電路原理圖如下：
R3是DA，R4過流保護，R5是采樣電阻，接AD
單片機源程序如下:
- #include "sys.h"
- #include "delay.h"
- #include "usart.h"
- #include "led.h"
- #include "lcd.h"
- #include "adc.h"
- #include "dac.h"
- #include "key.h"
- int main(void)
- {
- u16 adcx;
- float temp;
- u8 t=0;
- u16 dacval=3300;
- u8 key;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設置系統中斷優先級分組2
- delay_init(168); //初始化延時函數
- uart_init(115200); //初始化串口波特率為115200
-
- LED_Init(); //初始化LED PD.12
- Adc_Init(); //adc初始化 PA.5
- KEY_Init(); //按鍵初始化
- Dac1_Init(); //DAC通道1初始化 PA.4
- DAC_SetChannel1Data(DAC_Align_12b_R,dacval);//初始值為0
-
- while(1)
- {
- //GPIO_SetBits(GPIOD,GPIO_Pin_2);
- //程控輸出
- if(KEY==1)
- {
- //LED=!LED;
- if(dacval>1500)
- dacval-=200;
- else if(dacval==1500)
- dacval=3300;
- delay_ms(500);
- }
- Dac1_Set_Vol(dacval);
- adcx=Get_Adc_Average(ADC_Channel_5,10); //得到ADC轉換值
- temp=(float)adcx*(3.3/4095); //得到ADC電壓值*/
- if (temp >= 0.75)
- {
- GPIO_ResetBits(GPIOD,GPIO_Pin_2);
- }
- else
- {
- GPIO_SetBits(GPIOD,GPIO_Pin_2);
- }
- }
- }
- /*ADC用法
- adcx=Get_Adc_Average(ADC_Channel_5,10); //得到ADC轉換值
- temp=(float)adcx*(3.3/4096); //得到ADC電壓值*/
- /*DAC用法
- DAC_SetChannel1Data(DAC_Align_12b_R, dacval);//設置DAC值
所有資料51hei提供下載:
DC POWER_guo.7z
(304.6 KB, 下載次數: 124)