This video show how to build a humidity meter using a DHT11 humidity sensor, I2C OLED display and Arduino Uno.
A 128X64 I2C Oled ssd1306 display is used to display the humidity, temperature and heat Index.
I used an Arduino UNO 3.3V clone which uses Atmega328P. DHT11 humidity sensors are cheap and easily available on Ebay, Bangood, Sparkfun etc.
DHT22 humidity sensor can be used in place of DHT11 for more accuracy.
Library used U8Glib: Installed directly from the Library Manager in Arduino IDE.
Connect the humidity sensor pin 2 to D2 pin of Arduino. Also connect an 10K resistor between D2 and 3.3V pin of Arduino. The OLED display VCC is connected to 3.3V of Arduino. GND to GND of Arduino. SDA of OLED to SDA or Arduino, SCL of OLED to SCL of Arduino.
Humidity Meter code: Download/copy in the box below and save with .ino extension.