【IoT Smart Home System】---Temperature and humidity data collection and upload (1)

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【IoT Smart Home System】---Temperature and humidity data collection and upload (1) [Copy link]

 

The host of this system uses STM32F429ZIT6. Select CubeMx for hardware configuration on the development tool and use Keil for compilation and download.

Today I would like to share my progress since I received the development board one month ago.

(1) Perform a simple test under the FreeRTOS operating system

For the 429I-DISC1 official development board, CubeMx has already been configured and can be used directly.

LED light test: Create an LED light flashing task

Serial port test: create a serial port printing task

During serial port debugging, you need to pay attention to two issues

First point add header file #include "stdio.h" in usart.c

Use the HAL library to implement the Fputc function and the Fgetc function respectively

Second point: Open Use MicroLIB

(2) Use the DHT11 sensor to obtain temperature and humidity data

The acquisition principle of the sensor DHT11 will not be introduced here.

The key issue is that DHT11 needs to use millisecond-level delays when acquiring data.

Using Timer 2 to create a microsecond delay function

Change the serial port test task to print temperature and humidity data

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What method are you going to use to upload? Looking forward to an excellent solution.