EMERALD
About the EMERALD PCB
EMERALD 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 90 × 40 mm, with 68 components from 34 distinct parts.
Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the R1170H331B, USBLC6-2SC6, MCP6002, MCP73831T and TCAN332DR. By type, the board carries 31 resistors, 13 capacitors, 6 ICs, 5 transistors, 5 diodes and 4 switches.
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 EMERALD
EMERALD bill of materials (BOM)
68 components, 34 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | R1170H331B | SOT-89-5 | U1 |
| 1 | ESP32-C3 | ESP32-C3-WROOM-02 | U2 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U3 |
| 1 | MCP6002 | SOIC-8 | U4 |
| 1 | MCP73831T | SOT-23-5 | U5 |
| 1 | TCAN332DR | SOIC-8 | U6 |
| 1 | DMG2305UX-13 | SOT-23 | Q1 |
| 1 | DMP3036SSD-13 | SOIC-8 | Q2 |
| 2 | BC846 | SOT-23 | Q3, Q4 |
| 1 | DMN2310U | SOT-23 | Q5 |
| 1 | USB_C_USB2.0 | USB-C_MOLEX-216990-0001 | J1 |
| 1 | 18650_battery_holder | 18650_battery_holder | J2 |
| 2 | CAN_connector | IDC8_Micro-MaTch | CAN1, CAN2 |
| 1 | BTN | SW_PUSH_6mm_SMD | SW1 |
| 1 | RST | SW_PUSH_6mm_SMD | SW2 |
| 1 | EN | SW_PUSH_6mm_SMD | SW3 |
| 1 | SW_SPDT | SW_SPDT | SW4 |
| 1 | XBS306 | DO-214_(SMA) | D1 |
| 2 | Green | LED_D3.0mm | D2, D4 |
| 1 | Red | LED_D3.0mm | D3 |
Show 14 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Yellow | LED_D3.0mm | D5 |
| 5 | 10uF | C_1206_(3216) | C1, C3, C4, C10, C13 |
| 8 | 0.1uF | C_1206_(3216) | C2, C5, C6, C7, C8, C9, C11, C12 |
| 13 | 100k | R_1206_(3216) | R1, R2, R3, R4, R6, R10, R11, R12 +5 |
| 4 | 240 | R_1206_(3216) | R5, R20, R23, R24 |
| 2 | 5.1k | R_1206_(3216) | R7, R8 |
| 1 | 1M | R_1206_(3216) | R9 |
| 4 | 1.5K | R_1206_(3216) | R13, R14, R21, R27 |
| 1 | 5m | R_1206_(3216) | R15 |
| 1 | 10K | R_1206_(3216) | R19 |
| 1 | 13k | R_1206_(3216) | R25 |
| 1 | 2k | R_1206_(3216) | R26 |
| 1 | 30k | R_1206_(3216) | R29 |
| 2 | 120 | R_1206_(3216) | R30, R31 |
EMERALD 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.
EMERALD: common questions
What microcontroller does the EMERALD use?
The EMERALD is built around the ESP32-C3, from the ESP32 family.
How big is the EMERALD PCB?
The EMERALD measures 90 × 40 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the EMERALD?
68 components, from 34 distinct parts. The full bill of materials is listed on this page.
Where can I download the EMERALD 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 EMERALD 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 EMERALD 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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