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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

Imeundwa na

Ed

2. Novemba 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.
Juu
1 day

Maagizo

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.

Vifaa kwa hatua hii:

Bamba la mzunguko lililochapishwaBamba la mzunguko lililochapishwa1 UNO-TH Rev3e layout

Zana zinazohitajika:

Lupu ya KukuzaLupu ya Kukuza
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.

Vifaa kwa hatua hii:

Mpangilio wa vipingamizi vya chipuMpangilio wa vipingamizi vya chipu4 RN1-RN4
Kipingamizi cha chipuKipingamizi cha chipu2 1M
Kapasita ya kauri ya chipuKapasita ya kauri ya chipu11 7x100n, 2x1u, 2x22p
Varista ya chipuVarista ya chipu2 Z1, Z2
Ushanga wa feritiUshanga wa feriti1 L1
Indakta ya kupachika juuIndakta ya kupachika juu1 L2
Diodi ya kupachika juuDiodi ya kupachika juu2 D2, D3
LED ya chipuLED ya chipu4 1 green, 3 yellow
Waya wa LehemuWaya wa Lehemu1 a little

Zana zinazohitajika:

FluksiFluksi
Kibano chenye ncha nyembambaKibano chenye ncha nyembamba
Kituo cha kurekebisha kwa hewa motoKituo cha kurekebisha kwa hewa moto
Chuma cha kulehemiaChuma cha kulehemia
Lupu ya KukuzaLupu ya Kukuza
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.

Vifaa kwa hatua hii:

Kidhibiti-ndogo ATmega16U2Kidhibiti-ndogo ATmega16U21 U3
Resoneta ya kauri ya piezoResoneta ya kauri ya piezo1 Y2
Kioo cha kwatsiKioo cha kwatsi1 Y1
Kidhibiti volteji cha mstariKidhibiti volteji cha mstari2 U1 5 V, U2 3.3 V
IC ya kikuza-isharaIC ya kikuza-ishara1 U5 LMV358
MOSFET ya chaneli-PMOSFET ya chaneli-P1 T1
Diodi ya kupachika juuDiodi ya kupachika juu1 D1 M7
Fyuzi inayojirudishaFyuzi inayojirudisha1 F1
Kapasita ya chipu yenye nchaKapasita ya chipu yenye ncha2 PC1, PC2
Waya wa LehemuWaya wa Lehemu1 a little

Zana zinazohitajika:

FluksiFluksi
Kibano chenye ncha nyembambaKibano chenye ncha nyembamba
Kituo cha kurekebisha kwa hewa motoKituo cha kurekebisha kwa hewa moto
Chuma cha kulehemiaChuma cha kulehemia
Lupu ya KukuzaLupu ya Kukuza
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).

Vifaa kwa hatua hii:

Soketi ya USB-BSoketi ya USB-B1 X2
Tundu la umeme la duaraTundu la umeme la duara1 X1
Kitufe cha kubonyezaKitufe cha kubonyeza1 RESET
Safu ya piniSafu ya pini6 10x1, 2x 8x1, 6x1 female; 2x 3x2 ICSP
Kidhibiti-ndogo ATmega328PKidhibiti-ndogo ATmega328P1 ZU4
Waya wa LehemuWaya wa Lehemu1 as needed

Zana zinazohitajika:

Chuma cha kulehemiaChuma cha kulehemia
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.

Vifaa kwa hatua hii:

Programu dhibiti ya Arduino UnoProgramu dhibiti ya Arduino Uno1 download

Zana zinazohitajika:

Kipima-umeme cha aina nyingiKipima-umeme cha aina nyingi
Kiprogramu cha AVR ISPKiprogramu cha AVR ISP
Kebo ya USB-BKebo ya 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);
}

Zana zinazohitajika:

Kebo ya USB-BKebo ya USB-B

Vifaa

24

Zana Zinazohitajika

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