Summary of MICROCONTROLLER CONTROLLED METAL DETECTOR PROJECTS
The article describes several microcontroller-based metal detector projects (ClonePI variants) using PIC and AVR families (PIC18F252, PIC16F873(A), ATmega32, ATmega8). It notes firmware/hardware specifics, display options (LCD or LED), discrimination goals, ADC/oversampling techniques, and wiring/ resistor modifications for correct operation.
Parts used in the Microcontroller Controlled Metal Detector Projects:
- PIC18F252 microcontroller
- PIC16F873(A) microcontroller
- ATmega32 microcontroller
- ATmega8 microcontroller
- LCD display
- LED display
- Coils (reels) - korzinochnymi reels
- Resistor R21 (may need shorting in some firmware versions)
- Power supply (battery or supply providing current and voltage measurement)
- PCB and wiring for sensor coil and control circuitry
Result of displays in the form of two scales, which are estimated to judge the material goal.In addition, the screen is small scale level of response and the current supply voltage. PIC18F252 The program… Electronics Projects, Microcontroller Controlled Metal Detector Projects “avr project, microcontroller projects, “
Result of displays in the form of two scales, which are estimated to judge the material goal.In addition, the screen is small scale level of response and the current supply voltage. PIC18F252 The program is intended for controller PIC18F252.The controller PIC16F873 (A) to this version can not be used. This is more demanding to resources controller. 252nd compatible controller on “pins” with 873 – m and can be programmed by the same programmer. The program workable only with korzinochnymi reels! R21 For this firmware needed zakorotit resistor R21 (in the old version of the scheme). In this version the appointment of buttons changed to read
PIC16F873A METAL DETECTOR CLONE PI
ATMEGA32 METAL DETECTOR CLONEPI-2
ClonePI-2 is a further development of the project ClonePI). The main objectives in the design – to get discrimination metals
ATMEGA8 METAL DETECTOR CLONEPI AVR
ClonePI AVR is a so new simplistic solution pulse metal ClonePI)
# Use ATmega8 controller available from Atmel.
# Instead of using an external ADC ADC internal controller.
To get the same sensitivity as to the external ADC, is used oversampling.
# Use taktirovanie of internal RC-generator controller.
ATMEGA8-16PI METAL DETECTOR CLONEPI-W
Instead of LCD used LED display. Cut down on administration, leaving only the most necessary. Take into account some errors in previous versions.
MICRICHIP, ATMEL AVR Microcontroller Controlled Metal Detector Projects all files source: MICROCONTROLLER CONTROLLED METAL DETECTOR PROJECTS download: microcontroller-controlled-metal-detector-projects.RAR alternative link2 alternative link3
- Which microcontroller is the program intended for?
The program is intended for the PIC18F252 controller. - Can the PIC16F873(A) be used with this version?
No, PIC16F873(A) cannot be used with this version because it demands more controller resources. - Are the 252 and 873 controllers pin compatible?
Yes, the 252 is compatible on pins with the 873 and can be programmed by the same programmer. - What displays are used in different ClonePI versions?
Some versions use an LCD display, while the ATMEGA8-16PI version uses an LED display. - What technique is used to replace an external ADC on ATmega8?
Oversampling of the internal ADC is used to achieve similar sensitivity to an external ADC. - Does the firmware work with specific coils?
The program works only with korzinochnymi reels (specified coil type). - Is any resistor modification required for the firmware?
Yes, for this firmware resistor R21 needs to be shorted in the old version of the schematic. - What was a main objective in the ClonePI-2 design?
The main objective was to achieve metal discrimination. - What clock source is used for the ATmega8 in some versions?
The internal RC oscillator of the controller is used for clocking. - Where can source files for these projects be obtained?
All source files are available in the microcontroller-controlled-metal-detector-projects.RAR download and alternative links listed in the article.
