Tim's Arduino Games

A Little Race game for the Arduino

on a Nokia LCD Screen via I2C Module.

I have created a HEX file of this game Tims_Racer.zip

Inside the zip the are versions for the UNO and NANO, with or without the bootloader (old bootloader for Nano)

Also there is a copy of XLoader to upload the HEX to the Arduino.

It needs the same setup as Brick a Bottle or Three.

The pins for the buttons on the Arduino are as follows.

A0 = Button 1
A1 = Button 2
A2 = Button 3
A3 = Button 4
D8 = Button LED
D9 = Piezo

Remember the Arduino is has 5 volt data and the Nokia Screen is 3.3 volt.

Power going to the PCF8574 should only be 3.3 volt.

I have since added 10k resistors in line to the data leads connected to the Nokia screen.

Use at your own risk.

A little game to show how to use a PCF8574 with a Nokia 5110 screen.

Components:

Arduino

Breadboard (and leads)

Nokia 5110 Screen

PCF8574
I2C Serial Interface Board Module for 1602LCD Display (PCF8574)
PCF8574 Module

Piezo (for sound)
A bit of corrugated card board to amplify the sound made by the piezo.

4 x Push on Buttons

Battery

Data for PCF8574 (Remote 8-bit I/O expander for I2C-bus with interrupt)

Data for PCD8544 (48 × 84 pixels matrix LCD controller/driver)

In this project I am using the module designed for 0216 LCD diplay.

There are several reasons for using this module.
The first time I bought a Nokia 5110 screed the advert say it was 5v compatible (I fried it), no it isn't, it's 3.3 volt.
This can be sorted using resistors as voltage dividers, or MOSFET circuits.
The Nokia 5110 screen also communicates via SPI requiring 4 communication lines and power.
If we use the Module:
The PCF8574 requires only 2 communication lines and power.
Also the module has a transistor connected to PFC8574 GPIO pin 3, which connects Header Pin 16 to GND. (Used for switching the LED).
If the module is powered by 3.3 volt, it will communicate with 3.3 volt to the Nokia 5110 screen and still be able handle the I2C communication from the Arduino.

The circuit of the Module:

Connections:

I2C Serial Interface Board Module for 1602LCD Display
Module 4 pin header	Arduino
GND	GND
VCC	3.3v
SDA	A4
SCL	A5

Module 16 pin header	Nokia Screen
Pin 01	Pin 8 Nokia 5110 Screen
Pin 02	Pin 6 Nokia 5110 Screen
Pin 03	NC
Pin 04	NC (free GPIO_0)
Pin 05	NC (free GPIO_1)
Pin 06	Pin 1 Nokia 5110 Screen
Pin 07	NC
Pin 08	NC
Pin 09	NC
Pin 10	NC
Pin 11	Pin 2 Nokia 5110 Screen
Pin 12	Pin 3 Nokia 5110 Screen
Pin 13	Pin 4 Nokia 5110 Screen
Pin 14	Pin 5 Nokia 5110 Screen
Pin 15	NC
Pin 16	Pin 7 Nokia 5110 Screen

Buttons
Header Pin	Arduino
1 (Button 1)	A0
2 (Button 2)	A1
3 (Button 3)	A2
4 (Button 4)	D7
5 (common pin)	GND

Piezo Sounder
Connection	Arduino
Does not matter	GND
	D11

The code:

Tims_Brick_a_Bottle_or_Three.

Credit for the library <PCF8574_PCD8544.h> used in the code goes to: Maxint R&D

The library is used like most display libraries.

It is defined like: PCF8574_PCD8544 display = PCF8574_PCD8544(0x27, 7, 6, 5, 4, 2);

It also uses <Adafruit_GFX.h> library (credit to: Limor Fried/Ladyada) so the commands to draw graphics, is as the Adafruit GFX library.

In setup:

I have made pins A0, A1 and A2 raise an interrupt when button 1, 2 or 3 is pressed.

PCICR = 0b00000010; // Pin Change Interrupt Enable.

PCMSK1 = 0b00000111; // Enable Pin Change Interrupt for A0, A1, A2.
sei(); //enable interrupts.

I have enabled pullup resistors on the button pins. The buttons close to GND.
(the button module has capacitors to help with bounce)

pinMode(BUTTON_1, INPUT_PULLUP);
pinMode(BUTTON_2, INPUT_PULLUP);
pinMode(BUTTON_3, INPUT_PULLUP);
pinMode(LED_ON, INPUT_PULLUP);

The function to receive the interrupts is ISR(PCINT1_vect){ //code goes here }

The images to draw the bottles are made from char Array.

Example:
//bottle 6x16
static const unsigned char PROGMEM bottle_img[] =
{ B00110000,
B00110000,
B00110000,
B00110000,
B01111000,
B11111100,
B11111100,
B11111100,
B11111100,
B11111100,
B11111100,
B11111100,
B11111100,
B11111100,
B01111000 };

Although the bottle is only 6 bits wide, the library only works with 8 bit values.

But when using the library command to draw the image, we still the value 6 for the width.

display.drawBitmap(positionX, positionX, bottle_img, 6, 15, 1);

The sound is produced using the tone function.
Gluing the piezo to the back of a piece of card amplifies the sound.