HOW TO MAKE FULL DISCRIM. PULSE INDUCTION MACHINE UNDER 50 BUCKS

		Quote:			Posted by ppodg
	Several version of hex are obtainable, some fellow even sells PCBs, but my recommendation is: 1. get at least the newest hex 2. simulate it or just load to the mega8 and force to run 3. get all signals to a scope 4. try to write your own timing 6. well... try to write your own analysis... based on Candy's patent work... and meanwhile go to a better uc ie simply create your own detector!  I've never built this detector (nor going to build), but its general conception is very interesting - only few plain electronic parts and the advanced pulsing&analysis. What is more, the physical device can be even simplified.

Thanks for suggestions. Comments from my poits of view:

1. Will do so.
2. Plan to load to the mega8 and force to run.
3. Intend to controll all steps and precedure by scope.
4. To write my own timing? Maybe I can play with timing definition if I have decompiled code, but I havent and I am not able to dissasemble Chance code. I can programing uc with given code, but to write my own code is something out of my knowledge at the moment. I think for most of us interesting in Chance so.
5. To write my own signal analysis code? Much harder than timing alone. Unrealistic for most of us. But this can stay as challenge for future.

You say "go to a better uc". Can you explain your view about adequate uc for Chance like configuration of MD? Which features and capabilities should have such uc? Or which concrete type do you have in mind?

I am going to build it. Not in near future because of some other obligations, but I am in collecting parts.




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		Quote:			Posted by ppodg
	4. a. get the complete mega8 datasheet and assembler mnemonics/code b. find timer loading operatios c. try to load your own data (this will be a trial&error procedure) 5. a. uc - up to you, but fast, at least 16-bit with a fast 12-bit a/d. I prefer arm cortex family. b. for avr play use atmel's avr environment (assembler only), embedded pascal for mega8 by e-lab or gcc (I hate c!!); for arms - gcc or demo/student versions of keil, iar or atollic. All these tools are free. I hope this is NOT your first PI!  I hope this is NOT your first uc project as well!

Thanks, I have very little experience with uc. 10 years ago I play with AVR for short time and not in field of MD. So this is my first uc PI. At the same time not my first PI. I build my first PI in autumn 1985, very succesful, it was my first satifactory working detector after different crapy BFOs and one VLF/IB. I am experienced with PI enough (build about 10 Pi from that time and finalize 7) and have well equipped electronic hobby lab.

So a have still some question regarding uc use in this PI. Par example: it is not clear to me (nothing in schematic about) if in Chance used AT Mega8 can control 16x2 display directly or we need to use some LCD IC drivers between uc and LCD? Assume that LCD driver/controler is built in LCD but I am not sure (i didnt buy LCD for Chance yet)?

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For a LCD I found 16x2 Line LCD Module w Backlight HD44780 2x16 Character for $3.60 on

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Uses a HD44780 driver chipset which I have read is compatible with Atmega8.

Can't decide which programmer to use for the Atmega8. Like to get a usb programmer but thinking of using Ponyprog which uses parallel or serial interface.

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If you looking for parts or programmers go to

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http://www.thunting.com/smf/index.php/topic,7657.msg165008.html#msg165008

bonjour Luc,

je possede un OKM explorer 4000
Etant un gradiometre, il ne d?tecte pas les m?taux diamagnetique  tel que l'or.
J'aurais voulu m'en servir de data loger coupler ? un PI.
Pourrais tu me dire les caract?ristiques de ce PI.
Merci beaucoup pour tes renseignements

cordialement

gilles

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CharlesGes