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Arduino Uno R3: Assembled from Arduino's Open UNO-TH Rev3e Design Files and Flashed over ICSP
MakeMagazinDE (Wikimedia Commons) · CC BY-SA 4.0
Ed

Yaremwe na

Ed

2. Ugushyingo 2026FI
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Arduino Uno R3: Assembled from Arduino's Open UNO-TH Rev3e Design Files and Flashed over ICSP

The Arduino Uno R3 is open hardware: Arduino publishes its schematic and board layout. This blueprint builds one from those files, part by part, then loads the firmware into its two processors. Result: an Arduino Uno R3. An ATmega328P (16 MHz, 32 kB flash, 2 kB SRAM, 1 kB EEPROM) runs your programs; an ATmega16U2 turns USB into its serial link. It runs from USB (5.5 V at most) or 6-20 V at the DC jack. Source: Arduino UNO-TH_Rev3e design files and the A000066 schematic and datasheet (Arduino, CC BY-SA). Unknown: how every bought part is made; no public source in hand says. The soldering method is ours. Picture: Wikimedia Commons.
Hejuru
1 day

Amabwiriza

1

Get the bare board

Have the two-layer board made to Arduino's UNO-TH_Rev3e board layout (the .brd file of the design files). Check it against the schematic before fitting anything.

Ibikoresho by'iyi ntambwe:

Ikibaho cy'umuzunguruko cyacapweIkibaho cy'umuzunguruko cyacapwe1 UNO-TH Rev3e layout

Ibikoresho bikenewe:

Lupu YaguraLupu Yagura
2

Fit the small surface-mount parts

Solder the chip parts to their marked places: resistor arrays RN1 (10K), RN2 and RN4 (1K), RN3 (22R); R1, R2 (1M); capacitors C1, C2, C4-C7, C10 (100n), C3, C8 (1u), C9, C11 (22p); varistors Z1, Z2; ferrite bead L1; inductor L2 (10 uH); diodes D2, D3; LEDs ON (green), L, RX, TX (yellow). Ours: flux, tweezers and hot air or a fine iron, checked under a loupe.

Ibikoresho by'iyi ntambwe:

Urutonde rwa rezisitansi za shipuUrutonde rwa rezisitansi za shipu4 RN1-RN4
Rezisitansi ya shipuRezisitansi ya shipu2 1M
Kondenseri ya seramike ya shipuKondenseri ya seramike ya shipu11 7x100n, 2x1u, 2x22p
Varisitori ya shipuVarisitori ya shipu2 Z1, Z2
Isaro rya feritiIsaro rya feriti1 L1
Indugitanse ishyirwa hejuruIndugitanse ishyirwa hejuru1 L2
Diyode ishyirwa hejuruDiyode ishyirwa hejuru2 D2, D3
LED ya shipuLED ya shipu4 1 green, 3 yellow
Urusinga rw'isudireUrusinga rw'isudire1 a little

Ibikoresho bikenewe:

Umuti wo gusudiraUmuti wo gusudira
Utwuma two gufata dufite impera zityayeUtwuma two gufata dufite impera zityaye
Isitasiyo yo gusana n'umwuka ushyushyeIsitasiyo yo gusana n'umwuka ushyushye
Icyuma cyo gusudiraIcyuma cyo gusudira
Lupu YaguraLupu Yagura
3

Fit the power and chip parts

Solder the ATmega16U2 (U3), the 16 MHz resonator Y2 and crystal Y1, the 5 V regulator NCP1117 (U1) and 3.3 V regulator LP2985 (U2), the LMV358 op-amp (U5), the FDN340P transistor (T1), the M7 diode (D1), the 500 mA resettable fuse (F1) and the 47 uF capacitors PC1, PC2 with their polarity as marked.

Ibikoresho by'iyi ntambwe:

Mikorokontorolewa ATmega16U2Mikorokontorolewa ATmega16U21 U3
Rezonateri ya seramike ya piyezoRezonateri ya seramike ya piyezo1 Y2
Kirisitali ya kwartsiKirisitali ya kwartsi1 Y1
Igenzura rya voltaje ry’umurongoIgenzura rya voltaje ry’umurongo2 U1 5 V, U2 3.3 V
Sirikwi ya amplifikateri y'imikorereSirikwi ya amplifikateri y'imikorere1 U5 LMV358
MOSFET y’umuyoboro PMOSFET y’umuyoboro P1 T1
Diyode ishyirwa hejuruDiyode ishyirwa hejuru1 D1 M7
Fuzibule yisubizaFuzibule yisubiza1 F1
Kondenseri ya shipu ifite impandeKondenseri ya shipu ifite impande2 PC1, PC2
Urusinga rw'isudireUrusinga rw'isudire1 a little

Ibikoresho bikenewe:

Umuti wo gusudiraUmuti wo gusudira
Utwuma two gufata dufite impera zityayeUtwuma two gufata dufite impera zityaye
Isitasiyo yo gusana n'umwuka ushyushyeIsitasiyo yo gusana n'umwuka ushyushye
Icyuma cyo gusudiraIcyuma cyo gusudira
Lupu YaguraLupu Yagura
4

Fit the through-hole parts

Solder the USB-B socket (X2), the DC jack (X1), the reset switch, the female headers (one 10-way, two 8-way, one 6-way) and the two 2x3 ICSP headers. Seat the ATmega328P in its place (ZU4).

Ibikoresho by'iyi ntambwe:

Isoketi ya USB-BIsoketi ya USB-B1 X2
Umwenge w'amashanyarazi uzengurutseUmwenge w'amashanyarazi uzengurutse1 X1
Buto ikandwaButo ikandwa1 RESET
Umurongo w'inshingeUmurongo w'inshinge6 10x1, 2x 8x1, 6x1 female; 2x 3x2 ICSP
Mikorokontorolewa ATmega328PMikorokontorolewa ATmega328P1 ZU4
Urusinga rw'isudireUrusinga rw'isudire1 as needed

Ibikoresho bikenewe:

Icyuma cyo gusudiraIcyuma cyo gusudira
5

Flash and check

Check with a meter that 5 V and GND are not shorted. Through the ICSP headers, load the USB-to-serial firmware into the ATmega16U2 and the bootloader into the ATmega328P. Plug in USB: the green ON LED lights, and the blink test in the next step flashes the L LED. Ours: an AVR ISP programmer and a multimeter.

Ibikoresho by'iyi ntambwe:

Porogaramu-shingiro ya Arduino UnoPorogaramu-shingiro ya Arduino Uno1 download

Ibikoresho bikenewe:

Igipimo cy'amashanyarazi kinyuranyeIgipimo cy'amashanyarazi kinyuranye
Igikoresho cyandika porogaramu AVR ISPIgikoresho cyandika porogaramu AVR ISP
Umugozi wa USB-BUmugozi wa USB-B
6

The blink test

blink_test.ino: the same check as Arduino's Blink example. Upload it over USB from the Arduino IDE with the board set to Arduino Uno; the L LED on pin 13 turns on for one second and off for one second, over and over. If it does, both processors, the USB link and the bootloader work.
blink_test.inocpp
// blink_test.ino - first check of a newly built Arduino Uno R3.
// The L LED is on digital pin 13 (LED_BUILTIN on the Uno).
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);  // L on
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);   // L off
  delay(1000);
}

Ibikoresho bikenewe:

Umugozi wa USB-BUmugozi wa USB-B

Ibikoresho

24

Ibikoresho bikenewe

8

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Arduino Uno R3

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