Arduino Compatible Development Board Known as uDuino

The project is a way of building a cheaper Arduino-compatible board with very little extra time investment on each.

In collecting parts for the cable adapter, small bit of PC board with 8×2 holes is needed along with 0.1uF capacitor, spacing header, and some connecting wires. The programming cable adapter only needs to route signals from the FTDI USB cable to the right pins on ATmega168 chips. To allow the Arduino software to reset the chips, the capacitor is added on one set of pins. This capacitor will allow a short pulse to pass over to the chip’s reset when the Arduino software flips the RTS pin.

ATmega168 chips have an internal oscillator which can be enabled and it runs at about 8MHz which is half the speed of most Arduino boards. The internal oscillator is guaranteed to be calibrated to within 10%. Short lengths of wires are used when placing the ATmega168 on the breadboard, straddling the center. The hole at each ATmega168 pin that is the closest to the chip that is open is used for each of the following connections leaving the last hole open in each row.
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