink)
captnstoed	Ok, Ive got the desired outcome using two 555's because thats what I have on hand. On this PIC topic, how difficult is it for someone new to this, to get up and running? For instance, here are a few porjects I need to develop 1. @ the push of a button, set delay of 5 seconds, then random delay of 0-5 seconds that pulses a relay. 2. an IR Transmitter (just a beam) that works over 10 feet. Im looking at 38khz mod and pulses of 1400hz to be "seen" by the IR module. 3. A stopwatch with a large LED display to be used as a timer from point A to B. Would it be worth while to learn PIC'S for all this? I am new to electronic components but learning quickly. Is there anyone out there who devolops prototyes like this? Thanks for all the help.

1st January 2007, 02:56 PM	(permalink)
House0Fwax	Pics are fantastic, they can do all you need and much more besides. Have a look at Nigel's tutorials.

1st January 2007, 03:00 PM	(permalink)
gramo	Given the outcomes you want, I'd say PICs would deffinetly be worth looking into, but you still have to consider; * Buying/Building a programmer (Fairly cheap) * Getting a Development suit like Proton+/other higher level ones or Learn to bit crunch with Assembler * And finially you will have to buy PIC's and other peripherals like crystals Heres a basic list from futurlec.com.au (prices are in australian, goto futurlec.com for $US) __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net