• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

motorcycle CDI

Status
Not open for further replies.

an2

New Member
i've found this schematic circuit... but the problem is..idunno how to read it...:confused: can some one help me... what the partlist, and how to construct this device...




:confused: :confused: :confused: :confused: :confused:
 
Last edited:

Nigel Goodwin

Super Moderator
Most Helpful Member
The 16F84 is a standard old PIC, you need a PIC programmer to program it - try reading the 'sticky' in the micro-controller forum.

Presumably you have the code to program in the chip?.

What does the RS232 interface allow you to do?, the 16F84 has 64 bytes of non-volatile memory, perhaps it's for storing parameters there to alter preformance?.
 

an2

New Member
yes, i have the .hex file.. also the .asm of the CDI.. but need to build th PIC programmer hardware first... i've found the simplest Pic programmer in the net.. (if you have some other way please let me know)

is it hard to do this device?? i really2 zero about electronic...
 

jpanhalt

Well-Known Member
Most Helpful Member
Nigel's supposition is correct. The microcontroller is there to adjust the spark advance according to engine speed. It allows for easy starting and then changes according to speed for more power. The hobbyists use a table look-up for the advance settings. See: http://www.rcuniverse.com/forum/m_4344316/tm.htm

In answer to "how does it work," the 400V capacitor connected to the spark coil is charged with rectified current from the alternator, then rapidly discharged through the BT151 SCR , which causes the ignition coil to generate the high voltage (inductive
kick) needed to fire the spark plug. The microcontoller provides the pulse needed to fire the SCR. The pick-up is frequently a Hall sensor, which provides timing information to the microcontroller.
 

DEEE

New Member
Hi dear,

I can build the circuit, and I have a pic programmer but don't have the hex code file, if u have it please send me
 
Last edited:

mneary

New Member
This thread provides a lot of information. What do you not understand? Please ask specific questions.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading

 
Top