HardLabs

Mlehaptics

lemonforest·mlehaptics·hardware/pcb/MLE_HAPTICS_PULSER.kicad_pcb

Mlehaptics PCB layout, top view — open source ESP32 board by lemonforest
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About the Mlehaptics PCB

Mlehaptics is an open source ESP32 PCB design by lemonforest, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 37.3 × 27.8 mm, with 29 components from 21 distinct parts.

Its main chip is the XIAO-ESP32-C6-SMD, from the ESP32 family. Other key parts include the DRV2603RUNR, MAX98357AETE_T and MAX9938TEUK_T. By type, the board carries 9 capacitors, 8 resistors, 4 ICs, 3 transistors, 3 connectors and 1 switch.

It belongs with the iot & wireless, audio and test & measurement designs in this gallery.

From the project

Open-source bilateral stimulation technology for mental wellness and therapeutic applications. Professional-grade dual ESP32-C6 hardware with wireless Bluetooth Low Energy pairing and app-based control via GATT services. Cost-effective, reliable alternative to commercial devices for therapists, researchers, wellness practitioners, and self-care.

Open-source hardware for EMDR bilateral stimulation device.

Enclosure: v0.663399u (compatible with both PCB versions)

The "T" designates Tri-Modal output: haptic (motor), visual (RGB LED), and audio (amplified speaker). This is the first revision with a dedicated audio amplifier rather than a simple piezo sounder.

The PCB uses dedicated ICs instead of discrete MOSFETs:

Main components on the Mlehaptics

XIAO-ESP32-C6-SMDDRV2603RUNRMAX98357AETE_TMAX9938TEUK_T

Mlehaptics bill of materials (BOM)

29 components, 21 distinct parts.

QtyPartRefs
1
XIAO-ESP32-C6-SMD
U1
1
DRV2603RUNR
U2
1
MAX98357AETE_T
U3
1
MAX9938TEUK_T
U4
1
DMN2004K-7
Q1
2
DMP2004K-7
Q2, Q3
1
Conn_01x04_MountingPin
J1
2
Conn_01x02_MountingPin
J2, J3
1
SW_Push
SW1
1
587-2056-147F
LED1
1
47uF
C1
1
1uF
C2
2
10uF
C3, C6
3
0.1uF
C4, C5, C7
2
0.1uF
C8, C9
2
10K
R1, R4
1
100m
R2
1
3.3K
R3
2
100K
R5, R6
1
10K
R7
Show 1 more
QtyPartRefs
1
22
R8

Mlehaptics design files

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

Mlehaptics: common questions

What microcontroller does the Mlehaptics use?

The Mlehaptics is built around the XIAO-ESP32-C6-SMD, from the ESP32 family.

How big is the Mlehaptics PCB?

The Mlehaptics measures 37.3 × 27.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mlehaptics?

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

Where can I download the Mlehaptics design files?

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

Can I use the Mlehaptics design in my own project?

Yes, under the terms of its GPL-3.0 license, which lemonforest chose for the repository.

Can I test firmware for the Mlehaptics 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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