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hardware:arduino [2015/03/04 17:53] admin [Rotary encoders] |
hardware:arduino [2015/03/04 17:57] admin [Rotary encoders] |
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| Line 19: | Line 19: | ||
| * 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() { | ||
| Line 72: | Line 72: | ||
| MyInterrupt() { | MyInterrupt() { | ||
| - | if (digitalRead(encoder0PinA) == digitalRead(encoder0PinB)) { | + | if (digitalRead(encoderPinA) == digitalRead(encoderPinB)) { |
| encoderPos++; | encoderPos++; | ||
| } else { | } else { | ||
hardware/arduino.txt · Last modified: 2015/03/04 18:07 by admin