PIC IB

[Rudolf]

Hi folks
Gonna try building a PIC IB detector.
Any suggestions?

Lots of thks in advance

[David]

Re: PIC IB

I have thought about building an IB with a microcontroller but for the time and effort I think I would go ahead and use an Mcore instead of a pic this would leave plenty of room for upgrade. I would use a NCO driving an amplifier for the transmit. This would allow lots of operator control of output level and frequency while keeping every thing in sync.

[Sean Goddard]

Re: PIC IB

Check out the motion machine I posted earlier on this forum.

It is designed to have a PIC glued on the back end of the analogue circuit, but could also be modified if you drove the Tx coil using a shaped/filtered pulse output from the PWM output of the PIC.

Alternatively, you could use a dual port RAM and load a waveform into it from the PIC, then use a programmable divider like a series of daisy chained 4094 rate mutlipliers, and 74373 to latch the divisor digit. This would geive you programmability to be able to "clock out" the wave from at any frequency you desired.

The amplitude of the output could be controlled using another DAC to change the refenrence of the ourput DAC, thus giving fine tune ofver the output levels. For couarse control use a switched gain amlpifier stage.

The possibilities using this system are fairly unlimited, even down to putting filters o nthe output stage and driving the Tx with a dual frequency system by digitally mixing and forming the waveform in the DP RAM wave bank.

The rest I leave to your imagination!

[David]

Re: PIC IB

I think I like you, I have been a technician for many years working with everything from pinball machines to space shuttle launch prossesing systems and down hole nuclear magnetic resonance logging tools, but in all this time I have not met any other techs or engineers that are interested in metal detectors. I apreciate your replies.

[sevzirfo]

Re: PIC IB - Look on the real circuits

Hi!
Look on these sites -
http://alteh.narod.ru/audio.html (VLF - PIC16F84) + asm code
http://mikaml.narod.ru (VLF - AVR AT90s8535) Fazitron ADM, Ds

I have written beta version the program for the microcontroller AVR at90s2313-10pi.
The microcontroller generates pulses with adjustable frequency 1.5kGz - 60kGz and
By adjustable phase 0 - 180 degrees. The frequency and phase can be kept in EEPROM. Is realized ïðîãðàìíûé the discriminator on colour and black metals.

The microcontroller can be established in the circuits Whites Classic 1-3 and Tesoro Bandido2umax. The program will be free-of-charge

sevzirfo

[Pedro]

Re: PIC IB

Hi Rudolf,

I'm with a problem similar to yours...

I’m a newbie in metal detectors, I work mainly in digital electronics (FPGA with VHDL)
I’m building a “Bandido” prototype board to learn a bit more and test the conversion of most of the analog circuits by digital ones may be a PIC with a CPLD or a small FPGA (maybe a PIC core inside an FPGA)
I’m learning... if you need some help, just ask!

Read all the forum!!!
There are people here with knowledge to build a top of art metal detector
Difficult is to tune all this knowledge in the way to build a free global project...
But I believe that if it happens it would be a nice project to work in and see it grow...

Who knows... One day...

[Rudolf]

Re: PIC IB - Look on the real circuits

Already seen. Nice links but no PCB
Thanks anyway!