#include <reg51.h>
#include <intrins.h>
sbit RS = P3^0
sbit RW = P3^3
sbit E = P3^4
sbit PSB = P3^1 //串并口选择
sbit RES = P3^5
#define FIRST_ADDR 0 //定义字符/汉字显示起始位置
//延时子程序
void delay(unsigned int t)
{ unsigned int i,j
for(i=0i<ti++)
for(j=0j<10j++)
}
//测忙
void chk_busy()
{ RS=0
RW=1
E=1
while((P1&0x80)==0x80)
E=0
}
//读数据
unsigned char lcdrd()
{ unsigned char i
P3=0xFB
_nop_()
E=1
delay(5)
i=P1
_nop_()
E=0
return i
}
//写数据
void lcdwd(unsigned char dispdata)
{ chk_busy()
_nop_()
RS=1
RW=0
E=1
P1=dispdata
delay(5)
_nop_()
E=0
_nop_()
P1=0xff
}
//写指令代码
void lcdwc(unsigned char cmdcode)
{ chk_busy()
_nop_()
RS=0
RW=0
E=1
P1=cmdcode
delay(5)
_nop_()
E=0
_nop_()
P1=0xff
}
//初始化
void lcdreset()
{ delay(2000)
lcdwc(0x30) //选择基本指令集
lcdwc(0x30) //选择8bit数据流
delay(5)
lcdwc(0x0c) //开显示(无游标、肆返则不反白)
delay(5)
lcdwc(0x01) //清除显示，并且设定地址指针为00H
delay(5)
lcdwc(0x06) //指定在资料的读取及写入时，设定游标的移动方向及指定显示的移位
}
void hzkdis(unsigned char code *s)
{ while(*s>0)
{ lcdwd(*s)
s++
delay(500)
}
}
void hzklib()
{ lcdwc(0x80+FIRST_ADDR)
hzkdis("少小离家老大回，")
lcdwc(0x90+FIRST_ADDR)
hzkdis("乡音无改鬓毛衰。")
lcdwc(0x88+FIRST_ADDR)
hzkdis("儿童相见不相识裂棚，")
lcdwc(0x98+FIRST_ADDR)
hzkdis("笑问客从何处来。"世铅)
}
//整屏显示
//当ii=0时显示上面128×32
//当ii=8时显示下面128×32
void lcdfill(unsigned char disdata)
{ unsigned char x,y,ii
for(ii=0ii<9ii+=8)
for(y=0y<0x20y++)
for(x=0x<8x++)
{ lcdwc(0x36)
lcdwc(y+0x80) //行地址
lcdwc(x+0x80+ii)//列地址
lcdwc(0x30)
lcdwd(disdata)
lcdwd(disdata)
}
}
//当ii=0时显示上面128×32
//当ii=8时显示下面128×32
void lcdfill_upright(unsigned char disdata)
{ unsigned char x,y,ii
unsigned char i,f,k
for(ii=0ii<9ii+=8)
for(y=0y<4y++)
{ f=disdata
for(i=0i<8i++)
{ if((f&1)==1)
k=0xff
else
k=0
for(x=0x<8x++)
{ lcdwc(0x36)
lcdwc(y*8+i+0x80)
lcdwc(x+0x80+ii)
lcdwc(0x30)
lcdwd(k)
lcdwd(k)
}
f>>=1
}
}
}
main()
{ unsigned char i
i=0x55
RES=0
_nop_()
RES=1
while(1)
{ PSB=1
RW=0
lcdreset() //初始化LCD屏
lcdwc(0x01)
delay(1000)
lcdfill(0xff)
delay(6000)
lcdfill(i) //显示竖条
delay(6000)
lcdfill_upright(i) //显示横条
delay(6000)
lcdfill(0)
lcdwc(0x01)
delay(1000)
hzklib()
delay(4000)
i=~i
}
}
要知道要测量的电流最大值是多少，然后计算一下，5V电压/最大电流，得到电镇茄阻值，买一个这个阻值的电阻，要求电阻的唯旅颂精度要高，误差最好在0.1%以下，或精度更高的。好了，让待测量的电流通过电阻，则在电阻上产指郑生最大5V的电压，取出这个模拟电压，送到单片机。
STC单片机内部有AD电路，就转换成数字量了，再计算出对应的电流值，就可以送LCD上显示了。
这是一个温湿度检测的程序，可以参考一下：#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#include <string.h>
#include <absacc.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int
sbit LcdRs=P2^0 //1602液晶端口定义
sbit LcdRw=P2^1
sbit LcdEn=P2^2
sbit led1=P3^0
sbit led2=P3^4 //报警灯端口定义
sbit ACC0=ACC^0
sbit ACC7=ACC^7
sbit k_ud=P2^4//定义上下限选择
sbit k_ws=P2^5//定义温度/湿度 选择
