HardLabs

Kira

Przz23·kira·hardware/kicad/miniairobot/miniairobot.kicad_pcb

Kira PCB layout, top view — open source ESP32 board by Przz23

About the Kira PCB

Kira is an open source ESP32 PCB design by Przz23, published on GitHub. It is a 2-layer board measuring 110 × 75 mm, with 22 components from 21 distinct parts.

Its main chip is the ESP32-S3 DevKit J1 (row A), from the ESP32 family. Other key parts include the TPS61023. By type, the board carries 8 connectors, 7 capacitors, 3 resistors, 2 inductors and 1 IC.

It belongs with the audio, robotics & motion and displays & leds designs in this gallery.

From the project

Autonomous voice-AI assistant robot on ESP32-S3: C firmware, I2S audio, round SPI display, custom PCB and 3D-printed body.

Schematic-only pass, generated (not hand-drawn) from docs/power-design.md and docs/pcb-modular-architecture.md.

- miniairobot.kicadpro / .kicadsch — the project and its one schematic sheet. - MiniAIRobot.kicadsym — project-local symbol library (currently just a hand-authored TPS61023 symbol, since no exact match exists in KiCad's stock libraries). - generateschematic.py — the actual source of truth for the schematic. It builds miniairobot.kicadsch programmatically with kiutils, computing every symbol's pin connection points from the real library geometry rather than hand-typed coordinates.…

Main components on the Kira

TPS61023

Kira bill of materials (BOM)

22 components, 21 distinct parts.

QtyPartRefs
1
TPS61023
U1
1
BATTERY
J1
1
ESP32-S3 DevKit J1 (row A)
J2
1
ESP32-S3 DevKit J3 (row B)
J3
1
INMP441
J4
1
Servo
J5
1
MAX98357A
J6
1
Speaker
J7
1
GC9A01 (head, via JST-GH cable)
J8
1
3.3V buck (IC TBD)
TBD_3V3REG1
1
60R@100MHz 0603
FB1
1
1.0uH WE-TPC 744031001 (placeholder footprint, see README)
L1
1
47uF/6.3V polymer
C1
1
10uF/10V X5R 0603
C2
1
0.1uF/16V X7R 0402
C3
2
22uF/10V X5R 0805
C4, C5
1
100uF/10V low-ESR polymer
C6
1
470uF/10V low-ESR
C7
1
732k 1% 0402
R1
1
100k 1% 0402
R2
Show 1 more
QtyPartRefs
1
100k 0402
R3

Kira design files

The KiCad project lives in the Przz23/kira repository on GitHub; these links point at the commit this page was built from.

Kira: common questions

What microcontroller does the Kira use?

The Kira is built around the ESP32-S3 DevKit J1 (row A), from the ESP32 family.

How big is the Kira PCB?

The Kira measures 110 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kira?

22 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Kira design files?

From the Przz23/kira repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Kira design in my own project?

The repository has no license, so all rights stay with Przz23. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Kira 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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