not sifu la... i m just a noob in this.
Ermmm for saving cost..maybe u try it with those tamiya car engine first ? should be able to run normal size toy car ^^

ermmm......how bout installing a sensor at your door? lit the room when the person opens the door ? then u link the cords of light and fan together
Both will be on when a person OPENs the door . This would be the cheapest way to do it ...but its more to semi-auto anyway

to get it fully automated....u need to get those motion sensors....which is not efficient and costly

just my 2 cents

Looking for Antec APL55538A.. It's a dual channel regulator and reset IC in my DVD drive that got burnt when it was plugged into a crappy external adaptor (came with USB to IDE cable). Should I contact Antec directly for a sample, or got distributors for Antec ICs in Malaysia?

hi guys.. i need ur help. Im looking for the sensor that being used on cars. yes the reverse sensor. Wad izzit actually called? wanna get it to use on my FYP.

Im planning to do a robotic waiter. The function of the sensor is to prevent the robot frm getting stuck on the wall when its moving. Now im juz planning all the things i needed to get it started. Gonna go shop for a remote controlled car too
Now i need helps on circuit design stuff. Yea im kinda useless in this stuff.. and i call myself an EE student

Well all help are really appreciated. Kindly PM me if u know any good websites or information that can really help me ya

This post has been edited by Cloudx: Jul 19 2006, 01:11 PM

how sensitive should ur robo be? if just it is jsut within a short range (we are talking about CM here )...normal infra red sensors will do ^^



p/s: Sorry ya ......There was a dude asking about PLC ? I deleted your PM by mistake......really really sorry ...can u resend your mes to me ?

This post has been edited by chowsc: Jul 19 2006, 03:07 PM

Im planning to installed those sensors surrounding the robo with the range around >1m.
The infra red sensors need both receiver and transmitter rite?

yeapz exctly

Hmm...does that means if i want to use the infra-red sensor i'll hv to put the receiver everywhere so the robo wont go 'langgar dinding'

I dont know how to say.. so i've do some simple paint job.. go hv a look.


Attached thumbnail(s)

Cloudx, u have 2 choices, whether using infrared sensor or ultrasonic sensor.

u need both the transmitter and receiver. put it besides each other. correct me if wrong

but infrared is quite prone to noise such as sun light.

This post has been edited by harrychoo: Jul 20 2006, 12:08 PM

yes u r correct, infrared is quite prone to noise. thus put all black color around the infrared sensor can reduce the noise coz black absorb UV.

SPICE is program that simulates electronic circuits on your PC. You can view any voltage or current waveform in your circuit. SPICE calculates these voltages and currents versus time (Transient Analysis) or versus frequency (AC Analysis). Most SPICE programs also perform other analysis like DC, Sensitivity, Noise and Distortion.

http://www.ecircuitcenter.com/AboutSPICE.htm

Get the free SPICE software from here:
http://www.linear.com/designtools/softwareRegistration.jsp

spice added to the first page ^^ thanks for the recommendation

Discover Circuits, with its 23,000+ electronic circuits or electronic schematics cross-referenced into 500+ categories, is a vital resource for engineers, hobbyists, inventors & consultants. The site's collection of links will help you find quick solutions for electronic design problems.

Get them at http://www.discovercircuits.com/list.htm

Thanks for sharing. But i still cannot find the circuit i want...

SIfus, i need some help...
Bought some tiny LEDs to mod my Gundam kit, lights dun seem to turn on.
Wire and LED with 1.5watt battery(round flat coin like wan)...no other modification besides the soldering of the joints.

Can someone tell me wats wrong ?
Did i connect the wires to the wrong side of the battery ?
Or the LED is popped

Anybody knows a good website that sells electronic hobby kits?

Im looking for kits for ultrasonic sensors.

anyone know where can get stepper motor/DC motor/servo with resonable price? i'm doing a stair climbong robot for my fyp.
Jalan Pasar there got sell motors? Went before there but seems too messy til duno where to find what i want...thanks

Jalan pasar got sell stepper but hardly get a good 1..datasheet somemore are hard to find...sigh...wow..stair climbing??suppose need a larger torque stepper but it cost very high...few hundreds normally...search for farnell or RS..there got..

o...thanks ya...actually i'm searching for a cheaper motor...nvm..i'll go pasar there try look it out next week...

RS makes good steppers, with high res. If i'm not mistaken, they also manufacture some good stepper control modules which can be driven by 5V (PIC), saving you the trouble of building an interface circuit.