Arduino Knock! Knock!

###You knock! Your Arduino answer!!!

This is the simple Arduino program that detect knock and display the Hello World text to Nokia 5110 LCD.

Watch demo here:

##Libraries:

1. Adafruit GFX Library (get it here)
2. Adafruit PCD8544 Library (get it here)

##Components:

1. Aduino UNO
2. Nokia 5110 LCD (find it here)
3. KEYES Knock Module (find it here)
4. Jump Wire
5. Breadboard (optional)

##Wiring

1. The knock module:

For wiring the knock module, looking for the minus - icon (because some knock module has the different layout), this must be connected with the GND pin, connect it to Arduino follow this:

• Minus --- GND
• VCC --- VCC (5V)
• Output --- Pin 2

Then, you can find some where to hide your knock module, for me, I put it inside my wood cover notebook, for easier knock.

2. The Nokia LCD:

Following Adafruit's guide to wiring the Nokia LCD (Software SPI, if you want to make the display faster, use Hardware SPI). In this tutorial, I use Arduino UNO, this must be different if you're using another kind of Arduino (Leonardo, MEGA,...)

• CLK --- Pin 7
• DIN --- Pin 6
• D/C --- Pin 5
• CS --- Pin 4
• RST --- Pin 3

##Coding

See the attached source code in this repo.

##Testing

Knock twice and you will see the Nokia LCD turned on, the text: "Hello World!" displayed! Wait 2 seconds, the display turned off.