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From www.micro-examples.com
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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. | 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. | ||
| − | Oscillator frequency is then divided and pushed to a piezo speaker. | + | Oscillator frequency is then divided by 4 by the PIC and pushed to a piezo speaker. |
It shares the same idea as [[PicoDetector]], the metal detector. | It shares the same idea as [[PicoDetector]], the metal detector. | ||
Revision as of 18:58, 7 February 2012
An ultrasonic bat detector with only 3 components !
Contents |
PicoBat : a PIC-based simple and cheap ultrasonic detector
Let me introduce PicoBat to you with this short video clip :
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.
Oscillator frequency is then divided by 4 by the PIC and pushed to a piezo speaker.
It shares the same idea as PicoDetector, the metal detector.
Circuit Schematic
- 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 picoDetector_project.ZIP file for mikroC : File:PicoDetector-project.zip
Includes :
- mikroC PRO project files for PIC12F683, should work also with most of PIC
- picoDetector C source code
- picoDetector .HEX files