Minimalist Arduino Board

Atmel 328PU microcontroller with minimal circuitry for 16Mhz operation

I wanted to get a feel for using the 328P without the arduino board, and practice soldering. I used this tutorial:

https://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoToBreadboard/

16Mhz operation requires two capacitors, a quartz crystal, and a 10k resistor, as represented above. It is possible to cut down on the circuitry by using the internal 8Mhz oscillator, but I didn’t do that.

Up close view of top of minimalistic 328P board.

In my prototype, to supply power I simply clip 5V and GND leads onto the pads on the sides. The two wires coming out are the UART read and write lines (serial communication).

I plugged it into power and a USB-serial device (the TPE-USBSERIAL from ThinkPenguin) and to my surprise it worked the first time. I had already loaded ulisp on the microcontroller, and was able to run some lisp commands through the serial connection.

I was surprised it simply worked, mainly because of my frightening magnet-wire solder work.

Scary looking magnet wire mess on back of prototype board.

Methinks I might have to use a bigger board next time, or figure out a different approach.

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