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Offline mollaxTopic starter
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« on: May 08, 2011, 05:01:42 pm »
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cloneAVR



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« Reply #1 on: March 06, 2015, 09:45:03 pm »
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Dear Sir,

I am trying to build the Clone PI AVR Metal Detector, it is for my college project. But i want to modify it a bit, i want to drive a relay with the Atmega controller to turn on a Red Flasher Light too!. You have uploaded the hex code & assembly code, but iam not that sound programmer in assembly language. It will be really helpful if you can provide the source code (C/C++ program) and also help me how to interface the relay with it.

The shall work as following:
1. On detecting the metal the relay will turn on.
2. It will keep a flasher light and hooter on until the reset button is pressed.
3. There will also be a provision to bypass the relay and work normally.

Kindly please help me with the C/C++ program

Regards,




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« Reply #2 on: March 08, 2015, 10:07:41 am »
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Other that for the food industry your relay idea is useless but you can still get the relay to turn on and stay on by using the output to the buzzer from the PIC, by doing it this way you will not have to change the code.

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« Reply #3 on: March 08, 2015, 12:35:39 pm »
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Yea actually i hope this idea can be used for diffenet sectors, one of which can be for food factory as you explained. but if i connect the relay with buzzer, it will stay on as long as the metal is near to the coil. Can you please help me with the assembly code, the statements are written in Russian which i cannot understand..! do you have the English version of it..

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« Reply #4 on: March 08, 2015, 02:51:59 pm »
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No I do not have an English version of this detector nor do I have the c code for it but like I said you can get the relay to stay in the on position even once the metal has been removed from the coil. Here is an idea on how you can go about it. First you will need to take the signal from the PIC to a transistor used as a switch then when the relay is turned on you need to use the one switch of the relay to continue to power up the relay coil. By placing a push button (NC) switch in your circuit when pushed the circuit will be open and the relay will drop until the next time that you have a piece of metal in front of your coil.   

Posted on: March 08, 2015, 09:34:53 pm
This should work for what you want it to do.

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« Reply #5 on: March 08, 2015, 08:19:37 pm »
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Thanks a lot Sir, let me try, I will come back to you...

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« Reply #6 on: March 19, 2015, 10:46:28 pm »
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Hello Sir, I have worked on the given circuit and program, it have worked successfully, however there was some flix in the asm program, which i latter rectified and solved, there is a endless loop that created problem in detection. I have also converted the Vietnam version to English, soon i shall post it to you, presently working on transfering the code to C/C++.

But I am going through only one problem now, i can not chalk out the coil dimension, I have made one coil of 446uH and another of 830uH, the coil of 446uH has detection height upto 130mm with pretty bigger piece of metal like a tin can, and the coil with 830uH is detecting the same object at height of 200mm. But i want to detect a coin at a height of minimum 600mm. Can you please help me with it?



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« Reply #7 on: March 20, 2015, 04:26:44 am »
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PI coils normally run at about 250uH you will need to check with the designer as to what wire gauge, inductance and coil size it was designed for.

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