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Real-time Clock, LCD Module, Humidity Sensor (Real Hardware)

Real-time Clock, LCD Module, Humidity Sensor (Real Hardware)

Owned by Rajesh Panicker (Unlicensed)
Last updated: 26 May 2024 by Rajesh Panicker
2 min read

Libraries

Install the libraries from this file - RTC_LCD_DHT.zip

DS3232 Real-time Clock

  • Maintains time even when Arduino is not powered

  • Used in computers to maintain time

  • Time can be set from the Arduino

  • Uses I2C protocol

  • 4 connections

  • SDA (Serial Data) – Connect to SDA pin of Arduino (2 pins away from pin 13)

  • SCL (Serial Clock) – Connect to SCL pin of Arduino (3 pins away from pin 13)

  • VCC – 5V of Arduino

  • GND – GND of Arduino

  • You can use the SetSerial program to set the time

  • Send 2019,10,19,16,10,00 from serial monitor to set the time to 4:10pm on 19/10/2019

I2C 16×2 Character LCD Module

  • 16x2 display with backlight

  • Contrast needs to be adjusted using a screw-driver

  • Uses I2C protocol

  • 4 connections

  • SDA – SDA pin of Arduino

  • SCL – SCL pin of Arduino

  • VCC – 5V of Arduino

  • GND – GND of Arduino

  • Some modules may use a different address – use the I2Scanner program can find out

  • Can be connected in parallel to the DS3232 RTC and be operated simultaneously (the two are distinguished by their addresses)



DHT 11 Humidity Sensor

  • Gives temperature and humidity readings

  • Uses a custom (non-standard) protocol

  • Data can be up to 2 seconds old

  • 3 connections

  • DATA – Serial Data. Connect to any digital pin of Arduino

  • The supplied program is meant to use pin 12

  • Change #define DHTPIN <pin_number> if using any other pin

  • VCC – 5V of Arduino

  • GND – GND of Arduino