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Author Topic: Help using two sharps  (Read 1223 times)

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Offline HenriqueTopic starter

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Help using two sharps
« on: November 03, 2010, 11:37:46 AM »
How can I put 2 sharps in the axon ? I have a trouble to boot the program in axon. The error must not be in the program because the boot never happens succesfully when two sharps were connected there. I have connected in the ports I/O analog 4 and 5

Offline knossos

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Re: Help using two sharps
« Reply #1 on: November 03, 2010, 12:05:39 PM »
I assume you mean the boot loader?  Are you using FBOOT or another method to load the program to the Axon?  If you had a previous program that was working can you reload that one successfully?  Do you have other devices connected, if so which ones?
"Never regret thy fall,
O Icarus of the fearless flight
For the greatest tragedy of them all
Is never to feel the burning light."
 
Oscar Wilde

Offline waltr

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Re: Help using two sharps
« Reply #2 on: November 03, 2010, 01:47:16 PM »
I'll guess at the problem.
The Sharp IR sensors pull a large amount of current when they pulse their internal LED and the voltage to the processor dips enough to reset the processor. Even with only one Sharp sensor I and others have had processor problems. The common cure is to install a separate 5 Volt regulator (LM7805 or equivalent) to power the Sharp sensors. Another help is to add a low ESR cap of 10 to 25uF directly on the Sharps PCB.

Also do a search in this forum for more info and discussion of this issue.

Offline HenriqueTopic starter

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Re: Help using two sharps
« Reply #3 on: November 03, 2010, 03:56:46 PM »
I assume you mean the boot loader?  Are you using FBOOT or another method to load the program to the Axon?  If you had a previous program that was working can you reload that one successfully?  Do you have other devices connected, if so which ones?

Yes the boot loader and Im using FBOOT. I have 2 LDR's , and a L298 connected in axon.

I'll guess at the problem.
The Sharp IR sensors pull a large amount of current when they pulse their internal LED and the voltage to the processor dips enough to reset the processor. Even with only one Sharp sensor I and others have had processor problems. The common cure is to install a separate 5 Volt regulator (LM7805 or equivalent) to power the Sharp sensors. Another help is to add a low ESR cap of 10 to 25uF directly on the Sharps PCB.

Also do a search in this forum for more info and discussion of this issue.

I will try this ! but there isn't another easiest way ?
thanks.
« Last Edit: November 03, 2010, 08:39:16 PM by Henrique »

 


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