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Tiny slime

gorbit99·tiny-slime

Tiny slime PCB layout, top view — open source ESP32 board by gorbit99
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About the Tiny slime PCB

Tiny slime is an open source ESP32 PCB design by gorbit99, published on GitHub under the MIT license. It is a 2-layer board measuring 40 × 40 mm, with 12 components from 10 distinct parts.

Its main chip is the ESP32C3, from the ESP32 family. Other key parts include the TP4056 and BMI/LSM. By type, the board carries 3 ICs, 3 diodes, 3 resistors, 1 connector, 1 battery holder and 1 switch.

It belongs with the power & battery designs in this gallery.

From the project

A tiny and cheap module based SlimeVR tracker design

Tiny Slime aims to make the smallest possible SlimeVR trackers out of cheap and readily available modules while still preserving battery life.

The design uses a PCB to mount the parts to, which is placed right on top of the battery for minimal height. The final case dimensions, without the strap loops end up being around 43x43x15.2 mm or 43x43x12.2 mm.

- Negatives - BOM - PCB Ordering - Tools - Soldering - Flashing - Diagnosing problems - Case

Tiny slime, from the project README
From the project README

Main components on the Tiny slime

TP4056ESP32C3BMI/LSM

Tiny slime bill of materials (BOM)

12 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TP4056
U1
1
ESP32C3
U2
1
BMI/LSM
U3
1
AUX
J1
1
Battery_Cell
BT1
1
SW_SPDT
SW1
2
SS34
D1, D2
1
LED_Small
D3
1
1K5
1k5
R1
2
100K
100k
R2, R3

Tiny slime design files

The KiCad project lives in the gorbit99/tiny-slime repository on GitHub; these links point at the commit this page was built from.

Tiny slime: common questions

What microcontroller does the Tiny slime use?

The Tiny slime is built around the ESP32C3, from the ESP32 family.

How big is the Tiny slime PCB?

The Tiny slime measures 40 × 40 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Tiny slime?

12 components, from 10 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 Tiny slime design files?

From the gorbit99/tiny-slime repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Tiny slime design in my own project?

Yes, under the terms of its MIT license, which gorbit99 chose for the repository.

Can I test firmware for the Tiny slime 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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