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???
02/25/03 17:10
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 		 #40041 - RE: Connecting an LED to an 8052
Responding to: ???'s previous message
2nd Method 0 is ON 1 is OFF - the simple off at reset.

3rd method, a one to port turns on the LED, reset leaves the lights ON.

I also like base resistors to limit current to the base drive.

In 2.) You want PNP transistor, Emitter to the + supply , base (via resistor) to the port, collector to the LED anode, resistor from the cathode to the 0V rail. Otherwise the Base-emitter sees the drop across the load as well, and you haven't got the voltage swing on the input to saturate the transistor.

Steve

List of 40 messages in thread
TopicAuthorDate
Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
      RE: Connecting an LED to an 8052            01/01/70 00:00      
      Figure #2 like this?            01/01/70 00:00      
         RE: Figure #2 like this?            01/01/70 00:00      
            RE: Figure #2 like this?            01/01/70 00:00      
               RE: Figure #2 like this?            01/01/70 00:00      
                  RE: Figure #2 like this?            01/01/70 00:00      
                     RE: Figure #2 like this? Rob            01/01/70 00:00      
                        RE: Figure #2 like this? Rob            01/01/70 00:00      
                  RE: Figure #2 like this?            01/01/70 00:00      
                     RE: drawing            01/01/70 00:00      
                        RE: drawing            01/01/70 00:00      
                           RE: drawing            01/01/70 00:00      
                              RE: drawing            01/01/70 00:00      
               Jackson Pollock?            01/01/70 00:00      
                  RE: Jackson Pollock?            01/01/70 00:00      
                     RE: Perpetual Energy / Chris            01/01/70 00:00      
                        RE: Perpetual Energy / Chris            01/01/70 00:00      
            RE: Figure #2 like this? Steve            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
      RE: Connecting an LED to an 8052            01/01/70 00:00      
         RE: Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
      RE: Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
      RE: Connecting an LED to an 8052            01/01/70 00:00      
         RE: Connecting an LED to an 8052            01/01/70 00:00      
            RE: Connecting an LED to an 8052            01/01/70 00:00      
               RE: Connecting an LED to an 8052            01/01/70 00:00      
               RE: Connecting an LED to an 8052            01/01/70 00:00      
                  RE: Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
   *** LED Page updated ***            01/01/70 00:00      
      RE: *** LED Page updated ***            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      
      RE: Connecting an LED to an 8052            01/01/70 00:00      
         RE: Connecting an LED to an 8052            01/01/70 00:00      
   RE: Connecting an LED to an 8052            01/01/70 00:00      

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