4 layers21 × 51 mm
Easyduino RP2040
Hanqaqa/Easyduino
Easily dive into different PCB KiCad designs of the most popular microcontroller devboards
65 parts755CERN-OHL-P-2.0
4 layers68.8 × 53.6 mm
Easyduino Atmega
Hanqaqa/Easyduino755Easily dive into different PCB KiCad designs of the most popular microcontroller devboards
- Size
- 68.8 × 53.6 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 55
- Pads
- 186
- Tracks, vias
- 391, 106
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 Apr 2026
- Updated
- 28 Jun 2026
Overview
Easyduino Atmega is an open-source printed circuit board by Hanqaqa, from the Hanqaqa/Easyduino repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 68.8 × 53.6 mm with 38 parts on 55 nets, routed with 391 tracks and 106 vias.
It is built around the ATMEGA328P-AU, CH340C and AMS1117-3.3V, with the AMS1117-5V and PRTR5V0U2X among its other parts. Its parts include 12 capacitors, 7 resistors, 5 diodes, 4 ICs and 3 connectors. It belongs with the microcontroller boards boards and the ESP32, RP2040, STM32 and AVR (ATmega, ATtiny) boards of this library.
Main components
5
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
AMS1117-3.3V
SOT-223-20℃~+85℃ 1 1.2A 1.5V@(800mA) 15V 3.3V 5mA Fixed Positive Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSJSMSEMIVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsAMS1117-5V
SOT-223SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTDDUncategorised
PRTR5V0U2X
SOT-143-55℃~+125℃ 0.3pF、0.8pF 100W 10V、15V 5V 6.5V 6A 80nA ESD IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Three channels Unidirectional SOT-143 ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICESD And Surge Protection (TVS/ESD)
README
ESP32/readme.mdESP32
The most popular WiFi Microcontroller
Schematic
KiCad Schematic symbols, footprints and 3D Models were obtained from their KiCad Github repository
Gerbers
Specs
- Input Voltage: 5V-15V(External Source 5V Pin) 5V (USB) or 3.3V (3.3V Pin). ONLY USE ONE VOLTAGE INPUT AT A TIME
- Output Current at 3.3V : 1 A (External Source) 500mA (USB)
- No Polarity Protection (External Source)
- Overcurrent Protection: None
References
ESP32 WROOM 32E
Decoupling capacitors
- ESP32 Wroom 32 E datasheet p24 -> 3.3V pin needs one 22uF and one 100nF capacitors
Enable pin (EN)
- ESP32 Devkit sch -> EN pin 10k resistor and 100nF capacitor
Thermal Pad
- ESP32 Wroom 32 E datasheet p26 -> GND Thermal needs vias between pads. Needed vias are too small for my manufacturer. I will use bigger vias
Automatic Bootloader
- ESP32 Devkit sch -> Automatic Bootloader.
USB-C
Filtering
- USB Hardware Design Guidelines for FTDI ICs p8 -> 10nF Cap + Ferrite Bead + 100nF Cap + 4.7uF Cap
- I disregarded such heavy filtering for the easier to implement 1uF and 100nF cap given in the CP2102 datasheet
- I added a polyfuse with Ihold=500mA and Itrip=1A.
Differential Pair
- USB needs 90 Ohm differential traces.
- According to JLCPCB impedance calculator, with a JLC7628 prepreg and 6mil (0.15mm) space between lines
- I have to use 9 mil tracks -> 0.2 mm
- I will use a very short trace for D+ D- (around 2mm)
- I have to place vias because of the pinout of USB C and CP2102. Some other people have done it with no problems
CP2102
- CP2102 datasheet p15 -> VBUS will be tied to REGIN. 1uF and 100 nF will be added.
- CP2102 datasheet p15 -> ESD Supression Diode for all three inputs of USB
- CP2102 datasheet p15 and p19 -> 100nF for VDD output, 4.7 uF is optional for higher current circuits.
- CP2102 datasheet p23 -> The VDD or 3.3 output can only provide 100mA. I will not use this as a voltage provider for the ciruit. I will use the AMS1117-3.3
- CP2102 datasheet p15 -> RST pulled up via 4.7k and SUSPEND~ pulled down via 10k.
AMS1117-3.3V
- AMS1117 Datasheet p1 -> 3.3V/1A Output with 5-15V Input
- AMS1117 Datasheet p4 -> 22uF tantalum capacitor on input and output.
KiCad Render
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C7 |
| 4 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4 |
| 3 | 22u | Capacitor_Tantalum_SMD:CP_EIA-3216-10_Kemet-I | C10, C11, C12 |
| 2 | 22p | Capacitor_SMD:C_0603_1608Metric | C8, C9 |
| 2 | 2k | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | D_Schottky | Diode_SMD:D_SOD-123 | D2, D3 |
| 2 | LED | Diode_SMD:D_0603_1608Metric | D4, D5 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_2.5x2.5mm | TP1, TP2 |
| 1 | 10uH | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 330 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | AMS1117-3.3V | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | AMS1117-5V | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | ATmega328P-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | Arduino_UNO_Connects | Module:Arduino_UNO_R3_WithMountingHoles | A1 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | ICSP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J3 |
| 1 | PRTR5V0U2X | Package_TO_SOT_SMD:SOT-143 | D1 |
| 1 | Polyfuse | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | SW_Push | Button_Switch_SMD:SW_SPST_Omron_B3FS-100xP | SW1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J1 |
Questions
How big is the Easyduino Atmega PCB?
It measures 68.8 × 53.6 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Easyduino Atmega use?
38 parts, built around the ATMEGA328P-AU, CH340C, AMS1117-3.3V and AMS1117-5V. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Easyduino Atmega KiCad files?
From the Hanqaqa/Easyduino repository on GitHub, at the commit this page was made from: the board is Atmega328p Arduino Uno/Easyduino_Atmega.kicad_pcb and its schematic Atmega328p Arduino Nano/Easyduino_Atmega_Nano.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Easyduino Atmega design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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