Digital Bike Tachometer Circuit Schematic Diagram


Posted on Feb 5, 2014

This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of the wheel where permanent magnets pass by. The permanent magnets are attached to the wheelspokes and activate the reed switches everytime they pass by it. The speed is digitally displayed. The ta


Digital Bike Tachometer Circuit Schematic Diagram
Click here to download the full size of the above Circuit.

chometer circuit works according to this principle; the pulses created by the reed contacts are counted within a certain time interval. The resulting count is then displayed and represents the speed of the bike. Two 4026 ICs are used to count the pulses, decode the counter and control two 7-segment LED display. RS flip-flops U3 and U4 function as anti-bounce. The pulses arrive at the counter`s input through gate U7. The measuring period is determined by monostable multivibrator U5/U6 and can be adjusted through potentiometer P1 so that the tacho can be calibrated. The circuit U1/U2 resets the counters. Since batteries are used to power the circuit, it is not practical to support the continous display of speed information. This circuit is not continously active. The circuit is activated only after a button is pressed. At least three permanent magnets must be installed on the wheel. The circuit can be calibrated with the help of another precalibrated tachometer. You are reading the Circuits of Digital Bike Tachometer Circuit And this circuit permalink url it is




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Ujt-battery-charger
    Voltage-to-frequency-converter
    Time-Delay Auto-Kill Switch Circuit
    Photo Strobe Circuit
    LED Flasher Circuit Using 555 Timer IC Schematic Diagram
    Eico667 troubleshooting
    audio-circuits
    Digital thermometer circuit based on CA3162 CA3162 and LM35
    metal detector project circuit
    Boss SD-1 Super OverDrive guitar pedal schematic diagram
    The SDR-1000
    You Have Mail!
    Transcranial magnetic stimulation
    Quadraphonic Amplifier
    Optional delay schematic division factor
    A house automatically fill light circuit
    Automatic electrical circuit limit



    Top