Inductive Spark Plug Sensor Engine RPM Meter Shift Lights Schematics



Inductive Spark Sensor Schematic



Signal driver (Schmitt Trigger)



7-Segment LED Displays Driver



Shift Light LED's Driver



Dip Switches Configuration table 


12V to 5V power supply

11 comments:

  1. I think that the zener and the 1n4148 in the sensor schematics are useless. The transistor maximum Vbe is 0.8V so a 5.1V zener would never work! Also you already have a rectifying diode next to the coil, why do you need to place another(The 1n4148 one). I suggest to add a 220 ohm resistor on the base pin because the junction PN is a diode, whit very small current capability

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  2. Shouldn't the ground of the Schmitt Trigger be at 7?
    In the circuit diagram its given at 1.
    Secondly in the photograph of the circuit you are not using the Zener Diode,Why?

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    1. And in the actual circuit,you have also connected the pin 1 and 2 of schmitt trigger to ground,Can you please explain why?

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    2. It's 1 and 3. All the inputs that not in use, shold be grounded. For better behavior.

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  3. hello, I did everything like this,but my sign are full of noise and the output voltage is maximum 400mV to the arduino.
    The maximum voltage for the input circuit is 480mV between the two wires of the pick-up coil...
    I think it's supposed to be a sign of more or less 5v for arduino and a signal without noise and square wave...is correct? What can be wrong? Will be my pick up coil? I already have 12 turns on the spark plug.

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  4. Pin 9 connected display 7 segment
    pin 9 connected Shift Light LED's Driver red

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  5. can you please provide me all the specification of all the electrical components you have used in these circuits???

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    Replies
    1. Hello, do you know already all the electrical components he have used? Can someone help me with this? Please

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    2. Hello, do you know already all the electrical components he have used? Can someone help me with this? Please

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  6. I cannot read some of the handwriting.

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