PT1000 是一种热电阻,其电阻值随温度的变化呈线性关系。以下是一些关于如何编程PT1000的方法:
1. 使用C语言编程
示例代码
```c
include "bsp_adc.h"
define ADC1_DR_Address ((u32)0x40012400+0x4c)
__IO uint16_t ADC_ConvertedValue; //__IO u16 ADC_ConvertedValueLocal;
void ADC1_GPIO_Config(void) {
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable DMA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable ADC1 and GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC, ENABLE);
/* Configure PC.0 as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void ADC1_Init(void) {
ADC_InitTypeDef ADC_InitStructure;
ADC_InitStructure.ADC_Mode = ADC_Mode_Continuous;
ADC_InitStructure.ADC_ScanConvMode = ADC_ScanConvMode_Single;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
}
u16 Read_ADC1(void) {
return ADC_ConvertedValue;
}
float Read_PT1000_Temperature(void) {
u16 adc_value = Read_ADC1();
// Convert ADC value to resistance value
// This is a simplified example, actual conversion may require calibration and handling of non-linearities
float resistance = (float)adc_value * 3.3 / 4096; // Convert 12-bit ADC value to Ohms
// Use lookup table to convert resistance to temperature
float temperature = 0.0;
for (int i = 0; i < 100; i++) {
if (resistance >= pt1000_table[i].resistance) {
temperature = pt1000_table[i].temperature;
break;
}
}
return temperature;
}
int main(void) {
ADC1_GPIO_Config();
ADC1_Init();
while (1) {
float temperature = Read_PT1000_Temperature();
printf("Temperature: %.2f°C\n", temperature);
// Add delay or other processing as needed
}
return 0;
}
```
2. 使用PLC编程语言
示例代码