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DS1302 RTC Real Time Clock Module with CR2032 battery for Arduino UK FAST

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Interfacing the DS1302 with a microprocessor is simplified by using synchronous serial communication. Only three wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (se...
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About Arduino Batteries

You aren't necessarily a geek because you can programme the Arduino Uno microcontroller, but you are wise to purchase an Arduino battery on eBay to attach to the board's power connector in order to use the motherboard. Artists, designers, and others use the Arduino to control lights, sensors, and other devices which interact electronically. Buyers purchase a 9-volt battery adapter connected to a 2.1 mm or larger DC power cable, or buy a plastic battery holder box that the 9-volt battery fits into, protecting the battery and its connection with a power cable attached to the battery box. A third way to get power to the Arduino is to purchase a 9-volt adapter with power leads that insert into the pin headers of the power connector, commonly seen on robots. Let your creative side run wild, but you won't power up the controller until you first purchase an Arduino battery assembly in one of the configurations on hand.