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Collect indoor and outdoor temperature and humidity data through arduino, and transmit the collected data to raspberry pie in the form of json data through serial port. There is a service in raspberry pie to obtain the data from serial port and write the data into rrd file. Make another script on the raspberry pie, generate graphics every 5 m ...

Recently, a classmate came to me because his graduation project was about to be concluded. His project was to make a car that could recognize the QR code and realize ranging. At the same time, he also hoped that the car would keep a constant distance from the QR code. That is, when the QR code approaches the car, the car will retreat, and when ...

Three ways of using Arduino to read PWM signal of RC receiver Note: Recently, the static change of the playing model requires the use of a 2.4Ghz RC controller to control arduino. I found an article on using Arduino to process PWM signal on the Internet. I think it's good. I hope it can help Tonghao. (translation and summary) https://www.benri ...

In the previous section, Arduino+ESP32 drives the GC9A01 circular LCD (one), We've already ported the arduino GFX library, which includes sample programs for LVGL as well.   Porting lvgl in arduino is very convenient. Let's transplant one together and run the demo example of lvgl! Since the Arduino project file in arduino's library path is rea ...

1, Experimental purpose (1) master the function of 1-bit nixie tube module; (2) be familiar with the function of 4-digit nixie tube module; (3) 4-digit digital timing display function programming 2, Experimental equipment and environment Arduino UNO kit, Arduino IDE, computer, 1-bit nixie tube, 4-bit nixie tube, 4 220 ohm current limiting ...

Background knowledge: ESP32 There are two ways to use SD card. One is to use SPI interface to access SD card, and the other is to use SDMMC interface to access SD card. In Arduino core for the ESP32, SPI mode occupies 4 IO ports and SDMMC mode occupies 6 IO ports. Generally speaking, SDMMC mode is faster than SPI mode.   1. SDMMC mode Although ...

1. Serial communication The fifth function of single chip microcomputer - serial communication. It can establish a direct connection between your computer and single chip microcomputer, or the connection of other modules, such as Bluetooth, WIFI, etc. the interfaces are serial ports. The interfaces of other modules are IIC or SPI. For example, ...

prefaceRecently, I was studying the COAP protocol and found a COAP simple library that can be used on ESP32 when trying to use the COAP protocol. Although the library is not perfect, the part about loop processing should not be completed, but it is easier for friends who contact COAP for the first time to understand and learn. Friends who need ...

Catalog 1. Serial communication 2.IIC The fifth function of single-chip computer - serial communication, which can establish a direct connection between your computer and single-chip computer, can also be the connection of other modules, such as Bluetooth, WIFI, etc. Interface is a serial port, the other part of the module, interface IIC ...

prefaceI was here a few months ago DIY smart home from scratch - intelligent light sensor based on ESP32_ Inspired desktop blog - CSDN blog A pit was buried in the. Now I'm back to fill it! This time I'll finish the scene of remote light control (secretly tell you, I secretly dug a bigger hole). Now you can really turn on and off the lights aut ...