LaskaKit ESPink-4.2 ESP32 e-Paper

Product detailed description

LaskaKit ESPink-4.2 is a ready-to-use development board featuring an ESP32-S3 and a 4.2" ePaper display with a 400 × 300 px resolution, designed for low-power battery-operated displays. The display is available in black and white, red-black-white, or four-colour variants. Power for both the display and sensors is switched via GPIO, so the board consumes only around 16 μA in deep sleep. It is programmed via USB-C, which also charges the connected Li-Pol battery. The board features I2C and SPI μShup connectors for easy and secure sensor connection without the risk of reverse polarity, a microSD card slot, three user buttons, and an onboard SHT40 temperature and humidity sensor.

Specifications:

• Board version: v3.1
• Microcontroller: ESP32-S3 (ESP32-S3-WROOM-1-N16R8 module, 16 MB Flash, 8 MB PSRAM), Wi-Fi, Bluetooth LE
• Display: 4.2", 400 × 300 px, Good Display
  • Black and white: GDEQ042T81, greyscale, partial refresh
  • Red-black-white: GDEY042Z98, full refresh approx. 22 s
  • Four-colour (yellow, red, black, white): GDEM042F52, full refresh approx. 20 s
• Supply voltage: 3.7–5.5 V
• Power Supply:
  • USB-C (5 V)
  • Li-Pol battery 3.7 V, JST-PH 2.0 connector
  • battery charging via USB-C (TP4054 charger, indicator LED)
  • power switch
• Deep-sleep current: approx. 16 μA (board with display only, without connected peripherals)
• Programming: via USB-C, CH9102F USB–UART converter
• Connectors and Interfaces:
  • 2× I2C μShup (JST-SH 4pin, compatible with Stemma QT / Qwiic) – SDA GPIO42, SCL GPIO2
  • 1× SPI μShup – CS GPIO46, MOSI GPIO3, SCK GPIO14, MISO GPIO21
  • microSD card slot – CS GPIO17, MOSI GPIO11, SCK GPIO12, MISO GPIO13, card detection GPIO16
• Onboard sensor: SHT40 (temperature, humidity), connected to the I2C bus
• Buttons: RESET and 3 user buttons (GPIO39, GPIO40, GPIO41)
• ePaper pinout (standard for GxEPD2):
  • MOSI/SDI: GPIO11
  • CLK/SCK: GPIO12
  • CS: GPIO10
  • DC: GPIO48
  • RST: GPIO45
  • BUSY: GPIO38
• Display and peripheral power switching: GPIO47, active HIGH
• Battery voltage measurement: voltage divider on GPIO9, divider ratio 1.769388
• Compatibility: Arduino IDE (GxEPD2 library), ESP-IDF
• Suitable battery: LaskaKit LiPol Battery 503759 1200mAh 3.7V JST-PH 2.0
• Suitable case: LaskaKit Case for ESPink-4.2 (3D print)
• Suitable sensors with µSup connector:
  • BME280 (pressure, temperature, humidity)
  • SCD41 (CO2, temperature, humidity)
  • BH1750 (light intensity)
• Dimensions: approx. 92 × 88 × 9.1 mm
• Weight: 50 g

Package contents:

• 1× LaskaKit ESPink-4.2 ESP32 e-Paper with display according to the selected variant

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change their basic properties.
• The boards are equipped with Good Display screens (original Waveshare displays are no longer produced). Support for these displays in ESPHome may not be complete yet – if you plan to use ESPHome, please verify compatibility in advance.
• Battery not included.
• The 3D printed case is not included; you can print it or purchase it separately (only for non-touch versions).
• The user buttons are on GPIO39–41, which are not RTC pins – they will not wake the board from deep sleep. You can wake it using the RESET button or a timer.