RTC, real-time clock, provides accurate time reference for electronic systems, especially those without network connection, by using the vibration of crystal oscillator as reference frequency. If the RTC chip works when the main power is cut off, additional battery power is required. ↓
For simple electronic projects, RTC enables more accurate data processing. For example, it is easy to tell when came the sharp changes in temperature, at night? Or at noon. Send the feeding signal every 4 hours from dawn to early night every day, to realize more intelligent pet feeding operation.
RTC Card is based on the DS1307 chip, which supports the I2C protocol. The card requires a Lithium cell battery (CR1225) to operate a long period continuously. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The card requires to insert 3V CR1225 lithium cell battery into the battery holder.
Longan Cards is a unique open-source development platform designed by Longan Labs. As a plug and play development tool, Longan Cards allows you to quickly build wide array of prototypes and applications in no time. A full set of Arduino libraries and plenty of example codes are available to play with Longan Cards system.
↑ Longan Cards system consists of Cards and Boards. There are many gold finger antennas on Card and several gold finger sockets on Board. They are combined together through sockets interpolation, which is intuitive and easy to use. With this unified and flexible interface, you can realize a variety of ideas. Many more Boards with different themes would luanch to help people explore more fun.
↑ Longan Cards modules are classified into many types. Firstly, the main control cards which are the heart of Cards system, run the code and take charge of the exchange of data between modules. Besides Carduino, you can also use MicroBit, Arduino and other development board through connection board. The sensor cards can detect data of surrounding such as temperature and air pressure, etc. The inputs cards allows you to do some operations, such as buttons, knobs, etc. The output cards give feedback in various forms, such as buzzers, motor drives, etc. The communication cards can transmit data in many ways, such as Bluetooth and 4G network. The power cards supply power for electronic projects, including batteries, DC, etc. And other cards, mainly do some auxiliary work, such as expansion, code downloading, etc.
↑ STEM is an acronym for science, technology, engineering, and math. STEM education began in the United States in the 1990s. It is an interdisciplinary teaching method that combines STEM content and real life situations, which helps stimulate students’ original curiosity and thirst for knowledge and novelty. Longan Cards contains dozens of modules, involving a wide range of knowledge in the process of use, including electronic circuit, mechanical structurenature, programming, science of nature, daily wisdom, and humanities, etc. It is a powerful tool for STEM education at fields of electronic prototyping, science experimentation and DIY project.