Barebones arduino with no PSU example

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This is a basic ‘barebones arduino’, this is an Atmega328 based design.

In this example we are externally powering the Atmega from a 5v source, this removes the need for a 5v on board regulator. In theory you can also remove the crystal and capacitors and use the internal clock but I kept these parts in

Here is a parts list, you can easily build this circuit on veroboard, stripboard or make your own PCB

Assembly List

LabelPart TypeProperties
C1Ceramic Capacitorpackage 200 mil [THT, multilayer]; capacitance 22pF; voltage 6.3V
C2Ceramic Capacitorpackage 200 mil [THT, multilayer]; capacitance 22pF; voltage 6.3V
J1Generic female header – 5 pinspackage THT; pin spacing 0.1in (2.54mm); pins 5; form ♀ (female); hole size 1.0mm,0.508mm; row single
J2Generic female header – 4 pinspackage THT; pin spacing 0.1in (2.54mm); pins 4; form ♀ (female); hole size 1.0mm,0.508mm; row single
J3Generic female header – 5 pinspackage THT; pin spacing 0.1in (2.54mm); pins 5; form ♀ (female); hole size 1.0mm,0.508mm; row single
J4Generic female header – 6 pinspackage THT; pin spacing 0.1in (2.54mm); pins 6; form ♀ (female); hole size 1.0mm,0.508mm; row single
J5Screw terminal – 2 pinspackage THT; pin spacing 0.137in (3.5mm); pins 2; hole size 1.0mm,0.508mm
R110kΩ Resistorpackage THT; resistance 10kΩ; bands 4; pin spacing 400 mil; tolerance ±5%
U1atmega328package dip; version Atmega328-20PU; type ATMEGA328; variant dip28 THT
XTAL1Crystalpackage THT; pin spacing 5.08mm; type crystal; frequency 16 Mhz

 

Schematic

 

 

PCB Layout

Here is a sample layout using fritzing, knocked this up quickly

Links

https://github.com/arduinolearning/Schematics-and-layouts/blob/master/Atmega328/Barebones%20No%20PSU.fzz

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