[757labs_rov] 757 Labs Underwater ROV Project - Metal Detector

Wed Mar 30 20:40:47 EDT 2011

757 Labs Deep Sea Explorers;

     I have been slowly plugging along on the Underwater ROV Sensor 
Module.  Here's a status of where I am. (I hope I can send large attachments.)

     Good Luck!
     Ken_S.

At 03:47 PM 2/27/2011, Almost_There at COX.Net wrote:

>757 Labs in the Deep Blue Sea;
>
>     I had good initial success with a breadboarded Metal Detector 
> using a makeshift coil that was nothing more than a few turns of 
> wire wrapped around a Tupperware Container.  Oscillated at ~630 KHz 
> @ ~3.5 Volts p-p, and varied by about 40 KHz as brought it closer & 
> further away from my metal case Laptop (I just happened to be 
> building on top of the Laptop Case.)
>
>     The plan is to have the a MicroController read the Frequency of 
> Oscillation at Power-Up, and ever after report the change from that 
> Frequency (the Delta) in an RS-232 Serial Stream, and optionally in 
> a PWM signal (like a Servo Control Signal.)  I'll bring out all 
> wires necessary for power, reprograming the CPU, & Signals, and 
> bury the whole thing in Epoxy to water-proof it.
>
>     Questions:
>     Q1) Will this thing be fed a regulated voltage (i.e. 5V, or 
> 3.3V) or will it need to have its own voltage regulator?
>
>     Q2) I found this used Military Detector Coil Head on E-Bay...
> 
>http://cgi.ebay.com/Used-Military-Metal-Detector-COIL-HEAD-Mine-detector-NR-/250779627055?pt=LH_DefaultDomain_0&hash=item3a63a16e2f 
>(link only valid until Mar 04, 201113:22:30 PST)
>         Is it important from a "pride" standpoint that we build 
> everything (as much as is practical) from scratch, or should I bid 
> on this Coil Head?  (Winding a coil is pretty darn easy, but it may 
> not work as well as the Mil-Grade one; then again, the Mil one may 
> not oscillate at the frequency we need.)
>
>
>     Good Luck!
>     Ken_S.
>
>_______________________________________________
>757labs_rov mailing list
>757labs_rov at 757labs.org
>http://757labs.org/cgi-bin/mailman/listinfo/757labs_rov
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ROV_MD Initializing...
	Opening ROV_MD.gif...
Starting...
	FR26831,TM8569,
	dRefFreq set to26831.0
	FR26770,TM8576,
	FR26855,TM8579,
	FR26779,TM8580,
	FR26746,TM8572,
	FR26779,TM8573,
	FR26728,TM8564,
	FR26724,TM8582,
	FR26815,TM8580,
	FR26780,TM8567,
	FR26761,TM8575,
	FR26737,TM8580,
	FR26807,TM8577,
	FR26860,TM8571,
	FR26736,TM8588,
	FR26716,TM8582,
	FR26773,TM8671,
	FR26738,TM8766,
	FR26732,TM8851,
	FR26757,TM8930,
	FR26739,TM9007,
	FR26712,TM9077,
	FR26754,TM9142,
	FR26759,TM9188,
	FR26774,TM9246,
	FR26767,TM9291,
	FR26790,TM9327,
	FR26802,TM9379,
	FR26738,TM9419,
	FR26724,TM9445,
	FR26760,TM9476,
	FR26721,TM9510,
	TM9539,
	FR26738,TM9567,
	FR26764,TM9577,
	FR26743,TM9610,
	FR26744,TM9638,
	FR26631,TM9659,
	FR26627,TM9671,
	FR26483,TM9695,
	FR26518,TM9693,
	FR26480,TM9679,
	FR26483,TM9646,
	FR26466,TM9623,
	FR26471,TM9585,
	FR26457,TM9553,
	FR27273,TM9532,
	FR28076,TM9482,
	FR28157,TM9464,
	FR28133,TM9433,
	FR28211,TM9397,
	FR28173,TM9372,
	FR28197,TM9343,
	FR28240,TM9324,
	FR28278,TM9313,
	FR28231,TM9277,
	FR28261,TM9232,
	FR28167,TM9224,
	FR28154,TM9227,
	FR28258,TM9200,
	FR28209,TM9166,
	FR28251,TM9143,
	FR28276,TM9142,
	FR28177,TM9123,
	FR28128,TM9101,
	FR28154,TM9088,
	FR28222,TM9069,
	FR28193,TM9054,
	FR28187,
	FR28152,TM9041,
	FR28174,TM9016,
	FR28258,TM9008,
	FR28153,TM8993,
	FR28188,TM8988,
	FR28165,TM8982,
	FR28210,TM8966,
	FR27685,TM8950,
	FR26491,TM8947,
	FR26478,TM8929,
	FR26516,TM8928,
	FR26536,TM8918,
	FR26511,TM8902,
ReZeroing Metal Detector...
	FR26492,TM8889,
	dRefFreq set to26492.0
	FR26495,TM8883,
	FR26510,TM8874,
	FR26491,TM8872,
	FR26469,TM8859,
	FR26513,TM8861,
	FR26444,TM8838,
	FR26527,TM8839,
	FR26537,TM8838,
	FR26482,TM8824,
	FR26488,TM8818,
	FR26489,TM8816,
	FR26514,TM8813,
	FR26511,TM8806,
	FR26517,TM8798,
	FR26460,TM8801,
	FR26519,TM8799,
	FR26501,TM8787,
	FR26531,TM8792,
	TM8781,
	FR26479,TM8782,
	FR26504,TM8776,
	FR26482,TM8767,
	FR26475,
	FR26512,TM8761,
	FR26427,TM8757,
	FR26498,TM8749,
	FR26508,TM8751,
Exiting...