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[DPRG] reading a Cds via Port E on a HC11

Subject: [DPRG] reading a Cds via Port E on a HC11
From: Ralph Tenny rten at metronet.com
Date: Sat Jun 23 12:40:41 CDT 2001

What is the voltage swing [from light on Cds (low voltage) to no light on
Cds (high voltage)} output from the Cds? If the high voltage exceeds 5
volts, not only must you use a resistor, the pin on Port E must have a
diode clamp to +5v to limit tthe voltage applied to port E:
			+5v
	                   |
			   -
			   ^
			   |
			   |			
	Cds-------\/\/\/\-------PortE
Ralph

On Sat, 23 Jun 2001, montgomery f.
tidwell wrote:

> Howdy,
> 
> i've created a line sensor using a LED/Cds combo. do i need to put
> a resistor in between the Cds and (a pin on) Port E?
> 
> 
> 
>                               \\//_
> 
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