Distributor Pulse Reader

mauricioscotton · 7th June 2010, 04:33 PM

This is my first post.... =)

I'm trying to read pulses from Distributor...
What i need: The analogue pulse from coil must be converted for PIC16f877A can read this pulse.
the pulse should be ON and OFF, i'm reading state of pin RA0.

thanks anyway.

Mauricio Scotton

EBM_dude · 10th June 2010, 12:57 PM

You mean a car's distributor? What type of ignition is it using? Breaker contact or transistor?

mauricioscotton · 10th June 2010, 01:24 PM

EBM_dude, thanks for reply...

Yeah, it's from car distributor... i'm using the original Volkswagen igntion...

i'm using a NPN transistor to convert negative pulses to read...
but, my new idea is: read voltages... with a LM3914...

do you have any transistor pulse reader circuit?!

thanks anyway!

Mauricio

wakibaki · 10th June 2010, 03:22 PM

You want to read every pulse? Or just one cylinder?

You can see every pulse at the points. Connect a high resistance (1M), or resistive divider (pot?) across tha points. Measure between the chassis and the pot wiper using a high resistance (oscilloscope) to see what output you are getting.

w

chris661 · 10th June 2010, 07:06 PM

Welcome to the forums.

EBM_dude · 15th June 2010, 12:34 PM

You could go for an easy one here: wire a small glow-discharge lamp and a resistor in parallel to the PRIMARY of the ignition coil. when the breaker point interrupts the current to the coil, it will create its many kV on the secondary but also like 200 VDC on the primary. This will ignite the glow-discharge lamp. Now a simple photo transistor can pick up this signal for your PIC.

dangus · 17th June 2010, 08:36 PM

Look at the schematics of tachometers and dwell meters to see how they do it. The LM2907/LM2917 data sheet and application notes are one place to start.

7th June 2010, 04:33 PM	#1
mauricioscotton diyAudio Member Join Date: May 2010	Distributor Pulse Reader This is my first post.... =) I'm trying to read pulses from Distributor... What i need: The analogue pulse from coil must be converted for PIC16f877A can read this pulse. the pulse should be ON and OFF, i'm reading state of pin RA0. thanks anyway. Mauricio Scotton

10th June 2010, 07:06 PM	#5
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	Welcome to the forums. __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

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10th June 2010, 12:57 PM	#2
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	You mean a car's distributor? What type of ignition is it using? Breaker contact or transistor?

10th June 2010, 01:24 PM	#3
mauricioscotton diyAudio Member Join Date: May 2010	EBM_dude, thanks for reply... Yeah, it's from car distributor... i'm using the original Volkswagen igntion... i'm using a NPN transistor to convert negative pulses to read... but, my new idea is: read voltages... with a LM3914... do you have any transistor pulse reader circuit?! thanks anyway! Mauricio

10th June 2010, 03:22 PM	#4
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	You want to read every pulse? Or just one cylinder? You can see every pulse at the points. Connect a high resistance (1M), or resistive divider (pot?) across tha points. Measure between the chassis and the pot wiper using a high resistance (oscilloscope) to see what output you are getting. w

15th June 2010, 12:34 PM	#6
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	You could go for an easy one here: wire a small glow-discharge lamp and a resistor in parallel to the PRIMARY of the ignition coil. when the breaker point interrupts the current to the coil, it will create its many kV on the secondary but also like 200 VDC on the primary. This will ignite the glow-discharge lamp. Now a simple photo transistor can pick up this signal for your PIC.

17th June 2010, 08:36 PM	#7
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	Look at the schematics of tachometers and dwell meters to see how they do it. The LM2907/LM2917 data sheet and application notes are one place to start.

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