And one more----www.escol.com.my
selling ELECTRONIC KITS, COMPONENTS & PARTS

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Added on June 13, 2008, 10:22 pm can I know any online shop which sell electronic parts, components in affordable prices in Malaysia?
Actually I want to buy a 145mA, 2V dc motor..... i don't have transport to go to Jalan Pasar.

This post has been edited by intanying91: Jun 13 2008, 10:22 PM

where r u from?

cytron.com.my

i think its best u can get to jln pasar... u won know wat suits u if u dun see it for urself... wat r u planning to build anyway?

oh by the way, anyone here has experience in radio frequency transmission? i would need some help for my project...

This post has been edited by tomatotomatomy: Jul 14 2008, 10:58 PM

well anybody can recommend which PIC development and debugger kit is nice to use?

u mean the microp programmer?

ya a programmer that can debug and test also. but nvm d i get it from my lecturer

jacklsw86, you from mmu melaka ?

yep im from mmu melaka. just got microchip's ICD2 from my lecturer. somehow still need to set up my own lcd display cause that demo board don't have lcd.

u taking mini project ?

lcd display quite straight forward. interfacing that ciruit is the tricky part

u guys from mmu? do u guys happen to know ngu eng eng, yung man...

not mini project le. for my fyp. got rfid reader sumore. hmm do you know any electronics shop in penang? i'm going back there for break.

HI im looking for usb ISP programmer for Atmel That support AT89S8285 , AT89S8285 OR most of 89S family thanks

all AT89S family mcus isp can be activated via atmel isp software and the cable. i diy-ed the cable but for now still under testing cos not reliable. I canot find the model of mcu that you mentioned.

anyone know where i can get cheap microchip products in malaysia?

pic
eeprom
programmer...

if you got at least some qty like 50pcs, I can get the PIC ICs.. for you...

no
i juz nit some for my fyp

a part of my project is to control electrical appliances using pc.

parallel port<mcu<electrical appliances ie: lamps,fans etc

a friend did almost the same project only that he uses led to demonstrate the appliances part where he needn't to consider 240V ac supply from ac mains. here is where i got it all confused.

1)how do we isolate the high voltage from mcu and pc?
-i googled around and found this. http://www.codeproject.com/csharp/control_...&select=1286423
It says opto coupler isolate the pc from ac power supply. How about the relay?i only heard about these two components over a year ago. so, complete noob here.

2) i want to add a dimmer circuit connected to my lamp/bulb.

pc>mcu>dimmer>lamp>ac mains

i should add an opto coupler between mcu and dimmer, no?


my primary concern is safety.So i need some assurance that this will not blow up on me. *Hee*

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Added on September 10, 2008, 8:44 pmhelp, anyone?

This post has been edited by sshlady: Sep 10 2008, 08:44 PM

Buying microchip online? Just go to http://www.farnellinone.com/ << can buy 1 unit and student get 10%discount

Thanks for the list of companies..really helpful..

Just got 1 electronics kit from escol...want to try after raya

This post has been edited by f1shb0n3: Sep 30 2008, 10:01 AM

hey guys... I need help in building my very very very 1st robots.... the prob I having now is to get the materials... where I can get those parts selling in www.techsupplies.co.uk and http://www.solarbotics.com in malaysia?

for those who just can't stop tinkering, disassembling, re-creating and inventing cool new uses for the technology in our lives


i'm going less technical with the explaination. What youre planning to to do is actually quite easy. On a parallel port (That LPT1), each 'ON' state supply 5v on the each of the 8 output pins.

so what you should do is pretty much use that 5v to flick a wall switch. That where the relay comes in. the 5v will drive the relay which will to turn on another circuit, in this case the AC 240 main switch for the appliance. Your friend on the other hand uses that 5v directly to light up an LED.

How to achive the ON state on the pins, is by programmatically duping the PC into believing it's talking to a printer/etc thru the parallel port.

the guide above pretty much explains that, and it comes with the DLL that simplifies the process. But you still need to be handy with VB.NET/C# to make any good use of it. write a code that call the DLL and use the HEX addressing to trigger the ON state on the pin u choose. each pin will have one relay, tht switch one circuit, that will turn ON one appliance.

The opto coupler are there to protect your PC's motherboard from back EMF coming from the parallel port. It's good to have if you love your PC, but not a nessessity to get it to work.


And finally, do you want to control the dimming from the PC as well? If yes, then thereare two approach to that, mechanical approach or by using a controller. Well go to that once you've experimented with the above guide and understands the "idea" first.