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Forum: The Projects Forum 01-29-2011, 07:31 PM
Replies: 15
Views: 1,923
Posted By arthur92710
By turning on both Q3 and Q4, the motor is...

By turning on both Q3 and Q4, the motor is 'shorted'. While spinning on its own it produces a voltage. The voltage then tries to spin the motor in the opposite the direction. It will slow down faster...
Forum: General Electronics Chat 01-28-2011, 03:28 PM
Replies: 37
Views: 3,649
Posted By arthur92710
Are you limited only to gasoline engines? Average...

Are you limited only to gasoline engines? Average efficiency is less then 20%. IIRC 50% has been reached but on huge engines on ships, not small 1cyl. Look into using a '6 stroke'....
Forum: General Electronics Chat 01-28-2011, 03:47 AM
Replies: 37
Views: 3,649
Posted By arthur92710
What about raising the tank above the engine and...

What about raising the tank above the engine and letting gravity do some work?
Forum: General Electronics Chat 01-28-2011, 02:15 AM
Replies: 37
Views: 3,649
Posted By arthur92710
What are you using this engine for? If you use an...

What are you using this engine for? If you use an alternator you wont have to worry about power use. If that's a problem get a mechanical fuel pump and use a pressure regulator to send any fuel back...
Forum: General Electronics Chat 01-27-2011, 05:11 AM
Replies: 9
Views: 1,757
Posted By arthur92710
You need a programmer. Something like this:...

You need a programmer. Something like this: http://www.sparkfun.com/categories/7 I use the AVR Dragon... Well used it. I broke it last week.

Actually, you can....
Forum: General Electronics Chat 01-27-2011, 04:54 AM
Replies: 9
Views: 1,757
Posted By arthur92710
Uhhh, what are you trying to do? If you are...

Uhhh, what are you trying to do? If you are trying to write your program to the chip with a serial cable and max232, afaik it wont work.

The pins for hardware serial are 7(SDA) and 9(SCL). Page...
Forum: General Electronics Chat 01-27-2011, 04:41 AM
Replies: 9
Views: 1,757
Posted By arthur92710
You could probably connect it to any pin, not...

You could probably connect it to any pin, not ground or voltage, and modify your program.
Im not sure if the ATtiny84 has built in serial hardware, but if it does and you choose to use it, it has...
Forum: General Electronics Chat 01-27-2011, 04:22 AM
Replies: 9
Views: 1,757
Posted By arthur92710
You will need a MAX232 chip. The ATtiny is 0-5v...

You will need a MAX232 chip. The ATtiny is 0-5v and the signal from the pc is -15-15v.
Forum: The Projects Forum 01-26-2011, 05:01 AM
Replies: 12
Views: 1,626
Posted By arthur92710
Smile You can probably do it without programming. Two...

You can probably do it without programming.
Two push buttons, the type that you press once to turn on and then again to turn off, an XOR and an inverter. Put one button on each side, when it hits...
Forum: General Electronics Chat 01-23-2011, 04:34 PM
Replies: 4
Views: 2,299
Posted By arthur92710
The PS is not finalized. I found a small 12v...

The PS is not finalized. I found a small 12v transformer that I can use. I will probably use a relay.
Forum: General Electronics Chat 01-23-2011, 03:25 PM
Replies: 4
Views: 2,299
Posted By arthur92710
Mainly the 200v 18A rating, and it is the only...

Mainly the 200v 18A rating, and it is the only component that I have that can handle so much power.

I will look into using a TRIAC, but a relay would need more the 5v. I have a limited amount of...
Forum: General Electronics Chat 01-23-2011, 06:42 AM
Replies: 4
Views: 2,299
Posted By arthur92710
Switching AC mains(2kw) with MOSFET

Hi, guys im building a digital thermostat to replace a mechanical thermostat in a portable heater. I have the digital part built, it output a +5v to turn on the heat and 0v to turn it off.

