AT90s2313 based LED tachometer

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student1616

New Member

• Oct 16, 2006

• #1

hello all,
i found this site while i was searching for some good microcontroller forum.iam
trying to make LED based tachometer for my motorcycle.
**broken link removed**
i want to drive 20 LEDS using AVR like AT90s2313 or ATTINY2313.why these
bcz i already have 2 microcontrollers each.
for input signal to the microcontroller,iam using the method of
inductive pickup (wounding a thich copper wire over the sparkplug
cable).
**broken link removed**
i'll be thankfull if someone could show me a schematic and code for
this.
thanks
student

 

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penoy_balut

New Member

• Oct 17, 2006

• #2

schematic would be a simple conditioning of the input voltage not to exceed input level of the MCU, you only need the edge to trigger an interrupt. Out put would be a 2 pin data and clock for shift registers to drive any number of leds you want. Coding would be counting the number of pulse for a certain period of time.

 

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student1616

New Member

• Oct 18, 2006

• #3

thanks..
can i have a rough schematic and program for this.
i know i shld'nt ask like this but iam completely new to these microcontrollers.and this is the only circuit that i need to finish.so can someone help me with this issue.
thanks

 

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penoy_balut

New Member

• Oct 18, 2006

• #4

it takes time to draw the schematic and a little more for coding, where is your location?

 

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student1616

New Member

• Oct 18, 2006

• #5

basically iam from california.(now iam in india for my project work)
i'll be waiting for your reply regading the schematic and code.
once again thanks for the help

 

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penoy_balut

New Member

• Oct 18, 2006

• #6

Visit Atmel AVR site, there are plenty of Indian AVR experts listed as consultants.

 

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student1616

New Member

• Oct 20, 2006

• #7

thanks i mailed a guy regarding this circuit.i did't get any reply till now.
mean while some help for schematic and code will be appreciated

 

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student1616

New Member

• Oct 30, 2006

• #8

guys while searching on google i come across a great site with tachometer thread (http://www.mikrocontroller.net/topic/1518).there's lot of information.i tried to translate and found 2 circuits
https://www.mikrocontroller.net/attachment/436/drehzahlmesser.GIF
https://www.mikrocontroller.net/attachment/439/01.gif
but not sure which one is good? and what modifications required to make it work for 1-cylinder 4-stroke engine

 

gramo

New Member

• Nov 2, 2006

• #9

you could make life alot easier getting a serial led display. that way to update data on the 4 displays is done over 4 wires, and the programming in pic basic would be somthing like


Dim Variable[4] As Byte
Symbol Data_Line = PortA.1
Symbol Clock_Line = PortA.1

Main:

Variable = COUNTER Input_Pin , 100 ' Count how many cycles occur over 100ms

Variable = Variable / 200 * 3 ' I have no idea what the equation would be, but convert the value to RPM

SHIFTOUT Data_Line, Clock_Line, MSBFIRST,[Variable/4] ' Send it out

Goto Main ' Do it all over again