2 layers55.9 × 55.9 mm
2 layers100.1 × 56 mm
M302N
mhorimoto/M302NNew hardware that improves on the M302K to make it smaller, more dedicated and no-code.
- Size
- 100.1 × 56 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 46
- Pads
- 127
- Tracks, vias
- 228, 80
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Dec 2024
- Updated
- 29 Jun 2026
Overview
M302N is an open-source printed circuit board by mhorimoto, from the mhorimoto/M302N repository on GitHub. It is a 2-layer board of 100.1 × 56 mm with 33 parts on 46 nets, routed with 228 tracks and 80 vias.
It is built around the W5500, LVR040S and RJ45. Its parts include 13 connectors, 4 capacitors, 4 diodes, 3 resistors and 2 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
W5500
LQFP-48_7x7-40℃~+85℃ 10BASE-T、100BASE-TX 3.3V 32KB SPI SPI Wake-up function、Programmable LED indication、Low-power mode Yes LQFP-48(7x7) Ethernet Controllers ROHSWIZNETEthernet Controllers
LVR040S
插件,P=5.1mm240V 24s 2W 400mA 5.1mm 600mΩ 900mA 900mA 970mΩ 插件,P=5.1mm Resettable Fuses ROHSLittelfuseResettable Fuses
RJ45
TH-12PTH-12P SMT ROHSJLCPCB AssemblyUncategorised
README
README.mdM302N-ULTRA
New hardware that improves on the M302K to make it smaller, more dedicated and no-code.
M302Kを改良して小型化、専用化とノーコード化を目指した新しいハードウェア
M302N2を使用して、
- 気温湿度
- CO2
- 光量子 or 日射量
- 土中水分
を1台で観測可能とする
Main specifications
主諸元
- I2CとADC入力を備えたUECS測定ノード機
- I/Oは5V
- 電源電圧はDC12V/1A(Max)
- M800系のPoEとACアダプタなどの外部電源のどちらも使える
Revision List
1.00 初版 (2025/03/09)
2.00
- J1の結線ミスを修正 (Done 2025/05/12)
- J2のUARTはSoftwareSerial対応にして、D0,D1を空けておき、D8,D9をRX,TXに割り当てる。5V Vccの追加。 (Done 2025/05/12)
- J3の対応ピンを変更する。Hardware InterruptのD2,D3を入力端子として扱えるように。D2,3,4,5,6,7 (Done 2025/05/12)
- LED-D2はA0に割り当てる
- J9,J10 の削除 (Done 2025/05/12)
- J11 止め穴を0.1mm大きくする
- SW1はXH-B2Bに変更 (Done 2025/05/12)
- J1へCPUから5Vが逆流しないように1S4を追加 (Done 2025/05/12)
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C2, C4, C5 |
| 2 | 1S4 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | D1, D4 |
| 2 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J18, J19 |
| 2 | Conn_01x05_Socket | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J13, J14 |
| 1 | 0.1uF DDS1 | HOLLY2:DSS1 | FL1 |
| 1 | 100uF/25V | Capacitor_THT:C_Radial_D5.0mm_H11.0mm_P2.00mm | C1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D3 |
| 1 | 510 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | ADC_IN | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J6 |
| 1 | ADC_IN | Connector_JST:JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J5 |
| 1 | Arduino_Nano_v3.x | Module:Arduino_Nano | A1 |
| 1 | BP5293-50 | footprints:SIP03_BP5293_17X7P2_ROM | U2 |
| 1 | DC12V | Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal | J1 |
| 1 | DC12V FAN | Connector_JST:JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J12 |
| 1 | I2C-1 | Connector_JST:JST_XH_S4B-XH-A_1x04_P2.50mm_Horizontal | J4 |
| 1 | LED | LED_THT:LED_D3.0mm | D2 |
| 1 | LVR040 | Fuse:Fuse_BelFuse_0ZRE0033FF_L11.4mm_W3.8mm | F1 |
| 1 | RESET | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J7 |
| 1 | RJ45 | HOLLY2:RJ45_Neltron_7810-8P8C | J11 |
| 1 | TNR10V471K | Varistor:RV_Disc_D12mm_W3.9mm_P7.5mm | R3 |
| 1 | UART | Connector_JST:JST_XH_S4B-XH-A_1x04_P2.50mm_Horizontal | J2 |
| 1 | W5500 | HOLLY2:W5500LARGE | U1 |
| 1 | extend I/O | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J3 |
The 29 most common of 33 parts.
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Questions
How big is the M302N PCB?
It measures 100.1 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the M302N use?
33 parts, built around the W5500, LVR040S and RJ45. 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 M302N KiCad files?
From the mhorimoto/M302N repository on GitHub, at the commit this page was made from: the board is M302N.kicad_pcb and its schematic M302N.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the M302N design in my own project?
Its repository states no licence, so its author keeps all rights: ask mhorimoto before reusing the design.