DS18B20+HC05+MSP430
时间: 2023-12-26 18:28:48 浏览: 118
DS18B20是一种数字温度传感器,它可以通过单线接口与微处理器进行双向通信。HC05是一种蓝牙模块,可以实现无线通信。MSP430是一种低功耗微控制器。结合这三个元件,可以实现无线温度监测系统。
下面是一个简单的示例代码,演示了如何使用DS18B20、HC05和MSP430来实现无线温度监测系统:
```c
#include <msp430.h>
#include <stdint.h>
#define DS18B20_PIN BIT0
#define HC05_RX_PIN BIT1
#define HC05_TX_PIN BIT2
void delay_us(uint16_t us) {
while (us--) {
__delay_cycles(1);
}
}
void ds18b20_init() {
P1DIR |= DS18B20_PIN;
P1OUT &= ~DS18B20_PIN;
delay_us(480);
P1DIR &= ~DS18B20_PIN; delay_us(60);
if (!(P1IN & DS18B20_PIN)) {
delay_us(420);
}
while (P1IN & DS18B20_PIN);
}
void ds18b20_write_bit(uint8_t bit) {
P1DIR |= DS18B20_PIN;
P1OUT &= ~DS18B20_PIN;
delay_us(2); if (bit) {
P1DIR &= ~DS18B20_PIN;
}
delay_us(60);
P1DIR &= ~DS18B20_PIN;
}
uint8_t ds18b20_read_bit() {
uint8_t bit = 0;
P1DIR |= DS18B20_PIN;
P1OUT &= ~DS18B20_PIN;
delay_us(2);
P1DIR &= ~DS18B20_PIN;
delay_us(8);
if (P1IN & DS18B20_PIN) {
bit = 1;
}
delay_us(50);
return bit;
}
void ds18b20_write_byte(uint8_t byte) {
for (uint8_t i = 0; i < 8; i++) {
ds18b20_write_bit(byte & 0x01);
byte >>= 1;
}
}
uint8_t ds18b20_read_byte() {
uint8_t byte = 0;
for (uint8_t i = 0; i < 8; i++) {
byte >>= 1;
byte |= (ds18b20_read_bit() << 7);
}
return byte;
}
void hc05_init() {
P1SEL |= HC05_RX_PIN | HC05_TX_PIN;
P1SEL2 |= HC05_RX_PIN | HC05_TX_PIN;
UCA0CTL1 |= UCSSEL_2;
UCA0BR0 = 104;
UCA0BR1 = 0;
UCA0MCTL = UCBRS0;
UCA0CTL1 &= ~UCSWRST;
}
void hc05_send_byte(uint8_t byte) {
while (!(IFG2 & UCA0TXIFG));
UCA0TXBUF = byte;
}
void hc05_send_string(const char* string) {
while (*string) {
hc05_send_byte(*string++);
}
}
void hc05_send_temperature(uint8_t temperature) {
hc05_send_string("Temperature: ");
hc05_send_byte(temperature);
hc05_send_string(" degrees Celsius\r\n");
}
void main(void) {
WDTCTL = WDTPW + WDTHOLD;
ds18b20_init();
hc05_init();
while (1) {
ds18b20_write_byte(0xCC);
ds18b20_write_byte(0x44);
__delay_cycles(1000000);
ds18b20_init();
ds18b20_write_byte(0xCC);
ds18b20_write_byte(0xBE);
uint8_t temperature = ds18b20_read_byte();
hc05_send_temperature(temperature);
__delay_cycles(1000000);
}
}
```
这段代码使用MSP430的GPIO控制DS18B20进行温度读取,并通过HC05模块将温度值发送到蓝牙设备。你可以根据实际情况进行修改和扩展。
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