sbit k_add=P2^6//定义按键 +
sbit k_sub=P2^7//定义按键 -
bit flag_ud,flag_ws
bit start
uchar str[7]
//向LCD写命令
#define LCD_COMMAND 0//Command
#define LCD_DATA 1 //Data
#define LCD_CLEAR_SCREEN 0x01 //清屏
#define LCD_HOMING0X02 //光标返回原点
//设置显示模式
#define LCD_SHOW 0x04 //显示开
#define LCD_HIDE 0x00 //显示关举念
#define LCD_CURSOR0x02 //显示光标
#define LCD_NO_CURSOR 0x00 //无光标
#define LCD_FLASH 0x01 //光标闪动
#define LCD_NO_FLASH 0x00 //光标不闪动
//输入设置
#define LCD_AC_UP 0x02
#define LCD_AC_DOWN 0x00 //default
#define LCD_MOVE 0x01 //画面可平移
#define LCD_NO_MOVE 0x00 //default
unsigned char TEMP_UP=20 //温度上限
unsigned char TEMP_DOWN=0 //温度下限
unsigned char HUMUP=30//湿度上限
unsigned char HUMDOWN=10//湿度下限
unsigned char dis[4]
unsigned char LCD_Wait(void)
//SHT10设置
sbit SCK =P1^2 //定义通讯时钟端口
sbit DATA=P1^3 //定义通讯数据端口
typedef union
{ uint i//定义了两个共用体
float f
}value
enum {TEMP,HUMI}//TEMP=0,HUMI=1
#define noACK 0 //用于判断是否结束通讯
#define ACK 1 //结束数据传输
//adr command r/w
#define STATUS_REG_W 0x06 //000 0011 0
#define STATUS_REG_R 0x07 //000 0011 1
#define MEASURE_TEMP 0x03 //000 0001 1
#define MEASURE_HUMI 0x05 //000 0010 1
#define RESET0xle //运雹000 1111 0
//定义函数
void s_transstart(void) //启动传输函数
void s_connectionreset(void) //连接复位函数
char s_write_byte(unsigned char value)//SHT10写函数正悄困
char s_read_byte(unsigned char ack)//SHT10读函数
char s_measure(unsigned char*p_value,unsigned char*p_checksum,unsigned char mode)//测量温湿度函数
void calc_dht90(float*p_humidity,float*p_temperature)//温湿度补偿
void LCD_Write(bit style, unsigned char input)
//液晶显示子程序
void delay(uint z) //延时函数
{
int x
for(x=zx>0x--)
{
int y
for(y=110y>0y--)
}
}
void dat_char(uchar ff,uchar a)
{
dis[0]=ff
dis[1]='_'
dis[2]=0x30+a/10
dis[3]=0x30+a%10
}
void LCD_Write(bit style,unsigned char input)
{
LcdRs=style
P0=input
delay(5)
LcdEn=1
delay(5)
LcdEn=0
}
void LCD_SetDisplay(unsigned char DisplayMode) //设置输出
{
LCD_Write(LCD_COMMAND,0x08|DisplayMode)
}
void LCD_SetInput(unsigned char InputMode) //设置输入
{
LCD_Write(LCD_COMMAND,0x04|InputMode)
}
void LCD_Initial()//初始化LCD函数
{
LcdEn=0
LCD_Write(LCD_COMMAND,0x38) //8位数据端口，2行显示，5*7点阵
LCD_Write(LCD_COMMAND,0x38)
LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR)//开启显示，无光标
LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN) //清屏
LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE) //AC递增，画面不动
}
void GotoXY(uchar x, uchar y) //液晶字符输入的位置
{
if(y==0)
LCD_Write(LCD_COMMAND,0x80|x)
if(y==1)
LCD_Write(LCD_COMMAND,0x80|(x-0x40))
}
void Rrint(uchar *str) //将字符输出到液晶显示
{
while(*str!='\0')
{
LCD_Write(LCD_DATA,*str)
str++
}
}
void zhuanhuan(float a) //浮点数转换成字符串函数
{
memset(str,0,sizeof(str))
