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Author Topic: cnc screwcutting???  (Read 18540 times)

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Offline Tweakie.CNC

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Re: cnc screwcutting???
« Reply #10 on: January 18, 2011, 11:32:34 AM »
Dale,

Check the output from your charger, some phone chargers don't put out anything until connected to a load such as a flat battery.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: cnc screwcutting???
« Reply #11 on: January 18, 2011, 12:40:39 PM »
i've used one of these before, and they work well.

http://cncdoctor.co.uk/index-pulse_62.html
Re: cnc screwcutting???
« Reply #12 on: January 18, 2011, 06:40:30 PM »
Hi all, thanks for the reply,

I have checked there is 5v coming from the power supply, I also remembered to add the 220k resistor. I have rechecked the data sheet Manufacturers Part No. OPB916B

  ( http://uk.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=455-0896+ )

 from RS website and from reading hoods description I think I can make a little sense of the circuit. 5v power goes to power the led and the sensor with a resistor across the sensor 5v input and the output wire. if that's make any sense to anybody. if only i could upload an image. It's late now here in the UK. I'll try again tomorrow with the resistor across the white and blue wires.

P.S. thanks for posting the link for cncdoctor, if I can't get this circuit to work I'll purchase one from them.

Offline Hood

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Re: cnc screwcutting???
« Reply #13 on: January 18, 2011, 07:11:31 PM »
See attached pic, if you didnt have the resistor in line with the red you may have blown the LED.

Hood
Re: cnc screwcutting???
« Reply #14 on: January 19, 2011, 04:23:19 AM »
Hi hood,

I've upoaded a photo of my test set up, this is how I,ve had it set up from the start. Is it correct?

Regards

Dale gribble
Re: cnc screwcutting???
« Reply #15 on: January 19, 2011, 05:02:28 AM »
I have checked there is 5v coming from the power supply, I also remembered to add the 220k resistor.

Ah ... better check the specs again. I think that resistor is the current limit for the LED, and it should be 220 ohms, not 220 kilohms.

Cheers
Re: cnc screwcutting???
« Reply #16 on: January 19, 2011, 07:14:42 AM »
Bingo it work's, I didn't have a 220 ohm nearest i had was a 250 ohm and it worked perfect.

Thanks rcaffin and everybody that contributed.

Regards

Dale Gribble ;D
Re: cnc screwcutting???
« Reply #17 on: January 22, 2011, 07:02:20 AM »
Hi, I'm back for some help, I've got the sensor mounted and can see with my meter 0 to 5v when i manually turn my spindle. The problem is when I connect it to my BOB pin 10 the volts drop to 1.1v to 0. Not enough for a high signal. I've taken power from the 5v pin next to pin 10 on my BOB. Do I need to power this with it's own supply. I've added an image of the sensor and my BOB. Any information would be gratefully received.

Regards

Dale gribble

Offline Tweakie.CNC

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Re: cnc screwcutting???
« Reply #18 on: January 22, 2011, 07:16:59 AM »
Dale,

Try setting the 'pull up / pull down' jumper for pin 10 (input configuration) to the opposite of what it currently is.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: cnc screwcutting???
« Reply #19 on: January 22, 2011, 09:03:22 AM »
Hi, I tried in mach input setting, active hi and low. it made no difference. If you are referring to the BOB the model i have only has built in pull down resistors. I since add a separate supply and this seems to work I can see a clean 5v - 0v on my meter. problem now is i seem to have blown my BOB with all this messing around. Just another in joyable day in the life of owning a cnc.

Thanks

Dale gribble