4 layers128.5 × 40 mm
Scalenode cm4-baseboard
antmicro/scalenode-cm4-baseboard
Baseboard for Raspberry Pi 4 Compute Module optimized for clustering
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4 layers77 × 45 mm
Bentroller
rbn920/bentrollerESP32 based controller board to allow turing Bentobox air filter fans on and off.
- Size
- 77 × 45 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 18
- Pads
- 54
- Tracks, vias
- 48, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Feb 2025
- Updated
- 5 Jul 2025
Overview
Bentroller is an open-source printed circuit board by rbn920, from the rbn920/bentroller repository on GitHub. It is a 4-layer board of 77 × 45 mm with 13 parts on 18 nets, routed with 48 tracks and 0 vias.
It is built around the B2B-XH-A(LF)(SN). Its parts include 5 connectors, 3 ICs and 1 diode. It belongs with the ESP32 boards of this library.
Main components
1README
README.mdBentroller V2
PCB design for controlling the populer BentoBox air filter. The PCB uses an ESP32 to simple control of the Bentobox in Home Assistant. This project is aimed primary for when the BentoBox is used in a Bambu Labs printer due to the closed firmware.
The design goals were as follows:
- Use 24v supply from the printers PSU.
- Control the fans remoteley from Home Assistant.
Bill of Materials (BOM)
| Qty | Item | Notes |
|---|---|---|
| 1 | ESP32-C3 Super Mini | |
| 1 | MP1584 voltage converter module (buck converter) | Preset to 3v is preferred but adjustable is fine. |
| 1 | D4184 MOSFET Control Module | Found here |
| 1 | 1N5819 Diode | |
| 3 | 2-pin JST-HX through hole connectors | |
| 4 | M2x6 SHCS | These are for mounting the PCB to the BentoBox. |
Printed Parts
There are parts to print in the stl folder to mount the board to the side of the BentoBox. It is a bit hacky but it works. It gets sandwiched between the fan and duct portions of the BentoBox. Print 1 of each mouth part and 4 spacers.
Changes from V2
I never published V1. I built it and imediatly updated it but the following is a list if changes made:
- Went from an ESP32-S2 to ESP32-C3. I had a handfull of S2 boards so I used it but changed to the C3 because I only needed 1 GPIO and it is more compact.
- Voltage input on the V1 used a screw terminal. V2 moved to a JST-HX.
- V2 makes all pins of the C3 available in case anyone decides to make on of these and comes up for a clever use for the additional pins.
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | B2B-XH-A_LF__SN_ | digikey-footprints:PinHeader_1x2_P2.5mm_Drill1.1mm | J1, J2, J3 |
| 1 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J4 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J5 |
| 1 | D4184 MOSFET Control Module | robby:D4184 MOSFET Control Module | U3 |
| 1 | ESP32 C3 SUPER MINI | robby:ESP32_C3_Super_Mini | U1 |
| 1 | MP1584 Module | robby:MP1584 Module | U2 |
Questions
How big is the Bentroller PCB?
It measures 77 × 45 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Bentroller use?
13 parts, built around the B2B-XH-A(LF)(SN). The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Bentroller KiCad files?
From the rbn920/bentroller repository on GitHub, at the commit this page was made from: the board is bentroller.kicad_pcb and its schematic bentroller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bentroller design in my own project?
Its repository states no licence, so its author keeps all rights: ask rbn920 before reusing the design.
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