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Tachometer/RPM.
Easy to build using only a few components. With some modifications, it can be used in an automobile. This Tachometer uses a PIC 16F628.(06/12/2004)
Source: http://www.josepino.com/?tachometer1 Tags: microcontroller
circuits
automobile
homemade
CODE: JP6283 - PIC: 16F628
This digital tachometer can measure up to 30,000 RPM (or maybe more, none of my motors can rotate more than 35,000 rpm). Here is the pinout information:
Taken from http://www.josepino.com
Pin 3 defines the Display type: Common Cathode or Common Anode.
Pin 4 is the signal input, you can use optical sensors (Fototransistors, fotoresistors, etc), magnetic sensors (Hall effect, reed switch, etc) or using a switch.
DO NOT CONNECT ANY SIGNAL DIRECTLY TO PIN 4. High voltages can damage the PIC. If the input signal is more than 5 Volts, Use a driver as TTL, CMOS, Amp Operational or Transistors.
The RPM are divided by 10 when displayed, That means, a reading of 1200 means 12,000 RPM.
Download the HEX code
HERE
NOTE: Use only 10Mhz xtal and 22pf or 33pf capacitors.
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07/30/09 - 11:48:15 ramankannan from chennai wrote: realy nice it is very simple circuits and continue your work
09/19/09 - 08:56:54 Riaz from Karachi wrote: Can i use this in my auto connecting directlly to coil -v point
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