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hardware:arduino [2015/03/04 17:53]
admin [Rotary encoders] 		hardware:arduino [2015/03/04 18:07] (current)
admin [Rotary encoders]
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   * direct attach to two (2) interrupt pins, keyword: passive waiting   * direct attach to two (2) interrupt pins, keyword: passive waiting
   * using external IO with counter, keyword: any time baby, any time :)   * using external IO with counter, keyword: any time baby, any time :)
 +
 +Huge note: dont forget 10k pull up resistors.
  
 ad 1) ad 1)
Line 58: Line 60:
  
 ad 2) Using interrupts to read a rotary encoder is a perfect job for interrupts because the interrupt service routine (a function) can be short and quick, because it doesn'​t need to do much.  ad 2) Using interrupts to read a rotary encoder is a perfect job for interrupts because the interrupt service routine (a function) can be short and quick, because it doesn'​t need to do much. 
- 
-**HUGE NOTE: pull up resistors** 
  
 <​code>​ <​code>​
-#​define ​encoder0PinA ​ 2 +#​define ​encoderPinA ​ 2 
-#​define ​encoder0PinB ​ 4+#​define ​encoderPinB ​ 4
  
-volatile ​unsigned ​int encoder0Pos ​= 0;+volatile int encoderPos ​= 0;
  
 void setup() { void setup() {
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 MyInterrupt() { MyInterrupt() {
-if (digitalRead(encoder0PinA) == digitalRead(encoder0PinB)) {+if (digitalRead(encoderPinA) == digitalRead(encoderPinB)) {
     encoderPos++;​     encoderPos++;​
   } else {   } else {
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 </​code>​ </​code>​
  
-You can print the value outside the MyIntterupt() routine, which should be as fast&​small as possible.+You can print the value **outside** not inside ​the MyIntterupt() routine, which should be as fast&​small as possible.
 <​code>​ <​code>​
 void loop() { void loop() {
 
hardware/arduino.1425487995.txt.gz · Last modified: 2015/03/04 17:53 by admin