Electronic circuit whitc me555

[javilette]

hi i need do it a Electronic circuit for the led of the airbag for itv inspection. i have 555 chip but i need someone that calcule the value of the condensers and the resistances and the scheme for this. i need when i turn on the key the time of the airbag light is light for a 10 secons + -.if i need put 12v in 5v i have L7805cv for this bu i think that the 555 can work 5-16v,can someone help me whitc this.

[alfabit]

hi i need do it a Electronic circuit for the led of the airbag for itv inspection. i have 555 chip but i need someone that calcule the value of the condensers and the resistances and the scheme for this. i need when i turn on the key the time of the airbag light is light for a 10 secons + -.if i need put 12v in 5v i have L7805cv for this bu i think that the 555 can work 5-16v,can someone help me whitc this.

Look at the datasheet of LM555 on alldatasheet.com, you`ll find there your schematic, the formula for the C and R ( one C and one R ), look for a monostable schematic.
It`s very simple schematic for someone which knows electronics. If you don`t, find a guy who will do that for you.

[Meat-Head]

555 Timer - Frequency and Duty Cycle Calculator - Online Calculators - Conversions - Converters (http://www.hobbyprojects.com/calculators/555_timer_frequency_duty_cycle.html)

[javilette]

my english is not good, somebody have the scheme for this i think that i need resistor of 500 ohms and condenser of 1 microfaradium (1000 nanofaradium). i think that i can use the 12v but if cant works ok i put a L7805cv for use 5v.

[nicamarcos]

hi i need do it a Electronic circuit for the led of the airbag for itv inspection. i have 555 chip but i need someone that calcule the value of the condensers and the resistances and the scheme for this. i need when i turn on the key the time of the airbag light is light for a 10 secons + -.if i need put 12v in 5v i have L7805cv for this bu i think that the 555 can work 5-16v,can someone help me whitc this.

From where are you? , maybe i can help you with more elegant solution and not prehistoric 555 :)

[javilette]

i put the ligh of the airbag whict the oil but in itv say to customer that the light of the airbag have to turn off no whitc oil light. you understand me.i from spain

[Meat-Head]

my english is not good, i think that i can use the 12v but if cant works ok i put a L7805cv for use 5v.


yes 12 volt is good OR use "7810" regulator
lower voltage will increase timing - i think.




:rulez: Velleman MK111 - help!!! (http://www.electro-tech-online.com/general-electronics-chat/23208-velleman-mk111-help.html) :rulez:

[javilette]

nicamartos i hope yor solutions

[nicamarcos]

nicamartos i hope yor solutions

how much seconds need light on and after off?

[javilette]

10 secons + -

[nicamarcos]

Here you have schematic with simple pic16f84. 10 Seconds exact.:)

[nicamarcos]

And .HEX firmaware, program it direct to pic16f84, not need set any fuse. PASS in you P.M

[nicamarcos]

Schematic in this folder, same pass.

[Meat-Head]

PASS in you P.M


same pass.


WHOA, HANG ON, WHY PUT A PASSWORD ON FILE????

DK IS A SHARING SITE, WHY DO OTHER MEMBERS BOTHER TO HELP OUT, EVENING'S WEEKENDS, BANK HOLIDAYS ETC ETC, THEN FOLKS PASSWORD STUFF.

YES STOPS LEECHERS, BUT GOES THE OTHER WAY, AT M-H-M WE NEED A IMMO OFF FILE - YES THERE IS ONE ON HERE, PASSWORDED!! MEMBER NOT BEEN ON FOR MONTHS! :rulez::rulez::rulez::rulez::rulez:

[nicamarcos]

WHOA, HANG ON, WHY PUT A PASSWORD ON FILE????

DK IS A SHARING SITE, WHY DO OTHER MEMBERS BOTHER TO HELP OUT, EVENING'S WEEKENDS, BANK HOLIDAYS ETC ETC, THEN FOLKS PASSWORD STUFF.

YES STOPS LEECHERS, BUT GOES THE OTHER WAY, AT M-H-M WE NEED A IMMO OFF FILE - YES THERE IS ONE ON HERE, PASSWORDED!! MEMBER NOT BEEN ON FOR MONTHS! :rulez::rulez::rulez::rulez::rulez:


If you need pass, only you have that ask me, but i think not useful for you because is special application, or you will do from now every airbags light with "dog"?, i know rules, but it is my own work, not simple edition in hex editor, a little more work todo firmaware than do only edition. Where do you find sch+hex freedom :)

[Meat-Head]

Hi, i need pass, please.
regards


Hi, i need pass, please.
regards

nicamarcos (http://www.digital-kaos.co.uk/forums/members/81124-nicamarcos/)

SEE, LOOK NOW WE HAVE YET ANOTHER THREAD WITH PEOPLE ASKING FOR PASSWORDS, THANKS
MATE
(http://www.digital-kaos.co.uk/forums/members/81124-nicamarcos/)

[rp1210a]

Ebay or Google

"DEI 528T"

A very nice problem solver. Will take 12V or ground trigger, latched or pulse. Output time is adjustable 1-90 seconds. Always keep one on hand.

[nicamarcos]

Since now i see a lot guys putting "dogs" to airbag lights????, seem as like that airbag repair and others system is deading? :)
Please, you have this S.*.I.T of project here.
Happy now? :)

[nicamarcos]

Here free without pass

[nicamarcos]

.....Upps.....

[javilette]

i had do it this scheme but dont work i program the pic ok,i use a 7805 for 5 v i put 12 v in circuit but the light dont work any time.

[nicamarcos]

Check well, project 1000% tested on simulation software :)

[nicamarcos]

One question, where did you conected pin 5 and 14 of PIC?
Because theirs were omitted in schematic.

[javilette]

pin 5 and 14 i dont conected.i conected pins 4,6 15 and 16 but dont works i ckeck it again , i dont think it is bad.

[nicamarcos]

pin 5 and 14 i dont conected.i conected pins 4,6 15 and 16 but dont works i ckeck it again , i dont think it is bad.
Your forgot supply to microcontroller :), put 5 to gnd and 14 to +5v (vcc). Now yes will work :)