Overview

• Name : clock_number_1
• Title : Arduino Real Time Clock with Alarm and environmental sensors
• Description : Arduino Clock, Features: RTC with battery (real time clock), Time, Date, Alarm, Temperature, Humidity, Pressure, LCD output, Keypad input, Sleep modes, LED LCD lighting (4X) white with dimmer control.
• Author: Gavin Lyons

Libraries Used

Name	Function	Version	Link
Keypad.h	keypad	3.1.1	URL
SFE_BMP180.h	BMP180 sensor	n/a	URL
LCD5110_Graph.h	LCD 5110	2.13	URL
dht.h	DHT11 sensor	0.1.0	URL
DS1307RTC.h	RTC	1.4.1	URL
Sleep_n0m1.h	Sleep mode	1.1.0	URL

Parts List

See eagle schematic in "doc" folder.

You will need following parts

Nokia 5110 LCD module

Arduino UNO rev 3 or NANO

Keypad 4x3 (note: I use 4x4 but leave last column unconnected so its a 4x3 in effect)

DS 1307 Real Time Clock module (with battery)

7 X 10K , 1 X 10ohm , 1 X 220ohm resistors

LM35 temperature sensor

BMP180 pressure sensor module

DHT11 humidity Sensor module

one 10K potentiometer

one active buzzer (alarm)

Current Consumption:

1. 40mA, Unit On with LEDs on Nokia LCD set to max.
2. 26mA, Unit On with LEDs on Nokia LCD set to min.
3. 24mA, Above with Nokia LCD sleep mode On.
4. 15mA, Above with Atmega328p (Unit) Sleep mode On.

Schematic

Keypad function

• 1, LM35 sensor data
• 2, DHT11 sensor data
• 3, BMP180 sensor data
• 4, Alarm Show
• 5, Alarm Set
• 6, Buzzer Test
• 7, Display keypad Help information
• 8, LCD screen Sleep mode on/off
• 9, Set date and time
• 0, Unit Sleep mode, wakes at Alarm.
• Asterisk, Alarm Stop
• Hash, LCD screen reset ( In event of LCD problem)