KY-015 DHT11 Digital Temperature & Humidity Sensor Module — 3-Pin PCB, Arduino

KY-015 DHT11 Digital Temperature & Humidity Sensor Module — 3-Pin PCB, Arduino

The KY-015 module integrates the DHT11 digital temperature and humidity sensor on a compact 3-pin PCB with an onboard pull-up resistor, making it plug-and-play for Arduino, ESP8266, ESP32, and Raspberry Pi projects. The DHT11 uses a single-wire serial protocol to deliver calibrated temperature (0–50°C, ±2°C) and relative humidity (20–90% RH, ±5%) readings, making it the most popular entry-level environmental sensor for weather stations, HVAC monitoring, and smart home projects.

Key Specifications

Parameter	Value
Sensor IC	DHT11
Interface	Single-wire serial (1-Wire-like, not standard 1-Wire)
Temperature Range	0°C – 50°C
Temperature Accuracy	±2°C
Humidity Range	20% – 90% RH
Humidity Accuracy	±5% RH
Sampling Rate	1 reading per second (max)
Supply Voltage	3.3V – 5V
Module Pins	3-pin (VCC, DATA, GND) — onboard pull-up resistor included
Operating Temperature	0°C to +50°C

DHT11 vs DHT22 — Which Should I Use?

Feature	DHT11 (KY-015)	DHT22 (AM2302)
Temperature Range	0–50°C	-40–80°C
Temperature Accuracy	±2°C	±0.5°C
Humidity Range	20–90% RH	0–100% RH
Humidity Accuracy	±5% RH	±2% RH
Sampling Rate	1 Hz	0.5 Hz (1 reading per 2 sec)
Price	Lower	Higher
Best For	Indoor room temperature/humidity, learning projects	Outdoor, freezer, high-accuracy applications

Why Choose KY-015 DHT11 Module?

• Onboard pull-up resistor — plug directly into MCU GPIO, no external components needed
• 3-pin interface — simpler than 4-pin bare DHT11 sensor (no floating NC pin)
• 3.3V–5V compatible — works with Arduino (5V) and ESP32/Raspberry Pi (3.3V)
• DHT library support — one of the most widely documented sensors in Arduino ecosystem
• Low cost — ideal for learning, weather station, and non-critical humidity monitoring

Compatible With

• Arduino: DHT sensor library by Adafruit — dht.readTemperature() and dht.readHumidity()
• ESP8266 / ESP32: Same Adafruit DHT library, 3.3V compatible
• Raspberry Pi: Adafruit CircuitPython DHT library or pigpio
• MicroPython: Built-in dht module — d = dht.DHT11(Pin(4)); d.measure()
• Home Assistant / ESPHome: dht platform for smart home temperature/humidity dashboard

Frequently Asked Questions

Q: How do I read DHT11 with Arduino?
A: Install the “DHT sensor library” by Adafruit in Arduino IDE. Connect DATA to any digital pin (e.g., D2). Use: DHT dht(2, DHT11); dht.begin(); float t = dht.readTemperature(); float h = dht.readHumidity(); Add a 2-second delay between readings — DHT11 updates only once per second.

Q: Why does my DHT11 return NaN or incorrect readings?
A: Common causes: (1) Reading too fast — add delay(2000) between readings. (2) Cable too long — keep DATA wire under 20cm; add 100nF capacitor between VCC and GND near the sensor for longer cables. (3) Wrong pin — verify DATA pin number in code matches physical connection. (4) Power issue — ensure stable 3.3V or 5V supply.

Q: Can DHT11 measure outdoor temperature and humidity?
A: DHT11 is rated 0–50°C and 20–90% RH, so it cannot measure below freezing or above 90% humidity. For outdoor use with frost, rain, or high humidity, use DHT22 (AM2302) which covers -40–80°C and 0–100% RH with better accuracy.

Package Contents

• 1× KY-015 DHT11 Digital Temperature & Humidity Sensor Module (3-pin PCB)

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