sprintf(str,"%f",a)
}
void welcome() //初始界面函数
{
LCD_Initial()
GotoXY(0,0)
Rrint(" Welcome! ")
GotoXY(0,1)
Rrint(" Code of sht10 ")
delay(200)
}
/*
void delay_n10us(uint n) //延时n个10us@12M晶振
{
uint i
for(i=ni>0i--)
{
_nop_()_nop_()_nop_()
_nop_()_nop_()_nop_()
}
} */
void s_transstart(void) //启动函数
{
DATA=1SCK=0
_nop_()
SCK=1
_nop_()
DATA=0
_nop_()
SCK=0
_nop_()_nop_()_nop_()
SCK=1
_nop_()
DATA=1
_nop_()
SCK=0
}
void s_connectionreset(void) //连接复位函数
{
uchar i
DATA=1SCK=0 //Initial state
for(i=0i<9i++) //9 SCK cycles
{
SCK=1
SCK=0
}
s_transstart()
}
char s_write_byte(unsigned char value)//SHT10写字节函数
{
uchar i,error=0
for (i=0x80i>0i/=2) //shift bie for masking
{
if(i&value)DATA=1 //masking value with i,write to SENSI-BUS
else DATA=0
SCK=1
_nop_()_nop_()_nop_() //pulswith approx. 3 us
SCK=0
}
DATA=1 //release DATA-line
SCK=1 //clk#9for ack
error=DATA //check ack(DATA will be pulled down by DHT90),DATA在第9个上升沿将被DHT90自动下拉为低电平。
_nop_()_nop_()_nop_()
SCK=0
DATA=1//release DATA-line
return error //error=1 in case of no acknowledge//返回：0成功 1失败
}
//SHT10读取函数
char s_read_byte(uchar ack)
{
uchar i,val=0
DATA=1 //release DATA-line
for(i=0x80i>0i/=2)//shift bit for masking
{SCK=1
if(DATA)val=(val|i)//read bit
_nop_()_nop_()_nop_()//pulswith approx.3 us
SCK=0
}
if(ack==1)DATA=0//in case of"ack==1"pull down DATA-Line
else DATA=1//如果是校验（ack=0)，读取完后结束通讯
_nop_()_nop_()_nop_() //pulswith approx. 3 us
SCK=1//clk#9 for ack
_nop_()_nop_()_nop_() //pulswith approx. 3 us
SCK=0
_nop_()_nop_()_nop_() //pulswith approx. 3 us
DATA=1 //release DATA-line
return val
}
//测量温湿度函数
char s_measure(uchar *p_value,uchar *p_checksum,uchar mode)
{
unsigned error=0
uint i
s_transstart() //transstart atart
switch(mode) //send command to sensor
{
case TEMP :error+=s_write_byte(MEASURE_TEMP)break
case HUMI :error+=s_write_byte(MEASURE_HUMI)break
default :break
}
for(i=0i<65535i++)if(DATA==0)break //wait until sensor has finishede the measurement
if(DATA)error+=1 //or timeout(~2 sec.)is reached
*(p_value) =s_read_byte(ACK) //read the first byte(MSB)
*(p_value+1)=s_read_byte(ACK) //read the second byte(LSB)
*p_checksum=s_read_byte(noACK) //read checksum
return error
}
void calc_sht90(float*p_humidity,float*p_temperature) //温湿度补偿函数
{
const float C1=-4.0//for 12 Bit
const float C2=+0.0405 //for 12 Bit
const float C3=-0.0000028 //for 12 Bit
const float T1=+0.01 //for 14 Bit@5V
const float T2=+0.00008 //for 14 Bit@5V
float rh=*p_humidity //rh: Humidity[Ticks]12 Bit
float t=*p_temperature//t: Temperature[Ticks]14 Bit
float rh_lin //rh_lin: Humidity linear
