MONSTER M4SK - DIY Electronic Eyes Mask

Wearable mask board with two 240x240 IPS TFT displays driven by a 120 MHz ARM Cortex-M4. Runs animated eye graphics without a full Linux computer.

USB Micro
USB Micro port used for powering and programming the MONSTER M4SK board.
Type · power data
JST 2-PH battery
3.7/4.2V LiPoly battery port; battery can recharge over the Micro USB jack.
Type · powerVoltage · 3.7/4.2V LiPoly battery, source-stated
Headphone left / A0
Stereo headphone jack channel connected to SAMD51 analog DAC pin A0.
Type · audio
Headphone right / A1
Stereo headphone jack channel connected to SAMD51 analog DAC pin A1.
Type · audio
Speaker / A0
Molex PicoBlade mono speaker connector for smaller 8 ohm 1W speakers; speaker signal connected to A0 analog DAC.
Type · audio

Start wiring

USB · 3.3 V

Confirm the data interface matches your host board.

Module pins: JST 2-PH battery, PDM microphone port, Capacitive touch nose / D2, STEMMA/Grove SCL, STEMMA/Grove SDA, D2 JST signal, D3 JST signal. Schematik maps them to your board in the app.

Other MCUs

225 other options

Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.

View all 225

Adafruit FLORA Wearable Electronic Platform v3 visual preview

Related groups

4 groups

Arduino

About 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.

Boards · Arduino boards · 76 parts

ESP32

Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.

Boards · ESP32 boards · 111 parts

Add-ons

About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.

Boards · HATs, Shields & add-ons · 272 parts

Pi Pico

The Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.

Boards · Pico & RP2040 boards · 44 parts

Position

Type

Function

Voltage

USB Micro

power data

USB Micro port used for powering and programming the MONSTER M4SK board.

JST 2-PH battery

power

3.7/4.2V LiPoly battery port; battery can recharge over the Micro USB jack.

3.7/4.2V LiPoly battery, source-stated

Headphone left / A0

audio

Stereo headphone jack channel connected to SAMD51 analog DAC pin A0.

Headphone right / A1

audio

Stereo headphone jack channel connected to SAMD51 analog DAC pin A1.

Speaker / A0

audio

Molex PicoBlade mono speaker connector for smaller 8 ohm 1W speakers; speaker signal connected to A0 analog DAC.

Speaker enable / pin 20

control

Enables or disables the mono speaker driver.

PDM microphone port

signal

4-pin JST SH port for optional PDM microphone; connected to SERCOM pins and read using SPI2 for PDM data.

Capacitive touch nose / D2

signal

Front capacitive touch pad nose connected to D2; usable as an input.

Button 1 / seesaw pin 9

input

Tactile button connected to the seesaw chip on pin 9; button connects to ground when pressed.

Button 2 / seesaw pin 10

input

Tactile button connected to the seesaw chip on pin 10; button connects to ground when pressed.

Button 3 / seesaw pin 11

input

Tactile button connected to the seesaw chip on pin 11; button connects to ground when pressed.

Light sensor / seesaw pin 1

sensor

Reverse-mount light sensor connected to the seesaw chip on pin 1; read as an analog value.

STEMMA/Grove SCL

i2c

4-pin JST I2C connector clock line, shared with the seesaw chip and accelerometer; usable as board.SCL or board.STEMMA_I2C().

Connector defaults to 5V; solder/cut jumper can change it between 5V and 3V, source-stated

STEMMA/Grove SDA

i2c

4-pin JST I2C connector data line, shared with the seesaw chip and accelerometer; usable as board.SDA or board.STEMMA_I2C().

Connector defaults to 5V; solder/cut jumper can change it between 5V and 3V, source-stated

D2 JST signal

gpio

3-pin JST digital/analog connector signal; can be analog input or digital I/O, exposed as board.D2 or Arduino digital 2 and analog A2.

D3 JST signal

gpio

3-pin JST digital/analog connector signal; can be analog input or digital I/O, exposed as board.D3 or Arduino digital 3 and analog A3.

Reset button

control

Reset button restarts firmware with one click and enters bootloader mode with two clicks.

Red LED / D13

indicator

Little red LED tied to pin D13; controllable in code and pulses in bootloader mode.

9-pin JST SH interconnect

board interconnect

Inside-edge 9-pin JST SH connector lets the two PCB halves be separated and bridged with a 9-pin cable.

Pinout

Start wiring

Arduino

ESP32

Add-ons

Pi Pico