基于MSP430的土壤温湿度及光照参数检测模块

1、各个模块与MSP430F5309连接图：作者：Edison.NO1116各个模块实物图：DHT11温湿度模块DHT11是数字的湿度传感器.6元一个买的.与它的通信方式类似于I2C总线通信.串行数据一次返回40位.数据格式:8bit湿度整数数据+8bit湿度小数数据+8bi温度整数数据+8bit温度小数数据+8bit校验和数据传送正确时校验和数据等于“8bit湿度整数数据+8bit湿度小数数据+8bi温度整数数据+8bit温度小数数据”所得结果的末8位。如果模块离芯片距离近,建议在数据线接一5k电阻上拉.时序图如下:第一次拉低要求至少18ms，之后拉高20-40us，之后DHT拉低80us后再拉

2、高80us.之后进入数据阶段.每个数据,0,1以高电平的 时间长短区分.0数据高电平时间为26-28us,1为70us.不论1或者0，之前都先输出50us的低电平.数据传输完成后拉高总线.TSL245光照模块MSP430程序代码：#include #include /P2.1dht11温湿度测量接口/P2.2-illu value read enabledtsl245片选、供电接口/P2.3-soilresi value read enabled土壤电阻率测量片选、供电接口/P2.4-soil frequent and illu frequent inputtsl245和土壤电阻率模块频率输入

3、口#define HIGH P2OUT|=BIT1;#define LOW P2OUT&=BIT1;long int count,freqvalue;int i,temp16,humd16,freqmeasureenabled;char temph,templ,humdh,humdl,check,cal;void DelayNus(int n)TA1CCR0 = n; /syb changedTA1CCTL0 |= MC_1; /增计数到CCR0while(!(TA1CTL & BIT0); /等待TA1CTL &= MC_1; /停止计数TA1CTL &= BIT0; /清除中断标志char

4、 receive(void) /接受函数char tem,cnt=0; /临时变量用于存储接受数据while(cnt8)while(!(P2IN&BIT1); /等待50us的低电平结束DelayNus(45);if(P2IN&BIT1) /长于30us定义为1tem+;tem=1;while(P2IN&BIT1); /结束高电平elsetem=1;if(cnt!=7)while(!(P2IN&BIT1); /最后一次给函数返回留下时间cnt+;return tem;int dht11read( void ) /dht11温湿度读取函数，读取数据成功返回值1，不成功返回0，读取的数据保存在te

5、mph,templ,humdh,humdl,humd16,temp16中P2DIR|=BIT1;P2OUT|=BIT1;/1M clock-UCSCTL0 = 0x0000; / Set lowest possible DCOx, MODxUCSCTL1 = DCORSEL_2; / Select DCO range 2MHz operationUCSCTL2 = FLLD_1 | 31; / Set DCO Multiplier for 1MHz / (N + 1) * FLLRef = Fdco / (31 + 1) * 32768 = 1MHz / Set FLL Div = fDCOC

6、LK/2/1M clock-TA1CCTL0 &= CCIE; / CCR0 interrupt enabled-? i am not sure it is rightTA1CTL = TASSEL_2 | TACLR; / SMCLK, contmode, clear TARLOW;DelayNus(18000);HIGH;DelayNus(30);P2DIR&=BIT1;while(P2IN&BIT1);while(!(P2IN&BIT1);while(P2IN&BIT1);/Data comeshumdh=receive();humdl=receive();temph=receive()

7、;templ=receive();check=receive();cal=humdh+humdl+temph+templ;if(check=cal)temp16=templ+temph*256;humd16=humdl+humdh*256;return 1;elsetemp16=0;humd16=0;return 0;/-frequent read start-long int frequentread(void)freqvalue=0;count=0;freqmeasureenabled=1;P2DIR&=BIT4;TA1CCTL0 = CCIE; / CCR0 interrupt enab

8、ledTA1CCR0 = 60000;/8M clock-UCSCTL0 = 0x0000; / Set lowest possible DCOx, MODxUCSCTL1 = DCORSEL_5; / Select DCO range 16MHz operationUCSCTL2 = FLLD_1 | 243; / Set DCO Multiplier for 8MHz / (N + 1) * FLLRef = Fdco / (243 + 1) * 32768 = 8MHz / Set FLL Div = fDCOCLK/2/8M clock-TA1CTL = TASSEL_2 | MC_2

9、 | TACLR | ID_3; / SMCLK, contmode, clear TAR, 8-divider(0.2s time)_bis_SR_register(GIE); / Enter LPM0, enable interruptswhile(freqmeasureenabled)if(i=(P2IN&BIT4)i=!i;count=count+1;/1M clock-UCSCTL0 = 0x0000; / Set lowest possible DCOx, MODxUCSCTL1 = DCORSEL_2; / Select DCO range 2MHz operationUCSCT

10、L2 = FLLD_1 | 31; / Set DCO Multiplier for 1MHz / (N + 1) * FLLRef = Fdco / (31 + 1) * 32768 = 1MHz / Set FLL Div = fDCOCLK/2/1M clock-return freqvalue;/freqvalue=0;/-frequent read end-/-illu and soilresi read start-int illuread()/光照强度读取函数，函数直接返回光照强度int ii;P2DIR|=BIT2;ii=frequentread()/333;P2DIR &=

11、BIT2;return ii;int soilresiread()/土壤电阻率读取函数，函数直接返回土壤电阻率值int ii;P2DIR|=BIT3;ii=0.5*(1/(0.7*0.00001*frequentread()-1); /频率换算成电阻值 单位KOhmP2DIR &= BIT3;return ii;/-illu and soilresi read end-main()/int testsoilresivalue,testilluvalue,testhumdvalue,testtempvalue;WDTCTL=WDTPW+WDTHOLD;for(i=0;i5;i+)if(dht11read()=1)/testhumdvalue=humd16;/空气湿度值/testtempvalue=temp16;/空气温度值break;/testilluvalue=illuread();/光照强度值/testsoilresivalue=soilresiread();/土壤电阻率值单位：千欧姆/ Timer1 inter