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/* DHT11 Module library V1.0 2017 Copyright (c) Adeept Technology Inc. All right reserved. Author: TOM */ #include "DHT11.h" // Return values: // DHTLIB_OK // DHTLIB_ERROR_CHECKSUM // DHTLIB_ERROR_TIMEOUT int DHT11::read(int pin) { // BUFFER TO RECEIVE uint8_t bits[5]; uint8_t cnt = 7; uint8_t idx = 0; // EMPTY BUFFER for (int i=0; i< 5; i++) bits[i] = 0; // REQUEST SAMPLE pinMode(pin, OUTPUT); digitalWrite(pin, LOW); delay(18); digitalWrite(pin, HIGH); delayMicroseconds(40); pinMode(pin, INPUT); // ACKNOWLEDGE or TIMEOUT unsigned int loopCnt = 10000; while(digitalRead(pin) == LOW) if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT; loopCnt = 10000; while(digitalRead(pin) == HIGH) if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT; // READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT for (int i=0; i<40; i++) { loopCnt = 10000; while(digitalRead(pin) == LOW) if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT; unsigned long t = micros(); loopCnt = 10000; while(digitalRead(pin) == HIGH) if (loopCnt-- == 0) return DHTLIB_ERROR_TIMEOUT; if ((micros() - t) > 40) bits[idx] |= (1 << cnt); if (cnt == 0) // next byte? { cnt = 7; // restart at MSB idx++; // next byte! } else cnt--; } // WRITE TO RIGHT VARS // as bits[1] and bits[3] are allways zero they are omitted in formulas. humidity = bits[0]; temperature = bits[2]; uint8_t sum = bits[0] + bits[2]; if (bits[4] != sum) return DHTLIB_ERROR_CHECKSUM; return DHTLIB_OK; }