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Elektor Uno R4

Four pins make all the difference

Elektor Uno R4
Elektor Uno R4
Labs Project
Based on a Labs project | March 2016 | Find it here
When a manufacturer releases a B version of an existing product the differences are marginal in most cases. Not so with the new ATmega328P, the processor at the heart of the Arduino Uno R3. The B upgrade of this MCU features new peripherals that justify a new revision of the Arduino Uno R3. Here is the R4.

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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

TIP: your first PCB at AISLER is free up to €30 with using the coupon code ELCCBB at checkout.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Extra info / Update

Elektor Uno R4 Key Features
• ATmega328PB @ 16 MHz
• 2 x UART
• 2 x I²C
• 2 x SPI
• 9 PWM outputs
• 8 analog inputs
• 24 GPIO pins
• On-board 5 V and 3.3 V voltage regulators
• Arduino compatible Boards package
• Open source, open hardware design.

Component list

Component List
Resistors
R7 = 0Ohm
R2,R3 = 27Ohm
R1,R4,R5,R12,R13,R14 = 1kOhm
R6,R8 = 10kOhm
R9,R10,R11 = 0Ohm
Capacitors
Default: 0805
C16,C17 = 22pF
C2,C3 = 47pF
C5,C6,C7,C8,C12,C13,C14,C15,C18 = 100nF
C10 = 1µF
C4,C9,C11 = 10µF, 10V, tantalum, case A
C1 = 47µF, 25V, electrolytic, 6.3mm diam.
Inductor
L1 = 10 µH, SMD 0805
Semiconductors
D1 = MBR120
D2, D3 = BAT54
IC1 = LD1117AS50
IC2 = FT231XS
IC3 = LD1117AS33
IC4 = ATmega328PB-AU
LED1 = green
LED2 = yellow
LED3 = red
LED4 = blue
T1 = TSM2307CX
T2 = 2N7002
Miscellaneous
F1 = PTC, 500 mA
JP1 = 3-pin pinheader, 0.1’’ pitch, right angled
Jumper for JP1
K1 = Micro USB type B receptacle
K2 = barrel jack, 1.95mm center pin
K5 = 12-way pinheader socket, 0.1’’ pitch
K4 = 10-way pinheader socket, 0.1’’ pitch
K6 = 8-way pinheader socket, 0.1’’ pitch
K7 = 6-way pinheader socket, 0.1’’ pitch
K3 = 6-pin (2x3) pinheader, 0.1’’ pitch
S1 = tactile switch, 6x6.2 mm, SMD
X1 = 16 MHz quartz crystal
PCB 150790-1 v1.2
Firmware 150790-11

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