Synth-DIY Yahoo! Groups Archives

ADC Questions ???

2004-01-03 by Zheng Anding

Hi All,

I got 2 ADC questions,

1. I start ADC at the beginning of the Main(). In ADC ISR, after one time conversion, I start next one. But it's too fast for me. The data shown is too fast to display. How to slow down it?

2. There are data shown around 0 - 20 on the channels which even dont have sensor connected. It's like a "floating" data. How to get rid of it?

Highly appreciate for your answers!

Sincerely,

Alex

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RE: [AVR-Chat] ADC Questions ???

2004-01-03 by Larry Barello

1. Don't print so often, or, make the ADC clock really slow, or don't use interrupts and just do conversions in your main() routine with a suitable delay between conversions & printing.

2. Enable the internal pull-up to make the unused ports to read 0x3FF, or make them outputs and drive low to make them read 0x00. Or, better yet, ignore them.

The reason un-connected bits read similar to the previous conversion is that the sample & hold capacitor is not charged/discharged to the new voltage. They are indeed floating!

-----Original Message-----
From: Zheng Anding [mailto:adzheng@yahoo.com]
Sent: Saturday, January 03, 2004 1:15 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] ADC Questions ???

Hi All,

I got 2 ADC questions,

1. I start ADC at the beginning of the Main(). In ADC ISR, after one time conversion, I start next one. But it's too fast for me. The data shown is too fast to display. How to slow down it?

2. There are data shown around 0 - 20 on the channels which even dont have sensor connected. It's like a "floating" data. How to get rid of it?

Highly appreciate for your answers!

Sincerely,

Alex

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[AVR-Chat] LEADER BRAND OSCILLOSCOPE (MODEL: LS 81060

2004-01-04 by techy fellow

Hi,

I bought a used one at about USD 139.00. Not sure whether it is a good bargain. Doesn't comes with probes and user guide.

Anyhow, can someone please let me know where can I doenload a copy of the user manual ? I checked LeaderUSA's website, there seems to be none available. Thanks in advance for the help.

cheers,

Davis

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