DS1621恒温控制-控制继电器制作-90S2313-热传感器DS1621-2七段LED显示-转载自外国网站

sydz · 发表于 2011-12-4 15:56:07

已建立了这个恒温控制电热元件。为此，他使用了达拉斯热传感器DS1621可通过I2C接口读取。他用于AVR的2313系列MCU读取传感器数据和2七段LED指示灯显示。

控制继电器切换点是容易 - 只需两个按钮UP和DOWN。同时按下两个按钮允许设置的滞后和LED刷新占空比。该设备的电源转换器内置INT准备被插入的任何地方，在你需要控制温度的好处。电路和源代码可供下载。

程序：

/*
Jesper Hansen <jesperh@telia.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Thermostat regulator with Dallas DS1621.
----------------------------------------
2000-11-24
CPU: At90S2313
Switches are at PD2 and PD3, common ground
LED segments a-g are at PB0 - PB7, and
the anodes are at PD0 and PD1
The relay are at PD6, active high
Dallas DS1621 I2C bus are connected at
PD4 = SDA
PD5 = SCL
*/
#include <io.h>
#include <io.h>
#include <progmem.h>
#include <eeprom.h>
#include <signal.h>
#include <interrupt.h>
#include "delay.h"
#include "i2c.h"
// PORT D
#define KEYUP PD2
#define KEYDN PD3
#define LED1 PD0
#define LED2 PD1
#define SDA PD4
#define SCL PD5
#define RELAY PD6
// PORT B
#define SEG_a 0x01
#define SEG_b 0x02
#define SEG_c 0x04
#define SEG_d 0x08
#define SEG_e 0x10
#define SEG_f 0x20
#define SEG_g 0x40
#define SEG_dot 0x80
// MISC
// eeprom storage positions
#define EEPROM_SETTEMP 0x11
#define EEPROM_HYSTERESIS 0x13
#define EEPROM_DUTYVALUE 0x15
#define BLINKCOUNT 80
#define KEY_UP 0x01
#define KEY_DOWN 0x02
#define KEY_BOTH (KEY_UP|KEY_DOWN)
//
// mode setting enums
//
typedef enum mode_e
{
NORMAL,
SET_HYST,
SET_DUTY,
} mode_e;
mode_e next_mode[] = {SET_HYST, SET_DUTY, NORMAL};
mode_e mode = NORMAL;
unsigned char digits[] = {
(SEG_a|SEG_b|SEG_c|SEG_d|SEG_e|SEG_f), // 0
(SEG_b|SEG_c), // 1
(SEG_a|SEG_b|SEG_d|SEG_e|SEG_g), // 2
(SEG_a|SEG_b|SEG_c|SEG_d|SEG_g), // 3
(SEG_b|SEG_c|SEG_c|SEG_f|SEG_g), // 4
(SEG_a|SEG_c|SEG_d|SEG_f|SEG_g), // 5
(SEG_a|SEG_c|SEG_d|SEG_e|SEG_f|SEG_g), // 6
(SEG_a|SEG_b|SEG_c), // 7
(SEG_a|SEG_b|SEG_c|SEG_d|SEG_e|SEG_f|SEG_g), // 8
(SEG_a|SEG_b|SEG_c|SEG_d|SEG_f|SEG_g), // 9
(SEG_a), // mode 1 indicator
(SEG_g), // mode 2 indicator
(SEG_d), // mode 3 indicator
};
unsigned char set_temp = 20; // initial set temperature
unsigned char set_flag = 0; // no settings in progress
unsigned char hysteresis = 1; // initial hysteresis
unsigned char dutyvalue = 3; // initial duty-cycle
unsigned char relay_on = 0; // initial relay state
// timer 0 handles multiplex and refresh of the displays
#define TI0_L (256-64)
volatile unsigned char flip = 0;
volatile unsigned char dutycount = 0;
volatile unsigned char temp = 20;
unsigned char dotcount = BLINKCOUNT;
SIGNAL(SIG_OVERFLOW0) //timer 0 overflow
{
unsigned char b = 0;
// reload timer
outp(TI0_L, TCNT0);
// both displays off
sbi(PORTD, LED1);
sbi(PORTD, LED2);
dutycount++;
if (dutycount == dutyvalue)
{
dutycount = 0;
switch (mode)
{
case NORMAL:
// see which one we need to update
if (flip) // high ?
b = (temp / 10);
else
b = temp % 10;
break;
case SET_HYST :
// see which one we need to update
if (flip) // high ?
b = 10; // mode indicator
else
b = hysteresis;
break;
case SET_DUTY :
// see which one we need to update
if (flip) // high ?
b = 11; // mode indicator
else
b = dutyvalue;
break;
}
// set digit data on port
outp(digits[b], PORTB);
if (flip) // left LED
{
if (dotcount < BLINKCOUNT/2)
