The selected circuit in this week has the Arduino Wireless Meteorological Station, the Rissa Triaxial Aircraft Design, STM32 Development Board, WiFi-based smart watch, QR code recognition system design, etc., there is also a continuous display of electromagnet materials, USB Turn the TTL USB to the serial port, etc., of course, more good information in the Circuit City in addition to these materials!
TOP 10: Design based on STM32F407 QR code recognition system
This QR code & bar code recognition lib is provided by Alientek, which is convenient for everyone. Based on STM32F407ZET6 single-chip +2.8-inch TFT LCD + OV2640 camera module; supports QR QR code recognition; barcode identification of four encoding methods such as Code128, Code39, I25, EAN13; support UTF8-OEM conversion output (need customers to provide conversion code Table); Identification information is displayed on the LCD screen and output it to the computer serial port debugging hand by serial port.
https://www.cirmall.com/circuit/13759#/details
TOP 9: WiFi-based smart watch (using Google API)
I made a Bluetooth-based smart watch last year, but I have been playing the ESP-01 WiFi module a few months and is shocked by its ability. So I decided to make an internet clock based on it. Ok, this is easy, so I want to add more features, then one thing leads to another, and finally I have a watch that uses Google API to display our YouTube channel statistics and Instagram fans. In addition, it also has a notification server that allows it to use our applications we made on App Inventor to retrieve notifications from your smartphone.
https://www.cirmall.com/circuit/11731#/details
TOP 8: Share your own PCB package library (Altium Designer)
Including yourself in a few years, 3D shows, STM32 series has STM32F103C8, VE, ZE, F105VC, F107VC. In order not to increase trouble, directly open the "libpkg" project after decompression, the schematic package and the PCB package directly correspond to it, if the package is modified, the direct compilation project is good. In order to prevent errors, the 3D model is drawn in the machine 13 Layers, the method of adding 3D models is to open the package, switch to the mechanical layer, put the 3D body, after painting, you can change the color and height. The method of adding someone else's package is to open the PCB to select a component, copy, open your own package, click on the list, paste.
https://www.cirmall.com/circuit/3597#/details
TOP 7: STM32-based SX1278 transceiver + schematic, with SX1276 official website
The SX1276 / 78 transceiver mainly uses LORATM remote modem for super long distance spreading communication, strong anti-interference, and can minimize current consumption. With the LORATM patent modulation technique of Sundit, SX1276 / 77/78 uses low-cost crystals and materials to obtain high sensitivity of exceeding -148 dBm. In addition, the integration of high sensitivity and + 20dBM power amplifier makes the link budget of these devices reaches the industry leading level, making the best choice for long-distance transmission and high reliability requirements. Compared to traditional modulation technology, Loratm modulation technology also has a significant advantage in anti-blocking and selectivity, and solves the traditional design options that cannot be combined with distance, anti-interference and power consumption.
https://www.cirmall.com/circuit/6310#/details
TOP 6: (For a) Ultrasonic Rangeter - Reversing Radar Circuit (Schematic and PCB Source File)
The main body is an ultrasonic ranging, using a US-015 ultrasonic module, a maximum range 4M, a precision 0.01m, a DS18B20 temperature sensor as a temperature compensation element, a laser cross, used to locate the ranging target, as a reversing radar, When the distance is less than the set value, the sound is alarm. The entire circuit design is simple and can be implemented with a holeboard. The important circuit modules involved include: STC89C52RC microcontroller, power supply indicator module, 1602 liquid crystal display module, an acoustic alarm module, a DS18B20 temperature sensor module, a US-015 ultrasonic circuit module.
https://www.cirmall.com/circuit/2359#/details
TOP 5:14 level electromagnet circuit diagram, powerful steelmail (new version is about to update)
The electromagnetic main power supply partial circuit diagram, the control section is the same, each section MOS tube is discharged, the main is the parameter of the distance and the distance between the photoelectric switch. Push the object to be operated using electromagnetic force. Rapid moving effect of the object. This data can be 20 levels, usually the 14-level higher level speed is very difficult. Maximum 800m per second. Please do not hurt small animals with electromagnet. Children don't want to play!
https://www.cirmall.com/circuit/7464#/details
TOP 4: STM32 development board full set of information sharing (schematic, PCB source file, BOM, routine, burning, etc.)
This STM32 development board function and features: with USB one-click download circuit (PL2303HX); direct USB power supply. Double USB port, a serial port, one is a USB port; with the button battery holder, there is a selection pin, if there is no need to select 3.3V; boot0, using the switch setting, convenient. With JTAG Standard Cape Horn Interface. Self-ammage TF seat (SD mode); 485 interface (MAX485 chip); CAN interface (TJA1050 chip); part of IO leads, development ...
https://www.cirmall.com/circuit/4789#/details
TOP 3: USB turn TTL USB turn serial port DIY production (schematic + PCB + BOM + PL2303 driver)
This USB turn TTL module mainly adopts the PL2303HX chip, 28 foot patch SOIC package, operating frequency is 12MHz, in line with the USB 2.0 communication protocol, can directly convert USB signals into serial port signals, baud rate range from 75 ~ 1228800, 22 kinds of wave The special rate can be selected, and support 5, 6, 7, 8, 16 of 5 data ratios, this module passes multiple complex environment test verification performance stable, first open source all the schematic and PCB source files and BOM tables and PL2303 drivers It is convenient for the majority of industrial control and single-chip fans to make their own DIY.
https://www.cirmall.com/circuit/1905#/details
TOP 2: Renesa four-axis aircraft design (remote control board + main control board) all data open source
The four-axis aircraft changes the rotor speed by adjusting the four motor speeds to achieve changes in lift, thereby controlling the attitude and location of the aircraft. Structure, the flight mode of using the four-axis aircraft in this application is X mode, as shown, four motor of the four-axis aircraft, one pair of reverses, make the counter-torque balance in the vertical direction, thereby ensuring The stability of the flight. The four-axis aircraft can be used as aerial photography, toys, etc., which is increasingly common in our lives.
https://www.cirmall.com/circuit/4278#/details
TOP 1: DIY Guide, Diy Arduino Wireless Meteorological Station (Schematic, PCB and Source)
In this DIY guide, I will show you how to make my own wireless weather station. In this project, I decided to make my own Arduino UNO microcontroller PCB - Atmega328p.
https://www.cirmall.com/circuit/13795#/details
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