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.
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 port used for powering and programming the MONSTER M4SK board.
3.7/4.2V LiPoly battery port; battery can recharge over the Micro USB jack.
Stereo headphone jack channel connected to SAMD51 analog DAC pin A0.
Stereo headphone jack channel connected to SAMD51 analog DAC pin A1.
Molex PicoBlade mono speaker connector for smaller 8 ohm 1W speakers; speaker signal connected to A0 analog DAC.
Enables or disables the mono speaker driver.
4-pin JST SH port for optional PDM microphone; connected to SERCOM pins and read using SPI2 for PDM data.
Front capacitive touch pad nose connected to D2; usable as an input.
Tactile button connected to the seesaw chip on pin 9; button connects to ground when pressed.
Tactile button connected to the seesaw chip on pin 10; button connects to ground when pressed.
Tactile button connected to the seesaw chip on pin 11; button connects to ground when pressed.
Reverse-mount light sensor connected to the seesaw chip on pin 1; read as an analog value.
4-pin JST I2C connector clock line, shared with the seesaw chip and accelerometer; usable as board.SCL or board.STEMMA_I2C().
4-pin JST I2C connector data line, shared with the seesaw chip and accelerometer; usable as board.SDA or board.STEMMA_I2C().
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.
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 restarts firmware with one click and enters bootloader mode with two clicks.
Little red LED tied to pin D13; controllable in code and pulses in bootloader mode.
Inside-edge 9-pin JST SH connector lets the two PCB halves be separated and bridged with a 9-pin cable.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| USB Micro | Power | 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 leftA0 | GPIO, Analog | Stereo headphone jack channel connected to SAMD51 analog DAC pin A0. | |
| Headphone rightA1 | GPIO, Analog | Stereo headphone jack channel connected to SAMD51 analog DAC pin A1. | |
| SpeakerA0 | GPIO, Analog | Molex PicoBlade mono speaker connector for smaller 8 ohm 1W speakers; speaker signal connected to A0 analog DAC. | |
| Speaker enablepin 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. | |
| D2Capacitive touch nose | GPIO, Signal | Front capacitive touch pad nose connected to D2; usable as an input. | |
| Button 1seesaw pin 9 | Unknown | Tactile button connected to the seesaw chip on pin 9; button connects to ground when pressed. | |
| Button 2seesaw pin 10 | Unknown | Tactile button connected to the seesaw chip on pin 10; button connects to ground when pressed. | |
| Button 3seesaw pin 11 | Unknown | Tactile button connected to the seesaw chip on pin 11; button connects to ground when pressed. | |
| Light sensorseesaw pin 1 | Unknown | Reverse-mount light sensor connected to the seesaw chip on pin 1; read as an analog value. | |
| STEMMAGrove 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 |
| STEMMAGrove 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. | |
| D13Red LED | GPIO, Unknown | Little red LED tied to pin D13; controllable in code and pulses in bootloader mode. | |
| 9-pin JST SH interconnect | Unknown | Inside-edge 9-pin JST SH connector lets the two PCB halves be separated and bridged with a 9-pin cable. |
USB Micro port used for powering and programming the MONSTER M4SK board.
3.7/4.2V LiPoly battery port; battery can recharge over the Micro USB jack.
Stereo headphone jack channel connected to SAMD51 analog DAC pin A0.
Stereo headphone jack channel connected to SAMD51 analog DAC pin A1.
Molex PicoBlade mono speaker connector for smaller 8 ohm 1W speakers; speaker signal connected to A0 analog DAC.
Enables or disables the mono speaker driver.
4-pin JST SH port for optional PDM microphone; connected to SERCOM pins and read using SPI2 for PDM data.
Front capacitive touch pad nose connected to D2; usable as an input.
Tactile button connected to the seesaw chip on pin 9; button connects to ground when pressed.
Tactile button connected to the seesaw chip on pin 10; button connects to ground when pressed.
Tactile button connected to the seesaw chip on pin 11; button connects to ground when pressed.
Reverse-mount light sensor connected to the seesaw chip on pin 1; read as an analog value.
4-pin JST I2C connector clock line, shared with the seesaw chip and accelerometer; usable as board.SCL or board.STEMMA_I2C().
4-pin JST I2C connector data line, shared with the seesaw chip and accelerometer; usable as board.SDA or board.STEMMA_I2C().
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.
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 restarts firmware with one click and enters bootloader mode with two clicks.
Little red LED tied to pin D13; controllable in code and pulses in bootloader mode.
Inside-edge 9-pin JST SH connector lets the two PCB halves be separated and bridged with a 9-pin cable.
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.
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.
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