ESP8266 Ubidots - ESP8266 sketches using the Ubidots IOT library for Arduino

Sketches

Arduino IDE | Examples | DHT22 Temperature & Humidity:

• DHT22

Hardware

Pull-up resistor DAT pin

• Connect an external 3k3..10k pull-up resistor between the DAT and VCC pins only when:
  • Using a AM2302 sensor without a DT22 breakout PCB and the MCU IO pin has no built-in or external pull-up resistor.
• The DHT22 breakout PCB contains a 3k3 pull-up resistor between DAT and VCC.
• Please refer to the MCU datasheet or board schematic for more information about IO pin pull-up resistors.

External capacitor

• Tip: Connect a 100nF capacitor between the sensor pins VCC and GND when read errors occurs. This may stabilize the power supply.

Connection DHT22 - ESP8266

Some ESP8266 boards uses Arduino pin 2 -> GPIO4 which is D4 text on the board. Make sure you're using the right pin.

DHT22	ESP8266 / WeMos D1 R2 / ESP12E / NodeMCU
GND	GND
VCC	3.3V
DAT	D2

Other MCU's may work, but are not tested.

Documentation

• DHT22 datasheet

Library dependencies

• Esp
• ubidots-esp8266
• ErriezDHT22
• ErriezTimestamp

Special thanks to

• Erriez