Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: osnap on March 04, 2007, 01:34:42 PM
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hi all,
I've been reading that you can make some cool simple circuits using 555 timers. I looked and I saw that radioshack had one, so I think I'm going to buy some -- but I'm confused I know it doesn't need to be programmed, so, what would be needed to make a simple flashing LED circuit or something?
thanks, any help is greatly appreciated ;D
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Here are some cool projects one is an astable oscillator (if you attach an LED to the output it will flash) and then if you get a 556 duel trimer or 2 555 timers you can make a light seeking robot with the uther schematic
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Woa... uh.. could you just explain the schematic a bit?
I already don't understand 555 timers much as it is lol
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well those schematics helped me figure out my 555 timer, but they arent very.... pin friendly
http://www.uoguelph.ca/~antoon/gadgets/555/555.html, has the pin positions so if you base off both of the drawings then you can get a working LED flasher with adjustable speed
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how is the speed adjusted?
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OK it is really quite simple their are two different basic types of circuits for the 555 one is astable that is gust a continues pulse. Here is an example.then there is monostable witch is triggered and last for a specific amount of time. for more info got to www.kpsec.freeuk.com/555timer.htm this is were I learned every thing I now about the 555 and 556 timers.
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how is the speed adjusted?
it is adjusted with the 50k pot
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hmm okay, I guess I just need to read more then before I try and work one of these
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If you really want to understand them the BEST book is by Forest Mims the 3rd called Timer, Op Amp & Optoelectronic Circuits & Projects, it has detailed schematics and explanations for everthing you would want to know.
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This is possibly the ultimate book for you:
http://www.amazon.co.uk/Integrated-Circuit-555-Projects-BP/dp/0859340473/ref=sr_1_1/203-6935087-2798348?ie=UTF8&s=books&qid=1173116172&sr=1-1
It reads like an old uncle who smells of old spice.
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I can post a blinking LED circuit if you need it.
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Thanks for those two books :)
And ya, robot321, I'd like that very much
I found this circuit that I want to try:
http://www.doctronics.co.uk/images/555_10.gif
but I'm confused about what connects where -- I couldn't find a shot from the bottom, lol
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but I'm confused about what connects where -- I couldn't find a shot from the bottom, lol
It's a breadboard pic--no need for a shot from the bottom. :)
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oh... so it is :-X
rofl thanks
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Hey, if wanted to make this, does this mean that the two output wires are my + and -, that I would connect to a LED if I wanted to have it flash every 120 seconds?
also, on the left, is that the + and - from like 9v battery?
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Log-in to view attached 555-timer circuit
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You could put a pot where resitor one is to regulate how fast is flashes right?
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Thanks, Robot321. (Instead of that 1 6v, 4 AAs would work, right? lol
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osnap: yes 1.5vx4 =6v
ed1380: yes a pot would do nicely ;)
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what is a pot? lol
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pot short for potentiometer are adjustable resistors.
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cool -- i think i'll try making what you posted.
(is a breadboard worth investing into?)
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cool -- i think i'll try making what you posted.
(is a breadboard worth investing into?)
A bread board is the most important prototyping tool you will ever use.
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Here's a useful link
it can solve for resistance(R1 and R2), capacitance, frequency, time-on, and time off.
http://noisybox.net/electronics/555.php
(you need to enter 3 of 4 values)
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Thanks
last thing -- i bought a breadboard - am i supposed to remove the paper on the back so the little metal peices show?
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Leave it on.