This application function is divided into three parts: temperature monitoring, humidity monitoring, and light monitoring. After startup, there will be a boot interface first. After a moment, you will enter the main function interface. In this interface, we can select the monitoring items, such as temperature, humidity, and illumination. There will be a text box under the temperature monitoring interface to display the temperature data transmitted from esp32, a "start" button, and a "stop" button to start and stop the temperature monitoring. If you want to exit the interface, you can select the "return" button; the second item is humidity monitoring, and there is also a text box under this interface for displaying esp 32. For the humidity data transmitted, the "start" and "stop" buttons are used to start and stop monitoring, and a return button is used to exit the current interface. The third item is light intensity monitoring. Different from the previous two functions, counting is used here, and one is added every time there is light.
Related devices
1. DHT11 * 1；
2. Photosensitive resistance sensor * 1;
3. DuPont line * 8;
4. Esp32 module * 1;
5. STONE TFT LCD screen * 1.
Information interaction between STONE HMI and esp32
1. The serial port screen of STONE HMI realizes the function of the button switching interface;
2. STONE HMI serial port screen can automatically jump to the main interface after startup;
3. The serial port screen of STONE HMI realizes variable display function;
4. The serial port screen of STONE HMI realizes data variable distribution;
Esp32 peripheral control
1. Esp32 realizes the data acquisition and analysis of photosensitive resistance sensor;
2. Esp32 realizes the data adoption and analysis of DHT11 temperature and humidity sensor;
3. Esp32 can upload valid data to the TFT LCD screen.
Brief schematic diagram of the project:
Temperature and humidity sensor
The DHT11 temperature sensor I use can monitor the temperature and humidity of the surrounding environment. The working voltage is 3.3V ~ 5V, and the signal output form is a digital output. It is suitable for this project, but it is difficult to develop.
Photosensitive sensor
This time, the sensitive photosensitive resistance sensor is used, and the comparator output is used. The signal is clean, the waveform is good, and the driving capacity is more than 15mA. The same working voltage is 3.3V and 5V. There are analog signal output and digital signal output respectively. It is very convenient to develop. When the ambient light brightness can not reach the set threshold, the do terminal outputs a high level, and when the ambient light brightness exceeds the set threshold value Do output a low level.
ESP32
Esp32 is a general-purpose wifi-bt-BLE MCU module with powerful functions and wide applications. It can be used in low-power sensor networks and demanding tasks, such as voice coding, audio streaming, and MP3 decoding. It also integrates a wealth of peripherals, including a capacitive touch sensor, Hall sensor, low noise sensor amplifier, SD card interface, Ethernet-interface, high-speed SDIO / SPI, UART, I2S, and I2C. It can achieve a maximum range of wireless communication. It has the best performance in high integration, wireless transmission distance, power consumption, and network connectivity.
STVC101WT-01
STVC101WT-01 module communicates with MCU through the serial port, which needs to be used in this project. We only need to add the designed UI picture through the upper computer through the menu bar options to buttons, text boxes, background pictures, and page logic, then generate the configuration file, and finally download it to the display screen to run.
GUI design
Code
Code: Select all
if(Serial.available() != 0)
{
for(cout_i = 0; cout_i < 9; cout_i ++)
{
RecievedTemp[cout_i] = Serial.read();
}
switch(RecievedTemp[5])
{
case 0x0D://Temperature start
TemperatureBool = true;
break;
case 0x0E://Temperature stop
TemperatureBool = false;
TemperatureOutput[6] = 0;
TemperatureOutput[7] = 0;
Serial.write(TemperatureOutput, 8);
break;
case 0x0F://Temperature back
TemperatureBool = false;
break;
case 0x11://Humidity start
HumidityBool = true;
break;
case 0x12://Humidity stop
HumidityBool = false;
HumidityValue = 0;
HumidityOutput[7] = HumidityValue;
Serial.write(HumidityOutput, 8);
break;
case 0x10://Humidity back
HumidityBool = false;
break;
case 0x14://illumination start
illuminationBool = true;
illuminationState = false;
break;
The result
