PIC16F628 as digital Tachometer


Posted on May 24, 2012

Pin 3 defines the Display type: Common Cathode or Common Anode. Connect this pin to GROUND if you are using common cathode 7-segment led displays. To use common anode displays, connect it to VCC (positive) 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. Unfortunately, I have no idea how to connect this circuit to a vehicle. If you want to share details about how to attach this circuit to an automovile, I will post this information.


PIC16F628 as digital Tachometer
Click here to download the full size of the above Circuit.

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. NOTE: Use only 10Mhz xtal and 22pf or 33pf capacitors. The RPM are displayed as units, that means, the RPM indicated in the display is the actual reading from the input pin. This version have a faster sample rate so the reading is constantly updated, you get a faster reading that the previous version.





Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

LX-800 Chaser & Strobe
Knight Rider Lights
Dew sensor circuit
Lights Control for Model Cars
Simple Square Wave Generator Circuits
a voltage-controlled current sink / voltage-controlled resistor
Brake Light Signal Module
Harnessing Solar Power with Smart Power-Conversion Techniques
1929 MOPA 80 meter transmitter using a pair of 27 triodes to an 865 tetrode
Electronic counter with automatic counting interface circuit a



Top