Hacked Gadgets Forum

October 21, 2007

PIC 12F683 Microcontroller Based Logic Probe

at 11:52 am. Filed under Cool Gadgets, DIY Hacks, Electronic Hacks

Have a look at this cool PIC 12F683 Microcontroller Based Logic Probe.

“The purpose of this device is to test a wire to determine the logic state. Two LEDs show the logic state as either high, low, or high impedance (aka floating). Simply attach the ground probe to any ground connection of the circuit you want to test, then touch the test probe to the signal you want to test.

First, this device determine if the wire is floating, this is done by applying a weak current into it with a pin on the microcontroller and see if the state changes, and draw a weak current from it using the pin and see if it changes. The current is weakened by the 10k resistor attached to the pin, commonly called a pull up or pull down resistor if used for this purpose (overriding the state of a floating wire). If the state changes, it means the wire is floating, and the device indicate that using a LED.

If it’s not floating, then the voltage on the wire should indicate a logic high or low, and the device indicate that using another LED.”


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2 Responses to “PIC 12F683 Microcontroller Based Logic Probe”

  1. feki00 Says:

    Would be cool if its not waste a pic. If u decide to build this i advise wait a little and check http://members.cox.net/berniekm/super.html this out…

  2. Bahar Says:

    thank you for share it.
    i want some more information about LOGIC PROBE and kinds of it.
    it’s my project in my un
    plz help me about it.
    i designed it with ICs and LEDs
    i’m waiting for ur help

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