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This commit is contained in:
Erik Tylek Kettenburg
2015-06-23 12:42:35 -07:00
parent bc55c9bb45
commit 6ca6b114d5
3581 changed files with 93 additions and 51 deletions
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digistump-avr/libraries/Wire/examples/Tiny85_Temp_LCD/Tiny85_Temp_LCD.pde Normal file
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/* ATtiny85 as an I2C Master Ex2 BroHogan 1/21/11
* I2C master reading DS1621 temperature sensor. Display to I2C GPIO LED.
* SETUP:
* ATtiny Pin 1 = (RESET) N/U ATtiny Pin 2 = (D3) N/U
* ATtiny Pin 3 = (D4) to LED1 ATtiny Pin 4 = GND
* ATtiny Pin 5 = SDA on DS1621 & GPIO ATtiny Pin 6 = (D1) to LED2
* ATtiny Pin 7 = SCK on DS1621 & GPIO ATtiny Pin 8 = VCC (2.7-5.5V)
* NOTE! - It's very important to use pullups on the SDA & SCL lines!
* DS1621 wired per data sheet. This ex assumes A0-A2 are set LOW for an addeess of 0x48
* PCA8574A GPIO was used wired per instructions in "info" folder in the LiquidCrystal_I2C lib.
* This ex assumes A0-A2 are set HIGH for an addeess of 0x3F
* LiquidCrystal_I2C lib was modified for ATtiny - on Playground with TinyWireM lib.
* TinyWireM USAGE & CREDITS: - see TinyWireM.h
*/
//#define DEBUG
#include <TinyWireM.h> // I2C Master lib for ATTinys which use USI
#include <LiquidCrystal_I2C.h> // for LCD w/ GPIO MODIFIED for the ATtiny85
#define GPIO_ADDR 0x3F // (PCA8574A A0-A2 @5V) typ. A0-A3 Gnd 0x20 / 0x38 for A
#define DS1621_ADDR 0x48 // 7 bit I2C address for DS1621 temperature sensor
#define LED1_PIN 4 // ATtiny Pin 3
#define LED2_PIN 1 // ATtiny Pin 6
int tempC = 0; // holds temp in C
int tempF = 0; // holds temp in F
LiquidCrystal_I2C lcd(GPIO_ADDR,16,2); // set address & 16 chars / 2 lines
void setup(){
#ifdef DEBUG
pinMode(LED1_PIN,OUTPUT);
pinMode(LED2_PIN,OUTPUT);
Blink(LED1_PIN,2); // show it's alive
#endif
TinyWireM.begin(); // initialize I2C lib
Init_Temp(); // Setup DS1621
lcd.init(); // initialize the lcd
lcd.backlight(); // Print a message to the LCD.
lcd.print("Hello, Temp!");
delay (2000);
}
void loop(){
Get_Temp(); // read current temperature
lcd.clear(); // display it
lcd.print("C: ");
lcd.print(tempC,DEC);
lcd.setCursor(7,0);
lcd.print("F: ");
lcd.print(tempF,DEC);
#ifdef DEBUG
Blink(LED1_PIN,tempC/10); // blink 10's of temperature on LED 1
delay (1000);
Blink(LED2_PIN,tempC%10); // blink 1's of temperature on LED 2
#endif
delay (4000); // wait a few sec before next reading
}
void Init_Temp(){ // Setup the DS1621 for one-shot mode
TinyWireM.beginTransmission(DS1621_ADDR);
TinyWireM.send(0xAC); // Access Command Register
TinyWireM.send(B00000001); // Using one-shot mode for battery savings
//TinyWireM.send(B00000000); // if setting continious mode for fast reads
TinyWireM.endTransmission(); // Send to the slave
}
void Get_Temp(){ // Get the temperature from a DS1621
TinyWireM.beginTransmission(DS1621_ADDR);
TinyWireM.send(0xEE); // if one-shot, start conversions now
TinyWireM.endTransmission(); // Send 1 byte to the slave
delay(750); // if one-shot, must wait ~750 ms for conversion
TinyWireM.beginTransmission(DS1621_ADDR);
TinyWireM.send(0xAA); // read temperature (for either mode)
TinyWireM.endTransmission(); // Send 1 byte to the slave
TinyWireM.requestFrom(DS1621_ADDR,1); // Request 1 byte from slave
tempC = TinyWireM.receive(); // get the temperature
tempF = tempC * 9 / 5 + 32; // convert to Fahrenheit
}
#ifdef DEBUG
void Blink(byte led, byte times){ // poor man's GUI
for (byte i=0; i< times; i++){
digitalWrite(led,HIGH);
delay (400);
digitalWrite(led,LOW);
delay (175);
}
}
#endif