sbi(PORTB,7);
if (dotcount)
dotcount--;
else
dotcount = BLINKCOUNT;
cbi(PORTD, LED1);
}
else
{
if (relay_on)
sbi(PORTB,7);
cbi(PORTD, LED2);
}
flip = !flip;
}
}
void start_timer_0(void)
{
//setup timer 0
outp(0x03, TCCR0); // prescaler /64 tPeriod = 10.667 uS
sbi(TIMSK, TOIE0); // enable timer1 interrupt
outp(TI0_L,TCNT0); // load timer
sei(); // start timer by enabling interrupts
}
int getkey(void)
{
int ret_val = 0;
// if none of the keys are down,
// return zero
if (bit_is_set(PIND, KEYUP) && bit_is_set(PIND, KEYDN) )
return 0;
// debounce 80 mS
delay(40000);
delay(40000);
// now read again and return status
if (bit_is_clear(PIND, KEYUP))
ret_val |= KEY_UP;
if (bit_is_clear(PIND, KEYDN))
ret_val |= KEY_DOWN;
return ret_val;
}
int main(void)
{
unsigned char i2cdata[8];
// set port B as all outputs
// and initially set all pins HI
outp(0xff,PORTB);
outp(0xff,DDRB);
// set common LED pins as output
// and initially set them HI
// set RELAY pin as output, and initially set it LO (off)
// also activate pullups on keyboard inputs
outp((1<<LED1)|(1<<LED2)|(1<<RELAY),DDRD);
outp((1<<LED1)|(1<<LED2)|(1<<KEYUP)|(1<<KEYDN),PORTD);
i2c_init();
// restore data from eeprom
// and make sure values are sane
set_temp = eeprom_rb(EEPROM_SETTEMP);
if (set_temp > 40 || set_temp < 1)
set_temp = 20;
hysteresis = eeprom_rb(EEPROM_HYSTERESIS);
if (hysteresis > 5)
hysteresis = 1;
dutyvalue = eeprom_rb(EEPROM_DUTYVALUE);
if (dutyvalue > 10 || dutyvalue < 1)
dutyvalue = 3;
// Setup DS1621
// Access Config Command
// Set Continuous transfer, polarity active lo
i2c_send(0x90, 0xAC, 1, "\0x00");
delay(1000);
// Start conversion
i2c_send(0x90, 0xEE, 0, 0);
// start the timer
start_timer_0();
while (1)
{
// check switch status
if (temp >= set_temp+hysteresis)
{
relay_on = 0;
cbi(PORTD, RELAY); // relay OFF
}
if (temp <= set_temp-hysteresis)
{
relay_on = 1;
sbi(PORTD, RELAY); // relay ON
}
// check keys
switch (getkey())
{
case KEY_UP :
if (set_flag) // don't change set_temp on first press
{
switch (mode)
{
case NORMAL :
set_temp++; // increment set temperature
break;
case SET_HYST :
hysteresis++; // increment hysteresis
break;
case SET_DUTY :
dutyvalue++; // increment duty value
break;
}
}
set_flag = 50; // set timeout flag for display
break;
case KEY_DOWN :
if (set_flag) // don't change set_temp on first press
{
switch (mode)
{
case NORMAL :
set_temp--; // decrement set temperature
break;
case SET_HYST :
hysteresis--; // decrement hysteresis
break;
case SET_DUTY :
dutyvalue--; // decrement duty value
break;
}
}
set_flag = 50; // set timeout flag for display
break;
case KEY_BOTH :
mode = next_mode[mode];
set_flag = 50;
break;
}
delay(10000);
if (set_flag)
{
set_flag--;
if (set_flag == 0)
{
switch (mode)
{
case NORMAL:
eeprom_wb(EEPROM_SETTEMP,set_temp);
break;
case SET_HYST :
eeprom_wb(EEPROM_HYSTERESIS,hysteresis);
break;
case SET_DUTY :
eeprom_wb(EEPROM_DUTYVALUE,dutyvalue);
break;
}
mode = NORMAL;
}
temp = set_temp;
}
else
{
// read temp
i2c_receive(0x90,0xAA, 2, i2cdata);
temp = *i2cdata;
}
}
}

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DS1621恒温控制-控制继电器制作-90S2313-热传感器DS1621-2七段LED显示-转载自外国网站

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