Electronic – fabricate a PCB using this schematic

circuit analysispcbschematic

I am a newbie to schematic and electric circuit design. This is one of my first schematics and I am thinking of making a PCB out of this one.

I want to ensure my PCB will work after fabrication. It uses an ATmega328P as microcontroller and also has an MLX sensor, an LCD and an ultrasonic sensor.

I have attached the schematic with this post.

Please give me suggestions if you have any. I want to know whether my PCB will work or not if I fabricate it using this schematic.

SCHEMATIC IMAGE

Best Answer

No one can tell you for sure if it will work. It probably won't.

Too many of your parts don't have model numbers.

  • VR1 appears to be a 5V regulator. Which one? Without a datasheet or at least a part number, no one can tell you if you have it connected properly and have used the correct input and output capacitor types and values.
  • You have some unknown LCD in the circuit, and have not connected half of the data lines. Maybe that's correct for your LCD, but I doubt it.
  • You have a buzzer connected directly to the microprocessor. That probably won't work well since microprocessor pins can only deliver a few milliamperes of current. Maybe your buzzer would work. Nobody knows - no datasheet or model number.
  • What is U1? No model numbe or anything else. No one can tell you if it is connected correctly.
  • Which MLX sensor? They make many. No model number, no datasheet.
  • Which ultrasound sensor? No model, no datasheet, no idea.

You have no decoupling capacitors at all for the microprocessor. Sometimes (when the stars align and the monks in a temple somewhere mutter the proper incantations) that works. Sometimes it works well enough that you think it is fine - until it suddenly doesn't work and you can't see any reason for it to have changed.

If you made a PCB from this circuit, it might do something but it probably won't work as you intended it to.

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