The RTC module is specifically designed for Raspberry Pi. It communicated with Raspberry Pi through I2C bus. There is a Maxim DS1307 and CR1220 button cell on the board to keep the real time for a long time after the Raspberry Pi has its power down. Set a serial port, TTL convenient way online debugging.
Have you ever want to DIY an Aquarium controllers to help you Changing the water for the fish tank. This mini pump really sucks! This pump operates at 3V~9V and has enough suction for most small projects. Use this pump to make a fountain or waterfall, even water your plants!
“An open-source firmware and development kit that helps you to prototype your IOT product within a few Lua script lines” Based on ESP8266 ESP12E wifi board, on-board USB-TTL support directly flashing from USB port, also on-board power circuits and all IOs setup.
This is a light weight, high energy density polymer lithium battery. It outputs a nominal 3.7v at 980mAh, including built-in protection against over voltage, over current, and minimum voltage. It comes terminated with a standard 2-pin JST connector-2.54 mm spacing between pins. Please do not attempt to charge these with anything but a specialized Lithium...