Author Topic: Evil Genius: Mechatronics. 1st project resistor  (Read 2569 times)

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Offline lorenbTopic starter

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Evil Genius: Mechatronics. 1st project resistor
« on: March 18, 2009, 06:40:34 PM »
Hi, I recently bought the evil genius: mechatronics book and it say you need a 1M ohms x 1/8 watt resistor (brown, black, red) I was planning on ordering this and other materials from alliedelec.com, but then i saw that the color code for the 1 megaohm resistor isn't brown,black, red. I looked up how to read color code and found that it should be brown,black,green for 1 megaohm. So he either messed up the color code or put the wrong resistance down and it should be 1k ohms. anybody know which one it is or if I'm missing something.

Thanks,
Loren

Offline want2learn

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #1 on: March 19, 2009, 02:31:37 PM »
Really, to figure this out without having seen the book (as I've never heard of it) you would need to post a schematic. You haven't told us what type of circuit you are referring to.

Although since the schematic is from a book it may not be ok to post it freely on the internet.

On the other hand, if the resistor isn't protecting any components that are expensive you could buy the 1K resistor and the 1M resistor and try them both :o. It's not really sound advice but hey, If nothing expensive will be damaged then why not.
The question that drives me hazy:

Am I, or the others crazy?

Offline galannthegreat

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #2 on: March 19, 2009, 03:44:42 PM »
what project is it? I have done most of the projects in that book so maybe i can help you.
Kurt

Offline lorenbTopic starter

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #3 on: March 20, 2009, 12:01:59 PM »
its the 1st one with the race car

Offline galannthegreat

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #4 on: March 21, 2009, 09:22:23 PM »
Try out the 1M ohm resistor, it shouldn't hurt anything, because I can't seem to find the car I made.
Kurt

Offline SmAsH

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #5 on: March 21, 2009, 09:26:24 PM »
id say get both and try the 1m first as too little power wont really harm much will it now?
Howdy

Offline Razor Concepts

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #6 on: March 21, 2009, 09:35:25 PM »
Don't think in that mindset because if the resistor is part of a voltage divider circuit, the 1M could take so little power that a lot of power goes through the other way.

Offline SmAsH

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #7 on: March 21, 2009, 09:37:43 PM »
ok how about emailing/calling them and demanding to know the correct resistance!
Howdy

Offline galannthegreat

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #8 on: March 21, 2009, 09:44:54 PM »
Hmmm.... of all things even I have not thought about, maybe google it.
Kurt

Offline want2learn

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #9 on: March 22, 2009, 03:01:19 AM »
Don't think in that mindset because if the resistor is part of a voltage divider circuit, the 1M could take so little power that a lot of power goes through the other way.

Sorry, I did say though
It's not really sound advice

(Hangs head in shame)
The question that drives me hazy:

Am I, or the others crazy?

Offline TrickyNekro

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #10 on: March 22, 2009, 06:11:41 AM »
Really..... post a schematic if you want help....
You need reference, and you are not going to copy the schematic out of the book...
Fortunately or not, in books it's not allowed to post a scanned version of the page...
But remaking the schematic in the eagle is another thing... You can literally do it without a problem...
You can say it's your schematic, cause you have design it, and if you got reference from a book you
may want to post it or not....
Copyrighting an electronics schematic is really not relevant.... Thousand same schematics may exist....
So... Make it on eagle and post it... easy....

I could just guess that it's 1K.... Usually, first projects refer to lighting and LED.... so... I guess that it's 1K...
I also guess that's it's an 1K resistor cause when he describes the colors he describes a 1K resistor...
Also see how close it's that M on the keyboard to the K..... So... Post a schematic.... I can't really smell my fingers...
For whom the interrupts toll...


P.S. I've been inactive for almost a year... Don't give promises but I'll try to complete my tutorials. I'll let you know when..

Cheers!

Offline Soeren

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #11 on: March 22, 2009, 12:59:13 PM »
Hi,

its the 1st one with the race car
If you use 1 Mohm, it will take total darkness to shut off the motor (might not even be enough), so you should go with 1 kOhm.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline galannthegreat

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #12 on: March 22, 2009, 07:38:26 PM »
K, I've found the book and project that I did, just look at the wiring diagram (schematic if you call it that) they show what you need.
Kurt

Offline Soeren

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #13 on: March 23, 2009, 06:15:36 AM »
Nah, the schematic shows 1MOhm which is way too high.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline vialick

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #14 on: March 26, 2009, 06:52:13 AM »
Have you been to the books/publisher's site and searched for the errata?

books often have mistakes, especially technical books. I know the series (for the evil genius) and it's aimed at the layman rather than the scientist, if you're still unsure, fire the publisher an email.

You pay good money for one of these books, you shouldn't have to troubleshoot their designs (unless they explicitly want you to)

Offline Newton C. Braga

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Re: Evil Genius: Mechatronics. 1st project resistor
« Reply #15 on: March 31, 2009, 11:59:53 AM »
Hi, I recently bought the evil genius: mechatronics book and it say you need a 1M ohms x 1/8 watt resistor (brown, black, red) I was planning on ordering this and other materials from alliedelec.com, but then i saw that the color code for the 1 megaohm resistor isn't brown,black, red. I looked up how to read color code and found that it should be brown,black,green for 1 megaohm. So he either messed up the color code or put the wrong resistance down and it should be 1k ohms. anybody know which one it is or if I'm missing something.

Thanks,
Loren

Hi, I´m the author of the book Mechatronics for the Evil Genius; I´ve been using the 1 M (brown, black, green) resistor with my pupils since several years with success. The idea is start the motor when the sensor is iluminated and stop and when it is convered. But you can replace the resistor by a 1 Mohm potentiometer and adjust the light level to start the motor.

Thanks
Newton C. Braga

 


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