Digital Thermometer
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This program demonstrates how to communicate with a DS1620 chip to check for the room temperature in degree Celsius. Once the program has the temperature, it proceeds to display it on a LCD using large digits.
In this example we use the following components:
/***********************************************************
* MATRIX ORBITAL - DISPLAY TEMPERATURE SAMPLE CODE
* December 16, 2002
* This program demonstrates how to communicate with a DS1620 chip
* to check for the room temperature in degree Celsius.
* Once the program has the temperature, it proceeds to display it on a
* CD using large digits.
* The program iterates endlessly checking and displaying the
* temperature every minute.
* LIMITATIONS:
* 1. This program assumes that the temperature will never be below 0
* or above 99 degrees Celsius.
* 2. This program also assumes a minimum LCD size of 4 rows by 20
* columns.
***********************************************************/
// Stamp core basic classes
import stamp.core.*;
// This class encapsulates the basic capabilities of the Dallas DS1620 3-wire
// temperature sensor
import stamp.peripheral.sensor.temperature.DS1620;
public class DisplayTemp {
// A virtual peripheral UART.
// Each instance of this class provides asynchronous serial communication
// ina single direction. For full-duplex communications create two Uart
// objects, one for each direction.
// Uart.dirTransmit -> Uart will be used to transmit data only.
// CPU.pin0 -> Pin used to transmit data
// Uart.dontInvert -> data is not inverted
// Uart.speed19200 -> serial data transfer speed (baud rate)
// Uart.stop1 -> Number of stop bits used is 1
static Uart txUart = new Uart(Uart.dirTransmit, CPU.pin0, Uart.dontInvert,
Uart.speed19200, Uart.stop1 );
// main function drives the program
public static void main() {
// Creates DS1620 temperature sensor object
// CPU.pin4: Data pin
// CPU.pin5: Clock pin
// CPU.pin6: RST
DS1620 indoor = new DS1620(CPU.pin4,CPU.pin5,CPU.pin6);
int iTemp = 0; // Holds temperature in Celsious
int iTenths = 0; // Most significant digit of temperature (Tenths)
int iOnes = 0; // Least significant digit of temperature (Ones)
// General display settings
// Clear screen
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x58); // Clear command
// Underline Off
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x4B); // Underline off command
// Blinking Off
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x54); // Blinking off command
// Display 'Degree Celsius' beside number of degrees
// Position cursor
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x47); // Move cursor command
txUart.sendByte(0x09); // column position
txUart.sendByte(0x02); // row position
// Send text to the above cursor position
txUart.sendString("Degrees"); //Sends the word "Degrees" to the LCD
// Next Line - Move cursor to the next line
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x47); // Move cursor command
txUart.sendByte(0x09); // column position
txUart.sendByte(0x03); // row position
// Send text to the above position
txUart.sendString("Celsius"); // Sends the word "Celsius" to the LCD
// Large Digits On
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x6E); // Large digits on command
// Infinite Loop that checks current temperature and displays it
while(true)
{
// Get Temperature in Celsius
iTemp = indoor.getTempC(); // Requests temperature from DS1620
// Get tenths - the most significant digit to display first
iTenths = (int)iTemp / 10;
// Get ones - the least significant digit to display second
iOnes = iTemp - iTenths * 10;
// Send temperature to lcd - first tenths then ones
// Send tenths
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x23); // Large digit command
txUart.sendByte(0x01); // Column location - Large digits take-up 3 cols
txUart.sendByte(iTenths); // Digit - Takes up columns 1, 2, and 3
// Send ones - leave column 4 blank
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x23); // Large digit command
txUart.sendByte(0x05); // Column location - 1,2,3 taken-up by tenths
txUart.sendByte(iOnes); // Digit - Takes up columns 5, 6, an 7
// Pause for a minute - maximum delay is 32 seconds
CPU.delay(32000); // Pauses for 32 seconds
CPU.delay(32000); // Pauses for 32 seconds
}
}
}
For technical discussions and questions, please visit our forums
- LK204-25 display
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/***********************************************************
* MATRIX ORBITAL - DISPLAY TEMPERATURE SAMPLE CODE
* December 16, 2002
* This program demonstrates how to communicate with a DS1620 chip
* to check for the room temperature in degree Celsius.
