DFRobot DFR0274 Schnellstart-Handbuch - Seite 8

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while(pulseIn(IR_PIN, HIGH) < BIT_START);

read_pulse(pulse);

pulse_to_bits(pulse, bits);

RemoteVerify(bits);

return bits_to_int(bits);

}

use pulseIn to receive IR pulses from the remote.

Record the length of these pulses (in ms) in an array

void read_pulse(int pulse[])

{

for (int i = 0; i < IR_BIT_LENGTH; i++)

{

pulse[i] = pulseIn(IR_PIN, HIGH);

}

IR pulses encode binary "0" as a short pulse, and binary "1"

as a long pulse.

convert this to an array containing binary values

void pulse_to_bits(int pulse[], int bits[])

{

if (debug) { Serial.println("-----"); }

for(int i = 0; i < IR_BIT_LENGTH; i++)

{

if (debug) { Serial.println(pulse[i]); }

if(pulse[i] > BIT_1) //is it a 1?

{

bits[i] = 1;

}

else if(pulse[i] > BIT_0) //is it a 0?

{

bits[i] = 0;

}

else //data is invalid...

{

Serial.println("Error");

}

check returns proper first 14 check bits

void RemoteVerify(int bits[])

{

int result = 0;

int seed = 1;

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Given an array containing pulse lengths,