AMETHYST
About the AMETHYST PCB
AMETHYST is an open source ESP32 PCB design by GemsErasmusPlus, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 40 × 40 mm, with 37 components from 24 distinct parts.
Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the R1170H331B and USBLC6-2SC6. By type, the board carries 17 resistors, 8 capacitors, 5 connectors, 3 ICs, 2 switches and 1 transistor.
From the project
electronics design for the GEMS educational hardware
Project GEMS - Graceful Equalising of Mechatronics Students aims to develop affordable educational hardware for mechatronics students, along with supporting online courses and tutorials. This will allow all students to have equal learning opportunities, regardless of their background or learning needs.
Main components on the AMETHYST
AMETHYST bill of materials (BOM)
37 components, 24 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-C3 | ESP32-C3-WROOM-02 | U1 |
| 1 | R1170H331B | SOT-89-5 | U2 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U3 |
| 1 | TEPT5700 | PT_D5.0mm | Q1 |
| 1 | RGB | PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | LX | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | I2C | PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | UART | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | USB_C_USB2.0 | USB-C_MOLEX-216990-0001 | J5 |
| 1 | BTN | SW_PUSH_6mm_SMD | SW1 |
| 1 | RST | SW_PUSH_6mm_SMD | SW2 |
| 1 | LED_BkRG | LED_D5.0mm-4_RGB | D1 |
| 5 | 0.1uF | C_1206_(3216) | C1, C2, C4, C5, C8 |
| 3 | 10uF | C_1206_(3216) | C3, C6, C7 |
| 4 | 100k | R_1206_(3216) | R1, R2, R3, R4 |
| 1 | 0 | R_1206_(3216) | R5 |
| 2 | 27 | R_1206_(3216) | R6, R8 |
| 1 | 82 | R_1206_(3216) | R7 |
| 3 | 5.1k | R_1206_(3216) | R9, R15, R16 |
| 1 | 510 | R_1206_(3216) | R10 |
Show 4 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10k | R_1206_(3216) | R11 |
| 1 | 200k | R_1206_(3216) | R12 |
| 2 | 2.2k | R_1206_(3216) | R13, R14 |
| 1 | 1M | R_1206_(3216) | R17 |
AMETHYST design files
The KiCad project lives in the GemsErasmusPlus/GEMS_Electronics repository on GitHub; these links point at the commit this page was built from.
AMETHYST: common questions
What microcontroller does the AMETHYST use?
The AMETHYST is built around the ESP32-C3, from the ESP32 family.
How big is the AMETHYST PCB?
The AMETHYST measures 40 × 40 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the AMETHYST?
37 components, from 24 distinct parts. The full bill of materials is listed on this page.
Where can I download the AMETHYST design files?
From the GemsErasmusPlus/GEMS_Electronics repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the AMETHYST design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which GemsErasmusPlus chose for the repository.
Can I test firmware for the AMETHYST 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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