HardLabs

Flexit-Button controller

KrHaaland·Flexit-Button-controller·PCB/knappepanel_flexit.kicad_pcb

Flexit-Button controller PCB layout, top view — open source ESP32 board by KrHaaland

About the Flexit-Button controller PCB

Flexit-Button controller is an open source ESP32 PCB design by KrHaaland, published on GitHub. It is a 2-layer board measuring 100 × 18.2 mm, with 24 components from 7 distinct parts.

Its main chip is the ESP32-C5Mini, from the ESP32 family. Other key parts include the AQY212S. By type, the board carries 6 ICs, 5 switches, 5 diodes, 5 resistors, 2 capacitors and 1 connector.

It belongs with the iot & wireless designs in this gallery.

From the project

ESP32-C5 button panel for the Flexit Tradition-S ventilation unit — 5 illuminated buttons emulated through opto-couplers, Wi-Fi 2.4/5 GHz, and MQTT for smart-home integration. Web UI for Wi-Fi and broker configuration. KiCad hardware included.

ESP32-C5 button panel for the Flexit Tradition-S ventilation unit. Replaces or parallels the original 5-button control panel with an isolated emulator that adds Wi-Fi (2.4 GHz + 5 GHz) and MQTT for smart-home integration.

The ESP32-C5 is currently one of the few cheap ESP modules with dual-band Wi-Fi 6, which lets the panel live on either band depending on your home network and signal coverage.

Main components on the Flexit-Button controller

AQY212S

Flexit-Button controller bill of materials (BOM)

24 components, 7 distinct parts — part numbers from the project's BOM.

QtyPartRefs
5
AQY212S
U1, U2, U3, U4, U5
1
~
U7
1
MICROMATCH_2X6
MicroMatch_2x6
J1
5
C5127964
Tactile SW 6x6mm
SW1, SW2, SW3, SW4, SW5
5
LED
D1, D2, D3, D4, D5
2
10UF
10uF
C1, C2
5
R
R1, R2, R3, R4, R5

Flexit-Button controller design files

The KiCad project lives in the KrHaaland/Flexit-Button-controller repository on GitHub; these links point at the commit this page was built from.

Flexit-Button controller: common questions

What microcontroller does the Flexit-Button controller use?

The Flexit-Button controller is built around the ESP32-C5Mini, from the ESP32 family.

How big is the Flexit-Button controller PCB?

The Flexit-Button controller measures 100 × 18.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Flexit-Button controller?

24 components, from 7 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 Flexit-Button controller design files?

From the KrHaaland/Flexit-Button-controller 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 Flexit-Button controller design in my own project?

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

Can I test firmware for the Flexit-Button controller 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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