Haptic knob
About the Haptic knob PCB
Haptic knob is an open source ESP32 PCB design by wirano, published on GitHub. It is a 4-layer board measuring 50 × 50 mm, with 66 components from 30 distinct parts.
Its main chip is the ESP32-S3-WROOM-1U, from the ESP32 family. Other key parts include the PDRV8311HRRWR, MT6701, CH224K, LSM6DSO and MT2492. By type, the board carries 33 capacitors, 12 resistors, 8 diodes, 7 ICs, 3 connectors and 1 module.
Main components on the Haptic knob
Haptic knob bill of materials (BOM)
66 components, 30 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-S3-WROOM-1U | ESP32-S3-WROOM-1U | U1 |
| 1 | PDRV8311HRRWR | PDRV8311HRRWR | U2 |
| 1 | MT6701 | QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm | U3 |
| 1 | CH224K | ESSOP-10_3.9x4.9mm_P1.00mm_EP2.3x3.2mm | U4 |
| 1 | LSM6DSO | LGA-14_3x2.5mm_P0.5mm_LayoutBorder3x4y | U5 |
| 1 | MT2492 | SOT-23-6 | U6 |
| 1 | SHT30-DIS | Sensirion_DFN-8-1EP_2.5x2.5mm_P0.5mm_EP1.1x1.7mm | U7 |
| 1 | BLDC | JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | M1 |
| 1 | Crystal_Small | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | USB_C_RECEPTACLE_USB2.0 USB_C_Receptacle_USB2.0 | USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J1 |
| 1 | CONN_01X14_SOCKET Conn_01x14_Socket | JST_SHL_SM14B-SHLS-TF_1x14-1MP_P1.00mm_Horizontal | J2 |
| 1 | CONN_ARM_SWD_TAGCONNECT_TC2030-NL Conn_ARM_SWD_TagConnect_TC2030-NL | Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J3 |
| 8 | SK6812SIDE-A | SK6812D-EC3210R | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | 10UH 10uH | L_Sunlord_SWPA3015S | L5 |
| 3 | 1UF 1uF | C_0402_1005Metric | C1, C19, C25 |
| 2 | (7pF) | C_0402_1005Metric | C2, C3 |
| 17 | 0.1UF 0.1uF | C_0402_1005Metric | C4, C5, C6, C11, C15, C20, C23, C24 +9 |
| 1 | 22UF 22uF | C_0402_1005Metric | C12 |
| 2 | 0.1uF 25V | C_0402_1005Metric | C16, C22 |
| 1 | 0.1uF 20V | C_0402_1005Metric | C17 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 10uF 25V | C_0603_1608Metric | C18, C21 |
| 1 | 22PF 22pF | C_0402_1005Metric | C26 |
| 1 | 22NF 22nF | C_0402_1005Metric | C27 |
| 3 | 22UF 22uF | C_0805_2012Metric | C28, C29, C30 |
| 7 | 10K | R_0402_1005Metric | R1, R3, R4, R6, R11, R13, R14 |
| 1 | TBD | R_0402_1005Metric | R2 |
| 1 | 0R | R_0402_1005Metric | R5 |
| 1 | 1K | R_0402_1005Metric | R7 |
| 1 | 100K | R_0402_1005Metric | R9 |
| 1 | 22K | R_0402_1005Metric | R10 |
Haptic knob design files
The KiCad project lives in the wirano/haptic-knob repository on GitHub; these links point at the commit this page was built from.
Haptic knob: common questions
What microcontroller does the Haptic knob use?
The Haptic knob is built around the ESP32-S3-WROOM-1U, from the ESP32 family.
How big is the Haptic knob PCB?
The Haptic knob measures 50 × 50 mm, has 4 copper layers and is 1.606126 mm thick.
How many components are on the Haptic knob?
66 components, from 30 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 Haptic knob design files?
From the wirano/haptic-knob 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 Haptic knob design in my own project?
The repository has no license, so all rights stay with wirano. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Haptic knob 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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