In this instructable I’m going to show you how to do just that. All you need is an Arduino, an LCD screen and a Bluetooth module to make this and a Android mobile to upload your note wireless. I tried to keep it as small as possible and it is powered by a 9V battery.
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So enjoy building your own project.
So lets start with getting all the parts.
Parts List:
- LCD Module 16×2
- Arduino (I built my own)
- Bluetooth Module
- L805 Voltage Regulator
- 9V Battery
Tools:
- Soldering iron
Step 1: Arduino
Links
How to make a Arduino
Serial programmer
Step 2: LCD
Solder connector pins to the LCD and the same type connectors on the Arduino, so that you can easily plug them together. If you noticed that I had to change from the connectors in the previous step to this step a silly mistake that I made. You don’t have to connect all of the 16 pins just the ones in the circuit will do.
Step 3: Circuit
1)Complete the circuit connections
2)Upload “Hello World” code as in the IDE examples
3)Power the circuit and adjust the rheostat till you get a proper contrast.
4)Once you have the proper level, remove the rheostat and measure the value of resistance with respect to ground and LCD pin 3.
5)Replace the rheostat with the measured value of resistance.
Step 4: Bluetooth
Once you have the “Hello World” successfully working on your board. Now its time to connect it to your Android phone. To connect it you need to attach a Bluetooth module I got mine from eBay, but I had to make certain connections to the board to get it function as required, I’ll set up an instructable on how to do that soon. You can go for Bluesmirf if you don’t want to make any changes.
Step 5: Code
#include
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
// initialize the serial communications:
Serial.begin(9600);
}
void loop()
{
// when characters arrive over the serial port…
if (Serial.available()) {
// wait a bit for the entire message to arrive
delay(100);
// clear the screen
lcd.clear();
// read all the available characters
while (Serial.available() > 0) {
// display each character to the LCD
lcd.write(Serial.read());}}}
Step 6: Voltage Divider
To create it just follow the circuit and try to keep it as small as possible.
Step 7: Wood
Once you have completed setting up everything now you need a wood to which you need to glue it on. I did not use wood but some kind of a cardboard, I have no idea what they call it if you know leave a comment. The material I used is lighter and slimmer than wood.
For more detail: Arduino Fridge Magnet
