Selftest amp2
About the Selftest amp2 PCB
Selftest amp2 is an open source ESP32 PCB design by LimesKey, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 30 × 20 mm, with 9 components from 8 distinct parts.
Its main chip is the ESP32-S3-WROOM-1-N16R8, from the ESP32 family. Other key parts include the QMC6309 and TVS2200DRVR. By type, the board carries 3 ICs, 3 connectors and 1 capacitor.
It belongs with the rf & radio and power & battery designs in this gallery.
From the project
A portable LoRa communicator. Custom 4-layer PCB (ESP32-S3 + E22P-915M30S LoRa + NEO-M9N GNSS), designed in KiCad for 915 MHz.
The goal is a self-contained LoRa node that pairs one of the longest range, best value LoRa modules, with an accurate GNSS reciever, running off two 21700 cells in series, to connect to other people on the LoRa mesh network community.
- 4-layer with ENIG, 60 x 130 mm - JLCPCB JLC04161H-7628 stackup, 2 oz copper outer, 2 oz copper inner - L1-L2 prepreg 0.2104 mm, Dk 4.4 - RF: 0.36mm trace width for ~50 Ω CPWG on this stackup, ground rails stitched with 0.3 mm / 0.6 mm vias at roughly 1.5 to 2 mm pitch
Main components on the Selftest amp2
Selftest amp2 bill of materials (BOM)
9 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-S3-WROOM-1-N16R8 FINEPITCH Espressif Systems | FP | U1 |
| 1 | QMC6309 COVERED QST | FP | U2 |
| 1 | TVS2200DRVR GAPPED Texas Instruments | FP | U3 |
| 1 | HDR HANXIA | FP | J1 |
| 1 | I2C3 HDR JST | FP | J2 |
| 1 | I2C1 HDR HANXIA | FP | J3 |
| 2 | NCU18XH103D60RB NTC10K Murata | FP | TH1, TH2 |
| 1 | HGC0402R5225K350NTEJ 10uF Chinocera | FP | C1 |
Selftest amp2 design files
The KiCad project lives in the LimesKey/parsnip-node repository on GitHub; these links point at the commit this page was built from.
Selftest amp2: common questions
What microcontroller does the Selftest amp2 use?
The Selftest amp2 is built around the ESP32-S3-WROOM-1-N16R8, from the ESP32 family.
How big is the Selftest amp2 PCB?
The Selftest amp2 measures 30 × 20 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Selftest amp2?
9 components, from 8 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Selftest amp2 design files?
From the LimesKey/parsnip-node repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Selftest amp2 design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Selftest amp2 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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