(资料图)

英飞凌PSoC62是一款Cortex-M0+与Cortex-M4的双内核MCU，其有着非常优秀的超低功耗性能。

温度计的器材

英飞凌PSoC62开发板 这是一款英飞凌与RT-Thread联合制作的一款开发板。瑞萨的hs3003温湿度传感器电子墨水屏

选型原因

以上三款都具休有超过功耗性能

程序代码

本次的代码是基于RT-Thread Studio创建的。电子墨水屏是移植微雪的标准例程。这里不过多介绍。hs3003是利用rtt软件包的模块创建。低耗实现的代码，MCU利用Cortex-M0+的标准进入深度睡眠模式。然后用RTC的ALARM中断来唤醒。设置的唤醒程序如下：

void set_rtc_alarm_date_time(void){    cy_rslt_t result;    /* Print the RTC alarm time by UART*/    //LOG_D("RTC alarm will be generated after 10 seconds\\r\\n");    /* Set the RTC alarm for the specified number of seconds in the future by editing the macro(USE_SECONDS_FOR_ALARM) */    result = cyhal_rtc_set_alarm_by_seconds(&rtc_obj, USE_SECONDS_FOR_ALARM);    if (result != CY_RSLT_SUCCESS)    {        rt_kprintf("RTC alarm err \\r\\n");    }}

5、主程序代码：

int main(void){    cy_rslt_t result;    float temp, humi;    uint8_t show_str[20] = {0};    EPD_GPIO_Init();       //EPD GPIO  initialization    //Cy_SysDisableCM4();    __enable_irq();    rt_pin_mode(LED_PIN, PIN_MODE_OUTPUT);  //  rt_thread_mdelay(500);    Paint_NewImage(BlackImage, 128, 296, 270, WHITE); //Set screen size and display orientation    Paint_SelectImage(BlackImage);//Set the virtual canvas data storage location    Paint_NewImage(BlackImage, EPD_WIDTH, EPD_HEIGHT, 270, WHITE); //Set screen size and display orientation    Paint_SelectImage(BlackImage);//Set the virtual canvas data storage location    EPD_DeepSleep();    /* Initialize RTC */    cyhal_rtc_enable_event(&rtc_obj, CYHAL_RTC_ALARM, RTC_INTERRUPT_PRIORITY, true);    set_rtc_alarm_date_time();    for (;;)    {      //  cyhal_system_delay_ms(LONG_GLITCH_DELAY_MS);        /* Set MYPIN_0_NUM to AnalogHI-Z for low power using HAL APIs. *///        /* Go to deep sleep */        cyhal_syspm_deepsleep();        set_rtc_alarm_date_time(); //       rt_kprintf("Wack from sleep!\\r\\n");        hs300x_read_data(&temp_humi_dev, &humi, &temp);        EPD_HW_Init(); //Electronic paper initialization        EPD_HW_Init_GUI(); //EPD init GUI        Paint_Clear(WHITE);        sprintf(show_str,"温度%02d.%02d℃",(int)temp, (int)(temp*100)%100);        Paint_DrawString_CN(40,0,show_str, &Font24CN, WHITE, BLACK);        sprintf(show_str,"湿度%02d.%02d%%",(int)humi, (int)(humi*100)%100);        Paint_DrawString_CN(40,40,show_str, &Font24CN, WHITE, BLACK);        EPD_Display(BlackImage); //display image        EPD_DeepSleep();//EPD_DeepSleep,Sleep instruction is necessary, please do not delete!!!    }}

实验的效果

经调试休眠模式下，整体的待机电流低到450uA：

工作电流为19mA:

总结

目前待机电流基本上达到电池供电的效果，后期再加上NB-IoT的数据传输模式。https://www.bilibili.com/video/BV1bP411X7vP/?pop_share=1