* Once the program has the temperature, it proceeds to display it on a
* CD using large digits.
* The program iterates endlessly checking and displaying the
* temperature every minute.
* LIMITATIONS:
* 1. This program assumes that the temperature will never be below 0
* or above 99 degrees Celsius.
* 2. This program also assumes a minimum LCD size of 4 rows by 20
* columns.
***********************************************************/
// Stamp core basic classes
import stamp.core.*;
// This class encapsulates the basic capabilities of the Dallas DS1620 3-wire
// temperature sensor
import stamp.peripheral.sensor.temperature.DS1620;
public class DisplayTemp {
// A virtual peripheral UART.
// Each instance of this class provides asynchronous serial communication
// ina single direction. For full-duplex communications create two Uart
// objects, one for each direction.
// Uart.dirTransmit -> Uart will be used to transmit data only.
// CPU.pin0 -> Pin used to transmit data
// Uart.dontInvert -> data is not inverted
// Uart.speed19200 -> serial data transfer speed (baud rate)
// Uart.stop1 -> Number of stop bits used is 1
static Uart txUart = new Uart(Uart.dirTransmit, CPU.pin0, Uart.dontInvert,
Uart.speed19200, Uart.stop1 );
// main function drives the program
public static void main() {
// Creates DS1620 temperature sensor object
// CPU.pin4: Data pin
// CPU.pin5: Clock pin
// CPU.pin6: RST
DS1620 indoor = new DS1620(CPU.pin4,CPU.pin5,CPU.pin6);
int iTemp = 0; // Holds temperature in Celsious
int iTenths = 0; // Most significant digit of temperature (Tenths)
int iOnes = 0; // Least significant digit of temperature (Ones)
// General display settings
// Clear screen
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x58); // Clear command
// Underline Off
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x4B); // Underline off command
// Blinking Off
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x54); // Blinking off command
// Display 'Degree Celsius' beside number of degrees
// Position cursor
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x47); // Move cursor command
txUart.sendByte(0x09); // column position
txUart.sendByte(0x02); // row position
// Send text to the above cursor position
txUart.sendString("Degrees"); //Sends the word "Degrees" to the LCD
// Next Line - Move cursor to the next line
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x47); // Move cursor command
txUart.sendByte(0x09); // column position
txUart.sendByte(0x03); // row position
// Send text to the above position
txUart.sendString("Celsius"); // Sends the word "Celsius" to the LCD
// Large Digits On
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x6E); // Large digits on command
// Infinite Loop that checks current temperature and displays it
while(true)
{
// Get Temperature in Celsius
iTemp = indoor.getTempC(); // Requests temperature from DS1620
// Get tenths - the most significant digit to display first
iTenths = (int)iTemp / 10;
// Get ones - the least significant digit to display second
iOnes = iTemp - iTenths * 10;
// Send temperature to lcd - first tenths then ones
// Send tenths
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x23); // Large digit command
txUart.sendByte(0x01); // Column location - Large digits take-up 3 cols
txUart.sendByte(iTenths); // Digit - Takes up columns 1, 2, and 3
// Send ones - leave column 4 blank
txUart.sendByte(0xFE); // Command Prefix
txUart.sendByte(0x23); // Large digit command
txUart.sendByte(0x05); // Column location - 1,2,3 taken-up by tenths
txUart.sendByte(iOnes); // Digit - Takes up columns 5, 6, an 7
// Pause for a minute - maximum delay is 32 seconds
CPU.delay(32000); // Pauses for 32 seconds
CPU.delay(32000); // Pauses for 32 seconds
}
}
}
For technical discussions and questions, please visit our forums
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