Description
KY-015 Temperature & Humidity Sensor has excellent quality, fast response, anti-interference ability, low cost and other advantages. Single Wire serial interface that allows quick and easy system integration. Ultra-small size, low power consumption, signal transmission distance Up to 20 meters, making it to the class of applications and even the most demanding applications is the best choice.
KY-015 Temperature & Humidity Sensor Specifications
- Supply voltage: 3.3 ~ 5.5V DC
- Output: single-bus digital signal
- Measuring range: Humidity 20-90% RH, Temperature 0 ~ 50 ℃
- Accuracy: Humidity + -5% RH, temperature + -2 ℃
- Resolution: Humidity 1% RH, temperature 1 ℃
- Long-term stability: <± 1% RH / Year
Notes
- to avoid the use of the condensation conditions
- long-term storage temperature 10-40 ℃, humidity below 60%
- the use of power and ground connection to be correct, so as not to damage the sensor
Required Hardware Devices
- Arduino controller × 1
- USB data cable × 1
- DHT 11 module × 1
Connecting
- Arduino pin 8 –> Pin S module
- Arduino GND –> Pin – module
- Arduino +5 –> Pin Middle
Code
//KY015 DHT11 Temperature and humidity sensor int DHpin = 8; byte dat [5]; byte read_data () { byte data; for (int i = 0; i < 8; i ++) { if (digitalRead (DHpin) == LOW) { while (digitalRead (DHpin) == LOW); // wait for 50us delayMicroseconds (30); // determine the duration of the high level to determine the data is '0 'or '1' if (digitalRead (DHpin) == HIGH) data |= (1 << (7-i)); // high front and low in the post while (digitalRead (DHpin) == HIGH); // data '1 ', wait for the next one receiver } } return data; } void start_test () { digitalWrite (DHpin, LOW); // bus down, send start signal delay (30); // delay greater than 18ms, so DHT11 start signal can be detected digitalWrite (DHpin, HIGH); delayMicroseconds (40); // Wait for DHT11 response pinMode (DHpin, INPUT); while (digitalRead (DHpin) == HIGH); delayMicroseconds (80); // DHT11 response, pulled the bus 80us if (digitalRead (DHpin) == LOW); delayMicroseconds (80); // DHT11 80us after the bus pulled to start sending data for (int i = 0; i < 4; i ++) // receive temperature and humidity data, the parity bit is not considered dat[i] = read_data (); pinMode (DHpin, OUTPUT); digitalWrite (DHpin, HIGH); // send data once after releasing the bus, wait for the host to open the next Start signal } void setup () { Serial.begin (9600); pinMode (DHpin, OUTPUT); } void loop () { start_test (); Serial.print ("Current humdity ="); Serial.print (dat [0], DEC); // display the humidity-bit integer; Serial.print ('.'); Serial.print (dat [1], DEC); // display the humidity decimal places; Serial.println ('%'); Serial.print ("Current temperature ="); Serial.print (dat [2], DEC); // display the temperature of integer bits; Serial.print ('.'); Serial.print (dat [3], DEC); // display the temperature of decimal places; Serial.println ('C'); delay (700); }
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