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  Topic: USB camera to AV signal
levettp

Replies: 6
Views: 10605

PostForum: General CCS C Discussion   Posted: Tue Oct 04, 2011 1:05 am   Subject: USB camera to AV signal
Just some feedback that might help someone. This is quite a nifty product that is available:

http://www.gowiththeshark.com/RCV230_RC_aerial_video_wireless_camera_vision_system_headset.html
  Topic: USB camera to AV signal
levettp

Replies: 6
Views: 10605

PostForum: General CCS C Discussion   Posted: Mon Oct 03, 2011 5:00 am   Subject: USB camera to AV signal
Thanks for the advice
  Topic: USB camera to AV signal
levettp

Replies: 6
Views: 10605

PostForum: General CCS C Discussion   Posted: Sun Oct 02, 2011 9:00 am   Subject: USB camera to AV signal
99% of PIC's can't do this.
If fact I doubt if any can.
The USB device needs to connect to a USB _host_. There are a few PIC's with this ability the USB 'OTG' devices. However the device then needs ...
  Topic: USB camera to AV signal
levettp

Replies: 6
Views: 10605

PostForum: General CCS C Discussion   Posted: Sun Oct 02, 2011 1:16 am   Subject: USB camera to AV signal
I have a USB microscope and a set of these new virtual screen glasses. The microscope runs with the standard Windows drivers and the virtual screen has an AV input.

After a lengthy search I could ...
  Topic: PIC with external ADC
levettp

Replies: 3
Views: 5370

PostForum: General CCS C Discussion   Posted: Sun Aug 07, 2011 3:34 pm   Subject: PIC with external ADC
This dsPIC30F2020 has actually given me so many headaches i.t.o. instability when running at 30MIPS that I will definitely consider changing over to another PIC
  Topic: PIC with external ADC
levettp

Replies: 3
Views: 5370

PostForum: General CCS C Discussion   Posted: Sun Aug 07, 2011 1:04 pm   Subject: PIC with external ADC
As a member of this forum for many years I am aware that there are many highly skilled electronic engineers here.

I simply don't have the time for my latest PIC project so I registered a developmen ...
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Wed Dec 08, 2010 3:01 am   Subject: Over voltage protection
Interesting idea. Will give it a try.

Thank you for your advice!
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Tue Dec 07, 2010 1:34 am   Subject: Over voltage protection
"Why not clamp the spike, into a capacitor that is discharged while the coil is being energised" ... I am not sure what you mean by this. Is it similar to the first schematic on http://datas ...
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Fri Dec 03, 2010 1:57 am   Subject: Over voltage protection
@Ttelmah:

I use the Differential Diode Protection method as described in figure 4 - http://www.maxim-ic.com/app-notes/index.mvp/id/4035

R(limit)= 10MOhm
Diodes= 1N1418

I use 6 diodes in seri ...
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Thu Dec 02, 2010 7:14 am   Subject: Over voltage protection
Thanks a lot for the advice everyone ... I am really overwhelmed with all the ideas.

@Ttelmah: With regards to your point 4: I do clamp the back EMF of the coil. This voltage is actually what I am ...
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Wed Dec 01, 2010 5:07 pm   Subject: Over voltage protection
You don't say exactly what you are doing, but I would consider using a transformer to step the mains down to a lower voltage (also provides isolation). Mains (110 or 220) can kill you and you want to ...
  Topic: Over voltage protection
levettp

Replies: 15
Views: 15848

PostForum: General CCS C Discussion   Posted: Wed Dec 01, 2010 4:45 pm   Subject: Over voltage protection
I'm using a PIC to interface with a 220V power supply.

Something went wrong and 220V flew through the PIC, blew my PICkit programmer and laptop that were connected to the PIC via USB.

I used si ...
  Topic: FAST A/D CONVERSION
levettp

Replies: 9
Views: 14840

PostForum: General CCS C Discussion   Posted: Thu Nov 11, 2010 1:34 am   Subject: dsPIC30F2020
I got the sound card running but now I want to move to faster sampling.

dsPIC30F2020 can apparently do 2MS/s but I scanned this message board and it appears that 30F2020.h is either not properly co ...
  Topic: FAST A/D CONVERSION
levettp

Replies: 9
Views: 14840

PostForum: General CCS C Discussion   Posted: Sun Oct 24, 2010 9:22 am   Subject: FAST A/D CONVERSION
Thank you for everyones inputs.

I'm going the route of using a PC sound card for A/D conversion.
  Topic: FAST A/D CONVERSION
levettp

Replies: 9
Views: 14840

PostForum: General CCS C Discussion   Posted: Sat Oct 23, 2010 4:48 am   Subject: FAST A/D CONVERSION
Thank you bkamen and Ttelmah.

@Ttelmah: I need at least 3 readings during the 30 micro seconds sampling period. Further, 8 bit resolution will unfortunately not be adequate accuracy.

It appears ...
 
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