The AC5EC board contains a microcontroller, two EEPROM modules, a clock and calendar module, two crystal oscillators, and several SMD-sized resistors, capacitors, and LEDs. In addition, it includes headers for connecting peripherals to the microcontroller. All this is done, on a relatively small board, measuring 44x28 mm. The Atmega328P-PU MCU is in the center of the board. The headers and the indicator LED are placed along the edges. SMD components are used to keep the board size to a minimum. I selected SMD packages that are large enough to be hand soldered.

The motivation behind this board was to create an Arduino-Uno compatible board, small in size, that can be powered using alkaline batteries. This board also has the ability to keep a track of time, have sufficient built-in memory for data logging, and to be able to connect a variety of sensors using standard headers. The AC5EC board can be readily interfaced with many of the CoTs sensor modules like environment, temperature sensors, by simply connecting them in the I2C headers.