G board
About the G board
G board is an open source ESP32 PCB design by 2technology, published on GitHub under the GPL-3.0 license. It is a board measuring 55.4 × 82 mm, with 41 components from 20 distinct parts.
Its main chip is the ESP32-DEVKITC-32D, from the ESP32 family. Other key parts include the MM74HCT245N, IRFZ44N and LM1117-3.3. By type, the board carries 17 resistors, 10 capacitors, 7 connectors, 4 ICs, 2 diodes and 1 relay.
It belongs with the iot & wireless and displays & leds designs in this gallery.
From the project
ESP32 IoT Home automation PCB - 1 * 12V relay, 4 * input button connector with HW debounce, 4 * ws2812b output
- ESP32 DEVKIT C 32D - 4 I2C connection headers - 1 12V Relay rated 16A (Schrack RTD34012 ) - 4 WS2812b LED Output channels (with Logic Level Shifter 74HCT245N) - 4 debounced pushbutton inputs
Main components on the G board
G board bill of materials (BOM)
41 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MM74HCT245N | DIP254P762X508-20 | U1 |
| 1 | ESP32-DEVKITC-32D | MODULE_ESP32-DEVKITC-32D | U2 |
| 1 | IRFZ44N | TO-220 | U3 |
| 1 | LM1117-3.3 | TO-220 | U4 |
| 1 | aRGB LEDs | TerminalBlock_Phoenix_PT-1,5-5-5.0-H_1x05_P5.00mm_Horizontal | J1 |
| 4 | I2C | PinHeader_1x04_P2.54mm_Vertical | J2, J3, J4, J5 |
| 1 | POWER + LED | TerminalBlock_Phoenix_MKDS-1,5-5-5.08_1x05_P5.08mm_Horizontal | J6 |
| 1 | Schakelaars | TerminalBlock_Phoenix_MKDS-1,5-5-5.08_1x05_P5.08mm_Horizontal | J7 |
| 1 | RTD34012 | RTD34012 | K1 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | LED | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D4 |
| 3 | 0.1μF | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C4, C5 |
| 3 | 10μF | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C3, C6 |
| 4 | 1nF | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C7, C8, C9, C10 |
| 4 | 330Ω | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1, R2, R3, R4 |
| 2 | 4.7kΩ | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R5, R6 |
| 1 | 1kΩ | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R7 |
| 5 | 10kΩ | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R8, R14, R15, R16, R17 |
| 1 | 1k | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R9 |
| 4 | 220Ω | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R10, R11, R12, R13 |
G board design files
The KiCad project lives in the 2technology/g-board repository on GitHub; these links point at the commit this page was built from.
- LayoutG-board_V0_1.kicad_pcb
G board: common questions
What microcontroller does the G board use?
The G board is built around the ESP32-DEVKITC-32D, from the ESP32 family.
How big is the G board?
The G board measures 55.4 × 82 mm and is 1.6 mm thick.
How many components are on the G board?
41 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the G board design files?
From the 2technology/g-board repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the G board design in my own project?
Yes, under the terms of its GPL-3.0 license, which 2technology chose for the repository.
Can I test firmware for the G 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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