float rh_true //rh_true:Temperature compensated humidity
float t_C //t_C : Temperature[C]
t_C=t*0.01-40 //calc.temperature from ticks to [C]
rh_lin=C3*rh*rh+C2*rh+C1 //calc.humidity from ticks to[%RH]
rh_true=(t_C-25)*(T1+T2*rh)+rh_lin //calc.temperature compensated humidity[%RH]
if(rh_true>100)rh_true=100 //cut if the value is outside of
if(rh_true<0.1)rh_true=0.1 //the physical possible range
*p_temperature=t_C //return temperature[C]
*p_humidity=rh_true //return humidity[%RH]
}
void keyscan()
{
if(k_ud==0)
{
delay(10)//去抖动 100ms
if(k_ud==0)
{
while(!k_ud)
flag_ud = ~flag_ud
}
}
if(k_ws==0)
{
delay(10)//去抖动 100ms
if(k_ws==0)
{
while(!k_ws)
flag_ws = ~flag_ws
}
}
if(k_add==0)
{
delay(10)//去抖动 100ms
if(k_add==0)
{
while(!k_add)
GotoXY(12,0)
if(!flag_ws)
{
if(flag_ud){TEMP_UP++dat_char('T',TEMP_UP)}
else {TEMP_DOWN++dat_char('T',TEMP_DOWN)}
Rrint(&dis)
}
else
{
if(flag_ud){HUMUP++dat_char('H',HUMUP)}
else {HUMDOWN++dat_char('H',HUMDOWN)}
Rrint(&dis)
}
}
}
if(k_sub==0)
{
delay(10)//去抖动 100ms
if(k_sub==0)
{
while(!k_sub)
GotoXY(12,1)
if(!flag_ws)
{
if(flag_ud){TEMP_UP--dat_char('T',TEMP_UP)}
else {TEMP_DOWN--dat_char('T',TEMP_DOWN)}
Rrint(&dis)
}
else
{
if(flag_ud){HUMUP--dat_char('H',HUMUP)}
else {HUMDOWN--dat_char('H',HUMDOWN)}
Rrint(&dis)}
}
}
}
//主函数
void main()
{
value humi_val,temp_val
unsigned char error,checksum
bit status_th=0,status_ch=0
unsigned char cnt=0
LCD_Initial()
LcdRw=0
led1=0
led2=0
start=0
s_connectionreset()
welcome()//显示欢迎画面
delay(20000)
while(1)
{
cnt++
if(!(cnt%10))
{
cnt=0
error=0
error+=s_measure((unsigned char*)&humi_val.i,&checksum,HUMI)
error+=s_measure((unsigned char*)&temp_val.i,&checksum,TEMP)
if(error!=0)
{
s_connectionreset() //in case of an erroe:connection reset
}else
{
humi_val.f=(float)humi_val.i //converts integer to float
temp_val.f=(float)temp_val.i //converts integer to float
calc_sht90(&humi_val.f,&temp_val.f)//计算温度与湿?
LCD_Initial()
GotoXY(0,0)
Rrint("Tep:")
GotoXY(0,1)
Rrint("Hum:")
zhuanhuan(temp_val.f) //转换温度为uchar方便液晶显示
GotoXY(4,0)
str[5]=0xDF //℃的符号
str[6]=0x43
str[7]='\0'
Rrint(str)
if(temp_val.f>TEMP_UP-1||temp_val.f<TEMP_DOWN)
led1=1
else
led1=0
zhuanhuan(humi_val.f) //转换湿度为uchar方便液晶显示
GotoXY(4,1)
str[5]='%' //%的符号
str[6]='\0' //字符串结束标志
Rrint(str)
if((humi_val.f>HUMUP-1)||(humi_val.f<HUMDOWN))
led2=1
else
led2=0
}
}
if(!flag_ws) {GotoXY(12,0)dat_char('T',TEMP_UP)Rrint(&dis)GotoXY(12,1)dat_char('T',TEMP_DOWN)Rrint(&dis)}
else {GotoXY(12,0)dat_char('H',HUMUP)Rrint(&dis)dat_char('H',HUMDOWN)GotoXY(12,1)Rrint(&dis)}
keyscan()
}
}
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