sensor based traffic light system - Electronic Circuits Projects Diagrams Free

jikes64 · 21st July 2007, 07:57 PM

Please need help on the circuit for a sensor based traffic light controller for a crossroad!
Im using Atmel ATMega 32 with the ATSTK500 development board.
Im really having problems coming up with the circuit to serve this purpose as it will have sensors and pedestrian walk utilizing the pushbuttons on the development board!
Its really driving me nuts as Im running out of time.
Will really appreciate it if anyone can help me out.
Thanks!

blueroomelectronics · 22nd July 2007, 03:22 AM

Running out of time? Does your town need them that badly?

kjennejohn · 22nd July 2007, 05:57 AM

We need more info. Can you provide a circuit description or (better yet) a schematic? How far have you gotten? Is the light sequencing throwing you, or the timing, or what? Please be explicit.

'Luck!
kenjj

seveprim · 22nd July 2007, 03:56 PM

will design it for cash ... lol well someone has to make a living !!!

jikes64 · 22nd July 2007, 06:30 PM

How much? Dont mind paying if you're sure u can design something good that works n wil serve the purpose!

blueroomelectronics · 22nd July 2007, 06:48 PM

I smell a school project...

jikes64 · 22nd July 2007, 07:20 PM

Quote:

Originally Posted by kjennejohn

We need more info. Can you provide a circuit description or (better yet) a schematic? How far have you gotten? Is the light sequencing throwing you, or the timing, or what? Please be explicit.

'Luck!
kenjj

THanks for the prompt reply! Its for my final year school project and is due in about 2 months! Im virtually just beginning so I cant say I have much on ground yet! I took permission from Prof. Bruce Land of Cornell University's School of Engineering in NY to redo a past project only Ive gotta include it a one of my references.

The site for the project is http://www.instruct1.cit.cornell.edu...76/report.html

I will be highly appreciative if you can look it up for me.
The site has basically all I need only its not as comprehensive as I would have desired. The schematics are there but aren't what Im looking for plus Im not sure if im right but some resistors need to be placed inseries with each LED which is not the case. Im really getting confused here as without the complete and correct circuit diagram, I cannot start construction! I already have the development board, microcontroller and sensors now but may use C++ instead of C as thats what im learnin now.
Please I really need you to enlighten me on how to go about it and also what It will take for you to put me through.
Thanks a mil.
Jikes

jikes64 · 22nd July 2007, 07:22 PM

yeah it a school project! wanna help?

blueroomelectronics · 22nd July 2007, 07:30 PM

Sure read this traffic light thread.
http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/28184-traffic-control-circuit.html?highlight=traffic+light

blueroomelectronics · 22nd July 2007, 07:33 PM

Or this thread
http://www.perlmonks.org/?node_id=193859

blueroomelectronics · 22nd July 2007, 07:49 PM

Or even this one...
http://www.sharkyforums.com/showthread.php?t=117815

kjennejohn · 22nd July 2007, 10:07 PM

Quote:

Originally Posted by jikes64

THanks for the prompt reply! Its for my final year school project and is due in about 2 months! Im virtually just beginning so I cant say I have much on ground yet! I took permission from Prof. Bruce Land of Cornell University's School of Engineering in NY to redo a past project only Ive gotta include it a one of my references.

The site for the project is http://www.instruct1.cit.cornell.edu...76/report.html

I will be highly appreciative if you can look it up for me.
The site has basically all I need only its not as comprehensive as I would have desired. The schematics are there but aren't what Im looking for plus Im not sure if im right but some resistors need to be placed inseries with each LED which is not the case. Im really getting confused here as without the complete and correct circuit diagram, I cannot start construction! I already have the development board, microcontroller and sensors now but may use C++ instead of C as thats what im learnin now.
Please I really need you to enlighten me on how to go about it and also what It will take for you to put me through.
Thanks a mil.
Jikes

Jeez, dude, you're link is not working! Not from here, anyway. We're batting zero. If this is your level of competence, MacDonald's is your only likely employer. Enter the link again and check it before posting.

Try again. Harder.
kenjj

seveprim · 23rd July 2007, 06:59 AM

Quote:

Originally Posted by kjennejohn

Jeez, dude, you're link is not working! Not from here, anyway. We're batting zero. If this is your level of competence, MacDonald's is your only likely employer. Enter the link again and check it before posting.

Try again. Harder.
kenjj

Nah mate I heard Mac Dolanlds was uping the bar .. lmao ... better try burger king !

blueroomelectronics · 23rd July 2007, 12:37 PM

Quote:

Originally Posted by jikes64

How much? Dont mind paying if you're sure u can design something good that works n wil serve the purpose!

