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???
02/20/10 16:14
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#173367 - need some helps
Responding to: ???'s previous message

i have 6 wires from the controller of a RF car

let's named them wire A B C D E F

wire A B C are for forward and reverse
wire D E F are for left and right

when wire A connected with C, the car move forward
when wire B connected with C, the car move reversed




yes, i want to drive the transistor into saturation when the pin is turn on

so can i use the circuit shown in the picture with some modification?

the chip i use is Atmel 89S8253 and the port is 2

here is the chip datasheet:
http://www.atmel.com/dyn/resou...oc3286.pdf

i will change the BC547 to 2N3904 transistor

case 1
the pin 1 of the transistor connected to wire A
the pin 3 of the transistor connected to wire C
the pin 2 of the transistor connected to port2 pin0

case 2
the pin 1 of the transistor connected to wire B
the pin 3 of the transistor connected to wire C
the pin 2 of the transistor connected to port2 pin1



Mathew

List of 16 messages in thread
TopicAuthorDate
Question on asm code            01/01/70 00:00      
   2 things            01/01/70 00:00      
   some change            01/01/70 00:00      
      even simpler            01/01/70 00:00      
         thanks for the simplified            01/01/70 00:00      
            yes, and even simpler            01/01/70 00:00      
               code and comments            01/01/70 00:00      
                  ;; ??            01/01/70 00:00      
                     thanks for the explanation            01/01/70 00:00      
   Short?            01/01/70 00:00      
      need some helps            01/01/70 00:00      
         Your circuit should work            01/01/70 00:00      
            Getting Rid Of Power On Relay Energize            01/01/70 00:00      
               Thank You All            01/01/70 00:00      
   document what happens to ACC.            01/01/70 00:00      
      noticed and questions            01/01/70 00:00      

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