Design of environment detection system based on STM32 and Alibaba cloud

One 、 Main functions

1、STM32 Collection temperature and humidity , The concentration of carbon dioxide is local OLED Data display
2、STM32 Send data to through serial port ESP8266, Then upload the data to Alibaba cloud
3、 mobile phone app View data remotely + Open state of remote control switch
4、 When the temperature is higher than the set threshold, the buzzer will alarm （ Press the key to adjust the threshold change ）
5、 You can try to join again web display

Two 、PCB Design

3、 ... and 、 Main chips and sensors

1、STM32F103ZET6 chip
2、ESP8266（ESP-01）- Connect to alicloud
3、DHT11
4、 Three in one gas sensor （ Carbon dioxide concentration / Formaldehyde concentration /xxx） Sensor link
5、 Buzzer
6、0.96 " OLED screen

Four 、 What happened ：

As the course ends, it needs , First try Sketchpad , There are inevitably some flaws and problems , But the board can be used normally
1、 The buzzer circuit can be modified （ In the video, I connected an external buzzer ）
2、usb Download problem （micro USB You can change that type-c The interface is encapsulated with that usb Power supply , Convenient welding ）- You can also directly do not weld
3、 In fact, there is no need USB（ Pick up ch340 chip ） Download program , Use it directly ST-link Class simulator to download the program
4、OLED The connector can be directly welded to the busbar , As a result of careless welding into a row of needles , So I used DuPont cable to connect

Four 、 Final demonstration + Wiring video

The video was repeated by myself , No rehearsal , No mobile phone holder , So the effect is average

Demo video

stm32pcb connection + Demo video

5、 ... and 、pcb+ Code file link

pcb Engineering documents + Code sharing is as follows ：

pcb Project download link

Code link