He's got management written all over him.

Seriously all you had to do is make an effort, all you really stated was you have an Atmel chip a programmer and some sort of development board. Doing a crosswalk is a basic state machine and a simple venture outside to an actual crosswalk should provide you with plenty of ideas.

If it makes you feel better you're way ahead of another fellow here who's trying to build a crane. And he's in final year University!

seveprim · 23rd July 2007, 03:11 PM

Well with any project that interfaces with humans you first order of business is to make it fail safe... that is design it so when it encounters the world's dumbest pedistran it will recover in a safe maner ...(Design elevators and you will understand)

The key to this project is therefore safety... You can not just rely on people's good judgement to stay out of harms way in fact you have to begin to think in the other realm that they want to harm themselves (dont beleive me we all have crossed a red signal !!!)

So first step is to make the electronics fail safe ie no "two" green lights on causing a crash, also fautly lights need to addressed, back up power (when car takes out one pole the other should still operate (if mandated by local laws) also the displaced pole the power should be removed (if not already done so by car)

So the basics :-
1.Backup power
2.Radio/modem to traffic control
3.Red light camera detection (inputs to facilatate it)
4.Redundant saftey ciruits
5.Faulty operation mode(ie flashing amber/orange lights are used in Australia to indicate to the public the system is in fault and by law you then can procedd through the intersection by obeying normal traffic rules)
6.Idiot proof things like sensors for cars(ie car breaks down over sensor) also the push buttons if some how they stick it should be detected and reported back
7.Have plenty of time to research ppl behaviours .... Good luck you going to need it ...

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21st July 2007, 07:57 PM	(permalink)
jikes64	sensor based traffic light system Please need help on the circuit for a sensor based traffic light controller for a crossroad! Im using Atmel ATMega 32 with the ATSTK500 development board. Im really having problems coming up with the circuit to serve this purpose as it will have sensors and pedestrian walk utilizing the pushbuttons on the development board! Its really driving me nuts as Im running out of time. Will really appreciate it if anyone can help me out. Thanks!

22nd July 2007, 03:22 AM	(permalink)
blueroomelectronics	Running out of time? Does your town need them that badly? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd July 2007, 05:57 AM	(permalink)
kjennejohn	We need more info. Can you provide a circuit description or (better yet) a schematic? How far have you gotten? Is the light sequencing throwing you, or the timing, or what? Please be explicit. 'Luck! kenjj __________________ All my pencils used to have erasers!

22nd July 2007, 03:56 PM	(permalink)
seveprim	will design it for cash ... lol well someone has to make a living !!!

22nd July 2007, 06:30 PM	(permalink)
jikes64	How much? Dont mind paying if you're sure u can design something good that works n wil serve the purpose!

22nd July 2007, 06:48 PM	(permalink)
blueroomelectronics	I smell a school project... __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd July 2007, 07:22 PM	(permalink)
jikes64	yeah it a school project! wanna help?

22nd July 2007, 07:30 PM	(permalink)
blueroomelectronics	Sure read this traffic light thread. http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/28184-traffic-control-circuit.html?highlight=traffic+light __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd July 2007, 07:33 PM	(permalink)
blueroomelectronics	Or this thread http://www.perlmonks.org/?node_id=193859 __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

22nd July 2007, 07:49 PM	(permalink)
blueroomelectronics	Or even this one... http://www.sharkyforums.com/showthread.php?t=117815 __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

23rd July 2007, 03:11 PM	(permalink)
seveprim	Well with any project that interfaces with humans you first order of business is to make it fail safe... that is design it so when it encounters the world's dumbest pedistran it will recover in a safe maner ...(Design elevators and you will understand) The key to this project is therefore safety... You can not just rely on people's good judgement to stay out of harms way in fact you have to begin to think in the other realm that they want to harm themselves (dont beleive me we all have crossed a red signal !!!) So first step is to make the electronics fail safe ie no "two" green lights on causing a crash, also fautly lights need to addressed, back up power (when car takes out one pole the other should still operate (if mandated by local laws) also the displaced pole the power should be removed (if not already done so by car) So the basics :- 1.Backup power 2.Radio/modem to traffic control 3.Red light camera detection (inputs to facilatate it) 4.Redundant saftey ciruits 5.Faulty operation mode(ie flashing amber/orange lights are used in Australia to indicate to the public the system is in fault and by law you then can procedd through the intersection by obeying normal traffic rules) 6.Idiot proof things like sensors for cars(ie car breaks down over sensor) also the push buttons if some how they stick it should be detected and reported back 7.Have plenty of time to research ppl behaviours .... Good luck you going to need it ...