【LPC824lite】PM粉尘检测

lkl0305 · 发表于 2016-11-23 23:18:51

去年花钱淘了一个粉尘传感器PMS1003，攀藤的产品。

这几天又拿出来玩玩，使用LPC824读取一下数据，检测PM1.0、PM2.5和PM10的值。

这次先上个效果
QQ截图20161123230140.jpg

这个激光PM检测器精度比几十元的要好
QQ截图20161123225552.jpg

PMS1003的结构，采用激光传感器
QQ截图20161123214649.jpg

引脚8个

攀藤公司除了一些列的多个产品
QQ截图20161123215224.jpg

PMS1003的参数，通过这个表也可以看到精度
QQ截图20161123215336.jpg

这个传感器一点好处就是不用A/D之类的，直接输出串口数据
起协议如下：只需要配合该协议串口读取数据就可以了
QQ截图20161123215633.jpg

看看我的测试硬件，由于UART1作为串口调试接口，所以选择UART0读取传感器数据，通过开关矩阵接到P0.18和P0.19上
QQ截图20161123215933.jpg

定义需要用到的变量

串口0初始化，启动接收中断，9600bps
QQ截图20161123225622.jpg

中断函数，按照上面的协议读取数据
QQ截图20161123225636.jpg

主函数输出检测数据

下载调试即可

下面分享一下我的程序，有这个模块的朋友也可以试试：

/*
===============================================================================
Name : 005_lpc_pms1003.c
Author : $(lkl0305)
Version : 1.0
Copyright : $(lkl0305)
Description : main definition
===============================================================================
*/
#if defined (__USE_LPCOPEN)
#if defined(NO_BOARD_LIB)
#include "chip.h"
#else
#include "board.h"
#endif
#endif
#include <cr_section_macros.h>
// TODO: insert other include files here
// TODO: insert other definitions and declarations here
#define PMS1003_BUFFER_SIZE 32
typedef struct pms1003_data
{
uint16_t pm1_0_Value;
uint16_t pm2_5_Value;
uint16_t pm10_Value;
} pms1003_data_t;
volatile uint8_t pms1003_Flag = 0;
pms1003_data_t pms1003_Data = {0};
void Uart0_Init(void)
{
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
Chip_SWM_DisableFixedPin(SWM_FIXED_ADC7);
Chip_SWM_DisableFixedPin(SWM_FIXED_ADC8);
Chip_Clock_SetUARTClockDiv(1);
Chip_SWM_MovablePinAssign(SWM_U0_TXD_O, 18);
Chip_SWM_MovablePinAssign(SWM_U0_RXD_I, 19);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);
Chip_UART_Init(LPC_USART0);
Chip_UART_ConfigData(LPC_USART0, UART_CFG_DATALEN_8 | UART_CFG_PARITY_NONE | UART_CFG_STOPLEN_1);
Chip_Clock_SetUSARTNBaseClockRate((115200 * 6 * 16), true);
Chip_UART_SetBaud(LPC_USART0, 9600);
Chip_UART_Enable(LPC_USART0);
Chip_UART_TXEnable(LPC_USART0);
Chip_UART_IntEnable(LPC_USART0, UART_INTEN_RXRDY);
NVIC_EnableIRQ(UART0_IRQn);
}
void UART0_IRQHandler(void)
{
static uint8_t pms1003_Value[PMS1003_BUFFER_SIZE] = {0};
static volatile uint8_t pms1003_Status = 0;
uint8_t data;
if ((Chip_UART_GetStatus(LPC_USART0) & UART_STAT_RXRDY) != 0)
{
data = Chip_UART_ReadByte(LPC_USART0);
switch (pms1003_Status)
{
case 0:
if (data == 0x42)
{
pms1003_Value[pms1003_Status] = data;
pms1003_Status++;
}
break;
case 1:
if (data == 0x4d)
{
pms1003_Value[pms1003_Status] = data;
pms1003_Status++;
}
else
{
pms1003_Status = 0;
}
break;
default:
pms1003_Value[pms1003_Status] = data;
pms1003_Status++;
if (pms1003_Status == PMS1003_BUFFER_SIZE)
{
pms1003_Status = 0;
uint16_t crc_Value = 0;
for (uint8_t i = 0; i < 30; i++)
{
crc_Value += pms1003_Value[i];
}
if (crc_Value == ((uint16_t)pms1003_Value[30] << 8) + pms1003_Value[31])
{
pms1003_Data.pm1_0_Value = ((uint16_t)pms1003_Value[10] << 8) + pms1003_Value[11];
pms1003_Data.pm2_5_Value = ((uint16_t)pms1003_Value[12] << 8) + pms1003_Value[13];
pms1003_Data.pm10_Value = ((uint16_t)pms1003_Value[14] << 8) + pms1003_Value[15];
pms1003_Flag = 1;
}
}
break;
}
}
}
int main(void) {
#if defined (__USE_LPCOPEN)
// Read clock settings and update SystemCoreClock variable
SystemCoreClockUpdate();
#if !defined(NO_BOARD_LIB)
// Set up and initialize all required blocks and
// functions related to the board hardware
Board_Init();
// Set the LED to the state of "On"
Board_LED_Set(0, true);
#endif
#endif
// TODO: insert code here
Uart0_Init();
// Force the counter to be placed into memory
// Enter an infinite loop, just incrementing a counter
while(1) {
if (pms1003_Flag == 1)
{
pms1003_Flag = 0;
DEBUGOUT("\r\n=======================\r\n");
DEBUGOUT("PM1.0 = %d ug/m3\r\n", pms1003_Data.pm1_0_Value);
DEBUGOUT("PM2.5 = %d ug/m3\r\n", pms1003_Data.pm2_5_Value);
DEBUGOUT("PM10 = %d ug/m3\r\n", pms1003_Data.pm10_Value);
DEBUGOUT("=======================\r\n");
}
}
return 0 ;
}