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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

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Ed

2. 十一月 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.
高级
1 day

说明

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.

此步骤所需材料：

印制电路板印制电路板1 UNO-TH Rev3e layout

所需工具：

放大目镜放大目镜
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.

此步骤所需材料：

贴片排阻贴片排阻4 RN1-RN4
贴片电阻贴片电阻2 1M
贴片陶瓷电容贴片陶瓷电容11 7x100n, 2x1u, 2x22p
贴片压敏电阻贴片压敏电阻2 Z1, Z2
磁珠磁珠1 L1
贴片电感贴片电感1 L2
贴片二极管贴片二极管2 D2, D3
贴片 LED贴片 LED4 1 green, 3 yellow
焊锡丝焊锡丝1 a little

所需工具：

助焊剂助焊剂
尖头镊子尖头镊子
热风返修台热风返修台
电烙铁电烙铁
放大目镜放大目镜
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.

此步骤所需材料：

ATmega16U2 微控制器ATmega16U2 微控制器1 U3
压电陶瓷谐振器压电陶瓷谐振器1 Y2
石英晶体石英晶体1 Y1
线性稳压器线性稳压器2 U1 5 V, U2 3.3 V
运算放大器集成电路运算放大器集成电路1 U5 LMV358
P 沟道 MOSFETP 沟道 MOSFET1 T1
贴片二极管贴片二极管1 D1 M7
自恢复保险丝自恢复保险丝1 F1
有极性贴片电容有极性贴片电容2 PC1, PC2
焊锡丝焊锡丝1 a little

所需工具：

助焊剂助焊剂
尖头镊子尖头镊子
热风返修台热风返修台
电烙铁电烙铁
放大目镜放大目镜
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).

此步骤所需材料：

USB-B 插座USB-B 插座1 X2
桶形电源插座桶形电源插座1 X1
按钮按钮1 RESET
排针排针6 10x1, 2x 8x1, 6x1 female; 2x 3x2 ICSP
ATmega328P 微控制器ATmega328P 微控制器1 ZU4
焊锡丝焊锡丝1 as needed

所需工具：

电烙铁电烙铁
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.

此步骤所需材料：

Arduino Uno 固件Arduino Uno 固件1 download

所需工具：

万用表万用表
AVR ISP 编程器AVR ISP 编程器
USB-B 线USB-B 线
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);
}

所需工具：

USB-B 线USB-B 线

材料

24

所需工具

8

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Arduino Uno R3

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