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37 lines
1.6 KiB
C++
37 lines
1.6 KiB
C++
/* ATtiny85 as an I2C Master Ex2 BroHogan 1/21/11
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* Modified for Digistump - Digispark LCD Shield by Erik Kettenburg 11/2012
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* SETUP:
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* ATtiny Pin 1 = (RESET) N/U ATtiny Pin 2 = (D3) N/U
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* ATtiny Pin 3 = (D4) to LED1 ATtiny Pin 4 = GND
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* ATtiny Pin 5 = SDA on DS1621 & GPIO ATtiny Pin 6 = (D1) to LED2
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* ATtiny Pin 7 = SCK on DS1621 & GPIO ATtiny Pin 8 = VCC (2.7-5.5V)
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* NOTE! - It's very important to use pullups on the SDA & SCL lines!
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* PCA8574A GPIO was used wired per instructions in "info" folder in the LiquidCrystal_I2C lib.
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* This ex assumes A0-A2 are set HIGH for an addeess of 0x3F
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* LiquidCrystal_I2C lib was modified for ATtiny - on Playground with TinyWireM lib.
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* TinyWireM USAGE & CREDITS: - see TinyWireM.h
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*/
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//#define DEBUG
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#include <TinyWireM.h> // I2C Master lib for ATTinys which use USI - comment this out to use with standard arduinos
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#include <LiquidCrystal_I2C.h> // for LCD w/ GPIO MODIFIED for the ATtiny85
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#define GPIO_ADDR 0x27 // (PCA8574A A0-A2 @5V) typ. A0-A3 Gnd 0x20 / 0x38 for A - 0x27 is the address of the Digispark LCD modules.
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LiquidCrystal_I2C lcd(GPIO_ADDR,16,2); // set address & 16 chars / 2 lines
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void setup(){
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TinyWireM.begin(); // initialize I2C lib - comment this out to use with standard arduinos
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lcd.init(); // initialize the lcd
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lcd.backlight(); // Print a message to the LCD.
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lcd.print("Digispark!");
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}
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void loop(){
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}
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