The...
Forum: The Projects Forum 01-23-2011, 06:14 AM
Replies: 13
Views: 3,657
Posted By arthur92710
This is a common method of house wiring. ...

This is a common method of house wiring.
http://www.make-my-own-house.com/images/cableplacementR.jpg
The wood framing can be called 2x4(2 by 4).

I think the wood you are talking about goes as...
Forum: Off-Topic 10-26-2010, 02:59 PM
Replies: 6
Views: 1,780
Posted By arthur92710
That solves it! I guess in going with poor...

That solves it!

I guess in going with poor conductor.

Thanks for your views.
Forum: Off-Topic 10-26-2010, 03:38 AM
Replies: 6
Views: 1,780
Posted By arthur92710
Resistors: Poor or semi conductors?

Resistors: Poor or semi conductors?

I'm stumped, what is the best word to describe what a resistor is made of? :confused:
In my understanding a 'Poor Conductor' (Not a rail-road joke from my...
Forum: Homework Help 10-21-2010, 03:28 PM
Replies: 9
Views: 1,733
Posted By arthur92710
Update: We just passed component testing. Its...

Update:
We just passed component testing. Its basically a test of the system up to sector/switch 4,5,6, using light sensors A-H.
Forum: Off-Topic 10-13-2010, 12:28 AM
Replies: 16
Views: 2,341
Posted By arthur92710
Your right, I should have stated that the first...

Your right, I should have stated that the first reply was sufficient.
Thanks for the answers and fun!
Forum: Off-Topic 10-12-2010, 10:08 PM
Replies: 16
Views: 2,341
Posted By arthur92710
If I was told that both examples are below 10...

If I was told that both examples are below 10 that would have been enough. I really did not need the writing example, although thanks for it as that was why this question came up.

I did not give...
Forum: Off-Topic 10-12-2010, 09:26 PM
Replies: 16
Views: 2,341
Posted By arthur92710
Thanks for the explanation John. Haha, this...

Thanks for the explanation John.

Haha, this question would only confuse engineers and programmers. I bet if I went to another forum, non technical, they would have given me the same response as...
Forum: Off-Topic 10-12-2010, 02:47 AM
Replies: 16
Views: 2,341
Posted By arthur92710
No trick, decimal. During a presentation at...

No trick, decimal.
During a presentation at school my professor told me that all numbers under 10 must be written out. Did he mean One, two, three, negative one and negative five billion one...
Forum: Off-Topic 10-11-2010, 06:20 PM
Replies: 16
Views: 2,341
Posted By arthur92710
Numbers below 10

What numbers are below 10?
Is -10 below 10?
Is -∞ below 10?
Forum: Homework Help 10-09-2010, 02:16 AM
Replies: 9
Views: 1,733
Posted By arthur92710
Great Idea! This is probably what I will do. ...

Great Idea! This is probably what I will do.

Before the train leaves it must know whether or not there is a possible path. But whether or not it should run as far as possible was not specified. I...
Forum: Homework Help 10-08-2010, 02:21 PM
Replies: 9
Views: 1,733
Posted By arthur92710
I guess the pic in my first post does not work? ...

I guess the pic in my first post does not work?
Ok, I have it as an attachment.
Sorry for the trouble.
Forum: Homework Help 10-08-2010, 03:30 AM
Replies: 9
Views: 1,733
Posted By arthur92710
Sorry, its just that im experimenting with...

Sorry, its just that im experimenting with different ways to solve this.

A train starts from the left, L1 or L2 or L3, it must move to the right side, it can stop at R1 or R2 or R3.
Their are...
Forum: Homework Help 10-08-2010, 02:54 AM
Replies: 9
Views: 1,733
Posted By arthur92710
Digital logic equations, lots of variables.

Hi, guys
Its been a while since I was here, but now I need some advice.
For my Semester long design project I am designing a digital logic system to guide a train. ...
Showing results 1 to 25 of 314

 
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