Created
October 30, 2012 23:57
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/* Rotary encoder read example */ | |
/* Verified as working on Arduino Uno */ | |
// connect ENCA pin to Uno pin 8 | |
#define ENC_A 8 | |
// connect ENCA pin to Uno pin 9 | |
#define ENC_B 9 | |
#define ENC_PORT PINB | |
void setup() | |
{ | |
/* Setup encoder pins as inputs */ | |
pinMode(ENC_A, INPUT); | |
digitalWrite(ENC_A, HIGH); | |
pinMode(ENC_B, INPUT); | |
digitalWrite(ENC_B, HIGH); | |
Serial.begin (115200); | |
Serial.println("Start"); | |
} | |
void loop() | |
{ | |
static uint8_t counter = 0; //this variable will be changed by encoder input | |
int8_t tmpdata; | |
/**/ | |
tmpdata = read_encoder(); | |
if( tmpdata ) { | |
Serial.print("Counter value: "); | |
Serial.println(counter, DEC); | |
counter += tmpdata; | |
} | |
} | |
/* returns change in encoder state (-1,0,1) */ | |
int8_t read_encoder() | |
{ | |
static int8_t enc_states[] = {0,-1,1,0,1,0,0,-1,-1,0,0,1,0,1,-1,0}; | |
static uint8_t old_AB = 0; | |
/**/ | |
old_AB <<= 2; //remember previous state | |
old_AB |= ( ENC_PORT & 0x03 ); //add current state | |
return ( enc_states[( old_AB & 0x0f )]); | |
} |
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