HardLabs

Main board

denorath-sys·gridnet·hardware/pcb/main-board/main-board.kicad_pcb

Main board layout, top view — open source ESP32 board by denorath-sys

About the Main board

Main board is an open source ESP32 PCB design by denorath-sys, published on GitHub under the CERN-OHL-W-2.0 license. It is a 2-layer board measuring 100 × 80 mm, with 46 components from 34 distinct parts.

Its main chip is the ESP32-C3-MINI-1U, from the ESP32 family. Other key parts include the MCP73831-2-OT, IP5306, AMS1117-3.3, GD32VF103CCT6 and W25Q64JVSSIQ. By type, the board carries 14 resistors, 10 ICs, 10 connectors, 5 capacitors, 2 switches and 2 diodes.

It belongs with the iot & wireless designs in this gallery.

From the project

Open hardware powerline mesh communication terminal

GRIDNET — Main Board KiCad Schematic REV 0.8 (matches hardware/bom.md's Board 2 — Main Board bill of materials)

A KiCad 9 schematic (main-board.kicadsch`) for the Main Board, covering the full circuit from hardware/bom.md's "Board 2" line items: USB-C power input, Li-ion charge/boost/regulation, the GD32VF103CCT6 MCU with clock/ reset/boot/SWD, SPI flash + SRAM + microSD + RTC, the ESP32-C3-MINI-1U wireless module, and the off-board connectors for the display, keyboard controller, keyboard backlight, and speaker. There is no antenna path on this board and no RF net — see "The antenna path…

Main components on the Main board

MCP73831-2-OTIP5306AMS1117-3.3GD32VF103CCT6W25Q64JVSSIQ23LC1024DS3231MESP32-C3-MINI-1UPAM8403D

Main board bill of materials (BOM)

46 components, 34 distinct parts.

QtyPartRefs
1
MCP73831-2-OT
U1
1
IP5306
U2
2
AMS1117-3.3
U3, U4
1
GD32VF103CCT6
U5
1
W25Q64JVSSIQ
U6
1
23LC1024
U7
1
DS3231M
U8
1
ESP32-C3-MINI-1U
U9
1
PAM8403D
U10
1
2N7002
Q1
1
8MHz
Y1
1
USB-C
J1
1
BATT_2x18650_PARALLEL
J2
1
BOOT0_OVERRIDE_JUMPER
J3
1
SWD_DEBUG
J4
1
MICROSD
J5
1
CR2032_HOLDER
J6
1
RA8875_DISPLAY_MODULE
J9
1
CH552G_KEYBOARD_MCU
J10
1
KEYBOARD_BACKLIGHT_LEDS
J11
Show 14 more
QtyPartRefs
1
SPEAKER_1W_8OHM
J12
1
PWR_KEY
SW1
1
RESET
SW2
2
LED (amber)
D1, D2
1
1uH
L1
2
20pF
C1, C2
1
100nF
C3
2
22uF
C4, C5
2
5.1k
R1, R2
1
2k
R3
3
1k
R4, R5, R13
5
10k
R6, R7, R8, R11, R12
2
4.7k
R9, R10
1
0.5R
R14

Main board design files

The KiCad project lives in the denorath-sys/gridnet repository on GitHub; these links point at the commit this page was built from.

Main board: common questions

What microcontroller does the Main board use?

The Main board is built around the ESP32-C3-MINI-1U, from the ESP32 family.

How big is the Main board?

The Main board measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main board?

46 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the Main board design files?

From the denorath-sys/gridnet repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Main board design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which denorath-sys chose for the repository.

Can I test firmware for the Main board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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