• Use ESP8266-12F as the main control, no need for other MCU, reducing costs
• The onboard MICRO-USB interface can be used for power supply and downloading (USB-TTL circuit)
• There is a dht11 interface onboard to obtain temperature and humidity
• An onboard infrared obstacle avoidance module interface is used to sense whether a hand has been scanned
• Onboard a photosensitive circuit
• An onboard OLED interface is used to display the acquired temperature, humidity and light.
• Onboard relay
• Onboard four-way LED (three-way indication and one power supply)
• Two buttons (one FLASH for downloading and network configuration and one RESET)
• Some IO port leads can be used as a development board for learning

4. Hardware selection:

ESP8266-12F:

• ESP8266 integrates the industry-leading Tensilica L106 ultra-low power 32-bit micro MCU in a smaller size package, with 16-bit reduced mode, main frequency supports 80 MHz and 160 MHz, supports RTOS, and integrates Wi-Fi MAC/ BB/ RF/PA/LNA.
• The ESP-12F Wi-Fi module supports the standard IEEE802.11 b/g/n protocol and the complete TCP/IP protocol stack. You can use this module to add networking capabilities to existing devices or build a standalone network controller.
• Built-in 1 channel 10 bit high-precision ADC
• Support UART/GPIO/ADC/PWM/SPI/I2C interface
• Serial port speed up to 4Mbps
• Supports Android and IOS Smart Config (APP)/AirKiss (WeChat) one-click network configuration (can meet project requirements)
• 9 available IOs, 1 10bit ADC

CH340E:

Full-speed USB device interface, compatible with USB V2.0

Built-in clock, no external crystal oscillator required

0.96OLED：** **

IIC interface is simple to use and provides user data interface

dht11 module:** **

Can measure temperature and humidity at the same time one-wire communication protocol

Temperature and humidity sensor with calibrated digital signal output.

Its accuracy humidity is +-5%RH, temperature is +-2℃, measuring range humidity is 20-90%RH, and temperature is 0~50℃.

Infrared obstacle avoidance module:

The module used to make the obstacle avoidance car was added by the way.

5. Process records :

**update 8/13 **

I received the board in the morning and started soldering. I found that the direction of the DHT11 and infrared module interfaces was not very good and blocked the photoresistor, but it did not affect the use (the PCB has been modified)

The first time welding MICRO-USB was a bit challenging and I broke two boards (I learned a lesson: don’t be stingy with the rosin, just put it in as hard as you can)

When welding CH340E for the first time, be sure to pay attention to the chip direction. Be sure to pay attention to the chip direction. Be sure to pay attention to the chip direction.

There is a small spot on the package. I'm going to solder it now.

I started writing programs in the afternoon. I had watched Ji Xiaoxin’s ESP8266 tutorial and originally planned to use the AIthinker development environment.

Who knew that the live broadcaster Song Gong kept saying, kept saying, yes, kept saying that this software is outdated and should not be used anymore. It made me panic. Okay, I will use this one last time (I don’t know how to use other environments. It’s too late to learn other things. , it’s up to you, Bulbasaur~)

Happy COPY codes are always short-lived projects that require smart devices to control the Internet of Things system through a server. The first thing that comes to mind is Alibaba Cloud, but Ji Xiaoxin did not tell me how to configure a network connection with one click (no need to enter wifi in the code Name and password smartconfig/airkiss) But I have WeChat configuration network, but it feels a bit troublesome (I’m afraid I can’t do it well) PASS

After careful consideration (in fact, I found a platform that doesn’t even use COPY), I chose Gizwits Cloud to generate code with one click.

The process is as follows:

1. Enter the Developer Center (you need to simply register for the first time, it is very simple so I won’t go into details)

2. Create new products

3. Create new data points

4. Automatically generate code

For the modification of the code, please see the video posted by the UP host of station B (the video is STM32, but the principle is the same):

https://www.bilibili.com/video/BV1ji4y1t7Ai

update 8/14

**Added some design features to the generated code **

1. The hand sweep controls the on and off of the relay: It is implemented using the interrupt method, and the falling edge interrupts. Each time the hand sweeps over the infrared obstacle avoidance module, the signal pin level changes from high to low, and the relay on and off is controlled in the interrupt callback function. break

2. ADC reading: This is very simple and can be implemented by directly calling the built-in api interface.

3. DHT11 measures temperature and humidity, which is COPYed from the Gizwits routine. It can be eaten directly and is very fragrant.

4. OLED display: IIC protocol and OLED code technology have direct COPY. I have added some Chinese character library Chinese characters and digital display functions.

We are afraid of affecting the underlying communication protocol (after all, we don’t understand the automatically generated things, so if it doesn’t affect it, it won’t). Here we use a software timer setting (functions executed in a task can be delayed by other high-priority tasks) and follow up every five seconds. New OLED screen data,

The last time I used AIthinker, I had mixed emotions. I felt like I had lost my girlfriend (it’s better to cheer yourself up, never be discouraged, if the old ones don’t go, the new ones won’t come~)

6. Layout and routing design