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An ultrasonic bat detector with only 3 components !
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[[File:PicoBat.jpg|thumb|PicoBat running on a bread board]]
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An ultrasonic [[wikipedia:Bat detector|bat detector]] with only 3 components !
  
 
==PicoBat : a PIC-based simple and cheap ultrasonic detector==
 
==PicoBat : a PIC-based simple and cheap ultrasonic detector==
Let me introduce PicoBat to you with this short video clip :
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A short video clip is sometimes better than a long explanation :
 
{{#ev:youtube|EjEkXlET0CM}}
 
{{#ev:youtube|EjEkXlET0CM}}
  
The idea of this circuit is to hack PIC oscillator circuit, by replacing the crystal by a piezo sensor : the frequency of the oscillator will depend on presence ultrasonic waves.
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The idea of this circuit is to hack the PIC oscillator circuit, by replacing the crystal by a piezo sensor : the frequency of the oscillator then depends on [[wikipedia:Ultrasound|ultrasounds]].
  
Oscillator frequency is then divided and pushed to a piezo speaker.
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Oscillator frequency is then divided by 4 by the PIC, and pushed into a piezo speaker.
  
 
It shares the same idea as [[PicoDetector]], the metal detector.
 
It shares the same idea as [[PicoDetector]], the metal detector.
Line 64: Line 65:
  
 
==Download project==
 
==Download project==
Download picoDetector_project.ZIP file for mikroC : [[File:PicoDetector-project.zip]]  
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Download PicoBat-project.zip file for mikroC : [[File:PicoBat-project.zip]]  
  
 
Includes :
 
Includes :
  
 
* [[mikroC PRO]] project files for [[PIC12F683]], should work also with most of PIC  
 
* [[mikroC PRO]] project files for [[PIC12F683]], should work also with most of PIC  
* picoDetector C source code  
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* picoBat C source code  
* picoDetector .HEX files
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* picoBat .HEX files
 
[[Category:Projects]]
 
[[Category:Projects]]
 
[[Category:PIC12]]
 
[[Category:PIC12]]
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==Discussion and comments==
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{{#w4grb_rate:}}
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<discussion />

Latest revision as of 21:55, 12 February 2012

PicoBat running on a bread board

An ultrasonic bat detector with only 3 components !

Contents

PicoBat : a PIC-based simple and cheap ultrasonic detector

A short video clip is sometimes better than a long explanation :


The idea of this circuit is to hack the PIC oscillator circuit, by replacing the crystal by a piezo sensor : the frequency of the oscillator then depends on ultrasounds.

Oscillator frequency is then divided by 4 by the PIC, and pushed into a piezo speaker.

It shares the same idea as PicoDetector, the metal detector.

Circuit Schematic

PicoBat-circuit-schematic.png

  • The ultrasonic piezo receiver replaces resistor in PIC oscillator circuit
  • SP1 is any piezo speaker you have

C Source code

/*
 *******************************************************************************
 * picoBAT : an ultra simple ultrasonic bat detector
 *******************************************************************************
 *
 * Author : Bruno Gavand, February 2009
 * see more details on http://www.micro-examples.com/
 *
 * source code for mikro C compiler V8.2
 * feel free to use this code at your own risks
 *
 * target : PIC12
 *
 * PIC PIN Assignemnt :
 *
 * GP0 GP1 : piezo speaker
 * GP5 : ultrasonic transducer receiver
 *
 *******************************************************************************
 */

void    main()
        {
        /*
         * configure GPIO as digital port
         */
        CMCON0 = 7 ;
        ANSEL = 0 ;

        TRISIO = 0 ;
        GPIO = 0b01 ;

        for(;;)
                {
                /*
                 * toggles speaker outputs
                 */
                GPIO ^= 0b11 ;
                }
        }

No, there is no mistake, full source code is above !

Download project

Download PicoBat-project.zip file for mikroC : File:PicoBat-project.zip

Includes :

  • mikroC PRO project files for PIC12F683, should work also with most of PIC
  • picoBat C source code
  • picoBat .HEX files

Discussion and comments

Current user rating: 75/100 (60 votes)

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