Engineering - March 2007

2007-03-21 20:24:30 · 5 answers · asked by e r 1

2007-03-21 19:45:57 · 2 answers · asked by azima a 1

I have started reading a robotics/micro-controller book, but have not reached the motor or digital to analog sections yet. From what I have read, I know the pins can output 0 to 5 volts, steady or at different pulse rates. Then theres digital to analog circuits, step motors, DC motors, AC motors, and infrared sensors that can read a pattern on the wheel and therefore calculate an angular velocity that can be used as feedback.

From all these tools, what is the typical method for controlling a motor's speed? What is the best motor to use? Should I drive it with pulses (PWM I think) or an anolog signal? Are there pins on some micro-controllers that can directly accept the analog signal from the infrared sensor?

I'm looking for a general explanation from somebody who has experience in building amatuer robots.

For your information, I'm looking to eventually buy A-Wits Technologies C-Stamp.

2007-03-21 19:40:19 · 4 answers · asked by Anonymous

dc micromotor controller is a speed controller device

2007-03-21 19:35:13 · 2 answers · asked by lavi v 1

digital electronics

2007-03-21 19:27:35 · 2 answers · asked by rux 1

2007-03-21 19:19:03 · 1 answers · asked by Anonymous

2007-03-21 19:13:00 · 1 answers · asked by Ashwin 1

I need to control the speed of 1.5 V DC motor.. But don't know how to control it. Can i do it with some resistors, capacitors, and transformers??

2007-03-21 18:51:44 · 12 answers · asked by Anonymous

2007-03-21 18:44:30 · 3 answers · asked by Vanessa 1

i have a 6V battery with 1.2Amphour. I have a switch which switches it from parallel to series or vise versa. I have 2 bulbs in place for parallel and 2 bulbs in place for series. Supposedly just the bulbs ohm is 4. so we know for the series circuit each bulb is producing 5.50 V when i switch it. For the series when i switch to series i am getting like 2.9V from each bulb. What i then did was divide the V/I to get my amp. And when i do this my amp from parallel is twice that of the series, is there a connection mistake or what is the reason i am getting these results. My science fair is tomorow any help please I NEED AN ANSWER KNOW PLEaSe. thnak you

2007-03-21 18:39:43 · 7 answers · asked by Phone Lines Inc 1

Making a coffee roaster. I could use a thermostat to keep the temp around 500 degrees F.

2007-03-21 18:26:54 · 2 answers · asked by Anonymous

2007-03-21 17:32:24 · 6 answers · asked by flu269269 2

In Project Management ...
What are the advantages and disadvantages of using performance based requirement (eg strength, sound properties, heat transmission characteristics, etc) to specify scope versus being prescriptive (eg 200 mm masonry wall)?

2007-03-21 17:24:46 · 2 answers · asked by Maha A 1

i know that braking is used to charge the battery in a hybrid car, but why can't the wheels spinning be used in a similar fashion? electricity is generated by turing turbines of various kinds, windmills, waterfalls, even in a coal buring electrical plant electricity is generated by spinning turbines. whould not a car using the same principle be able to run just about endlessly?

2007-03-21 17:18:50 · 8 answers · asked by Shuson 1

2007-03-21 17:04:04 · 3 answers · asked by JAMES 4

the total power consumed by two resistors , connected in a parallel is 25 watts .if the voltage applied is 5 volts dc and the current in one resistor is 1.5 ampere ,what are the resistances of the two resistors?

2007-03-21 17:01:08 · 5 answers · asked by harry s 1

2007-03-21 16:36:20 · 10 answers · asked by nala 1

2007-03-21 16:23:46 · 6 answers · asked by David Junior 3

2007-03-21 15:28:20 · 4 answers · asked by melee9000 1

2007-03-21 14:55:19 · 3 answers · asked by David Junior 3

2007-03-21 14:43:32 · 2 answers · asked by Anonymous

I'll be attending Ohio State next year and they have electrical engineering and computer engineering, but they don't have electronics engineering. From my research on electronics engineering it's a mix of computer and electrical, but what would be a good major and minor so as to land a job as an electronics engineer after graduating?

2007-03-21 14:33:29 · 4 answers · asked by tmk8807 1

2007-03-21 14:19:17 · 1 answers · asked by john b 1

2007-03-21 14:02:29 · 2 answers · asked by lilamngolfergirl95 1

2007-03-21 14:00:57 · 6 answers · asked by NaNa0117 1

How many 1μF capacitors would be need to be connected in parallel in order to store a charge of 1 coulomb with a potential of 200volts across the capacitors?

I'm looking at my equation sheet and I think using Q = CV formula would help me solve it... the question is how to find how many capacitors do I need to fill up a full parallel circuit?

2007-03-21 13:54:58 · 1 answers · asked by Sir Guitarist 2

Don't you think technology is amazing? I think it's amazing how people came up with the telephone, quickpad, etc. It's just so cool!!

2007-03-21 13:38:52 · 6 answers · asked by Anonymous

2007-03-21 13:28:51 · 2 answers · asked by john b 1

This is the question:

An RC Circuit has a resistance of 20MΩ and a time constant of 100 sec. If the capacitor is charged to a voltage of 10v, what is the charge in coulombs on its plates?

Right away when I think of charge I think of Q = CV (since its asking for coulombs). I am thinking of using the question Q=CV(1-e^-t/RC). The thing is that what is the capacitance if I'm using this... and what is t if I have the time constant already?

Help me!

2007-03-21 13:21:48 · 3 answers · asked by Sir Guitarist 2

I have never understood why Amps are refered to as "I" - can someone explain?

2007-03-21 12:48:07 · 4 answers · asked by Anonymous