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

Libraries

Install the libraries from this file - RTC_LCD_DHT.zip

DS3232 Real-time Clock

Open

• 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

Open

• 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