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June 2007 Archives

June 13, 2007

Tech support: Pulse phone dialling

Andrew wrote:

I'm interested in using the CC16 to control a small automatic switchboard (PAX) for the old decadic dial type telephones. This would be used as a demonstration unit for a collection of old phones.

Could one of the inputs count a variable number of pulses (i.e. 1 to 10) at a rate of 10 pulses per second for a second and then have the program store the count as the digit dialled?

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Phishing: DON'T CLICK THAT LINK!

Phishers go round the world to hook Aussie victims, a must-read cautionary article on CNet. If you don't know the person who sent you the email, don't click the link.

June 18, 2007

Tech Support: Servo pulses

Nathan wrote:

Hello, For a device I am developing I need to be able to output a PWM signal (for servo control) in fractions between 1 and 2 mS. I have seen that there is a command which can output a signal in whole units of mSecs, but is there a way to break it down into finer incremements?

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June 23, 2007

Tech support: Motor positioning

Richard wrote (edited for confidentiality):

Hello David; I have a problem that I have been wrestling with for a week or more and now need some help with it.

I have a geared AC motor which I turn on with a 24V relay. When it is in its target position a PEC turns on, turns off the relay and the motor stops. But the motor free-wheels long enough that the mechanism overshoots the position where it should stop. No problem! I just reverse the motor, wait for the PEC to turn on again, turn off the motor but it overshoots in the other direction. No Problem. I just turn it on, pause (say 50 mS), then off (50 mS) while waiting for the PEC to turn on again. In other words, use short pulses to pulse it back into position to prevent overshooting. But here's the problem:

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About June 2007

This page contains all entries posted to In Control in June 2007. They are listed from oldest to newest.

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