#The 4th LiChuang Competition#Internet of Things--Air Temperature and Humidity Detector

Use 8266 as the main control, select dht11, ZPO1 and other sensors to build a low-cost, low-power intelligent temperature and humidity, air quality detector .
1. Work details
    esp8266 main control, dht11, ZPO1 sensors, HC-SR501 detects the human body to achieve low power mode, rgb lamp beads to achieve temperature and humidity, air quality display. It has a one-key network configuration function, which can display the current network connection status, and dynamic LED light strip control to achieve temperature and humidity, air quality visualization. The brightness of the light strip is controllable.
2. Describe the challenges faced by the work and the problems solved;
   In order to solve the communication between 8266 and the cloud server, and realize the control of mobile app, Blinker app and cloud server are used to realize the IoT function of this design. At the same time, Blinker provides various function functions of 8266 and data upload components, data display components, which greatly reduces the development cycle and cost.
    rgb lighting control, driver. The original plan used the MBI5020GP chip to achieve RGB lighting control, but found that the wiring was complicated, and it could only change 8 colors at most. The brightness adjustment also required the use of an additional potentiometer, which occupied a lot of IO ports. So the ws2812 RGB lamp beads were finally chosen. It is easy to drive, does not require additional chips, can achieve a maximum of 255^3 colors, and is convenient for brightness adjustment.
* 3. Describe the key points involved in the hardware and software parts of the work;
    the hardware chose 8266 as the main control chip, which is cheap and has excellent performance. It has its own wifi function, making it the only choice for low-cost IoT.
In terms of software, Arduino is used as a compiler, and the underlying functions of 8266 are repackaged, making the development of 8266 simpler and more convenient. At the same time, there are abundant libraries available for calling, so that developers do not have to pay too much attention to the underlying implementation. Focus on the overall logical function of the program.
* 4. Materials list;








1
ESP-12F(ESP8266MOD)
U1
WIFIM-SMD_ESP-12F-ESP8266MOD
1
ESP-12F(ESP8266MOD)
Ai-Thinker
LCSC
2
12k
R1,R2,R3,R4,R5,R7,R8
0603'
7



3
100nf
C1
0805'
1



4
100uF
C2
CASE-B_3528
1
TC212B107K006B
Sunlord
LCSC
5
CP2102-GMR
U2
QFN-28_5X5X05P
1
CP2102-GMR
SILICON LABS
LCSC
6
10uf
C3,C6,C7,C8,C10
0603'
5



7
100uf
C4,C5,C9
0603'
3



8
470
R6
0603'
1



9
S8050
Q1,Q2
SOT-23(SOT-23-3)
2
MMBT5551
CJ
LCSC
10
DC005-2.0MM
DC1
DC-5020
1
DC005-2.0MM
SOFNG
LCSC
11
AMS1117-3.3
U 3
SOT-223
1
AMS1117-3.3
AMS
LCSC
12
SS14
D1
SMA(DO-214AC)
1
SS14
Hottech
LCSC
13
MICRO5.9MMUSB
USB
MICRO-USB-SMD_5PIN-H-FEMALE-PITCH0.65-L_MICRO5.9MMUSB
1
MICRO5.9mmusb
SHOU HAN
LCSC
14
OLED
CN1
XH2.54-4AW
1
XH2.54-4AW
BOOMELE
LCSC
15
Air Quality
CN2
XH2.54-4AW
1
XH2.54-4AW
BOOMELE
LCSC
16
Sensing
CN3
XH2.54-4AW
1
XH2.54-4AW
BOOMELE
LCSC
17
DHT11
U4
DHT11
1
DHT11
Aosong (Guangzhou) Elec
LCSC
18
1u
C11
0603'
1



19
1k
R9
0603'
1



20
WS2812B-B
LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED8
LED-5050_4P
8
WS2812B-B
Worldsemi
LCSC
21
104
C12,C13,C14,C15,C16,C17,C18,C19
0603'
8



22
TSA363G25-250B
SW1,SW2
SW-SMD_2PIN-L6.15-W3.70-L
2
TSA363G25-250B
BRIGHT
LCSC
23
1k
R10,R11
0805 '
2.



  Upload pictures of your works; (The PCB must have the competition logo and a photo must be uploaded. If not, it will be deemed as giving up the competition)
   7. Open source documents.