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LaskaKit ESPink-Frame-7.x — low-power ESP32-S3 board for large 7.5" and 7.3" ePaper displays

ESPink-Frame-7.x is a universal, ultra-low-power board built around the ESP32-S3 for large 800 × 480 px ePaper displays. It drives the black & white and four-colour 7.5" panels as well as the six-colour 7.3" Spectra 6. It is the heart of the LaskaKit Live-7.x-Pro kit — a Wi-Fi photo frame / dashboard for the Živý Obraz service — but it is just as useful for your own projects.

The board is designed for long battery life: the display, sensors, the μŠup connectors and the microSD card are all powered from a separate regulator that you switch off with a single GPIO before going to deep sleep. The battery is charged directly from USB-C, which is also used for programming via the CH9102F converter.

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Main features

• ESP32-S3-WROOM-1U-N16R8 — 16 MB Flash, 8 MB PSRAM, Wi-Fi and Bluetooth LE, U.FL connector for an external antenna (the board sits behind a large display, so an external antenna gives much better range)
• Two display connectors:
  • 24-pin FPC for 7.5" panels (GDEY075T7, GDEM075F52)
  • 50-pin FPC for the 7.3" Spectra 6 panel (GDEP073E01)
• Switchable peripheral power — GPIO47 switches the VSENSOR rail (RT9080 regulator) that feeds the ePaper, μŠup connectors, the onboard SHT40, the microSD card and the expansion header
• Li-Po battery charging from USB-C (TP4054, approx. 0.56 A), JST-PH 2.0 battery connector, charge LED
• Battery voltage measurement via a voltage divider on GPIO9
• Power switch disconnecting the battery
• Onboard SHT40 temperature and humidity sensor
• μŠup connectors — 1× I2C (compatible with Adafruit Stemma QT / SparkFun Qwiic) and 1× SPI
• microSD card slot with card-detect
• 3 user buttons (UP / PUSH / DOWN) + RESET
• 1×15 expansion header with unused GPIOs
• 4× M2.5 stand-offs for mounting

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Supported displays

Display	Size	Resolution	Colours	Refresh	DISPLAY jumper
Good Display GDEY075T7	7.5"	800 × 480	black & white, 4 grey levels	fast (~3.5 s), partial refresh	LEFT (0.44 Ω)
Good Display GDEM075F52	7.5"	800 × 480	black, white, red, yellow	slow (~22 s)	open (2.2 Ω, default)
Good Display GDEP073E01	7.3"	800 × 480	Spectra 6 — black, white, red, yellow, blue, green	slow (~19 s)	RIGHT (0.1 Ω)

Important: the DISPLAY solder jumper sets the current-sense resistor of the ePaper boost converter. Set it according to the display you use (see the table above and the schematic).

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Specifications

Parameter	Value
MCU	ESP32-S3 (ESP32-S3-WROOM-1U-N16R8), 16 MB Flash, 8 MB PSRAM
Wireless	Wi-Fi 2.4 GHz, Bluetooth LE, external antenna via U.FL
Supply	USB-C 5 V or 1-cell Li-Po 3.7 V (JST-PH 2.0)
Charging	TP4054, approx. 0.56 A
USB-UART	CH9102F
Regulators	2× RT9080-33 (always-on 3.3 V for the MCU, switchable VSENSOR 3.3 V for peripherals)
Onboard sensor	SHT40 (I2C, address 0x44)
Logic level	3.3 V
Dimensions	approx. 185 × 120 × 8 mm (board with display)
Weight	140 g
Hardware revision	v1.2

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Pinout

ePaper (GxEPD2 standard)

Signal	GPIO
MOSI / SDI	11
CLK / SCK	12
CS	10
DC	48
RST	45
BUSY	38
Peripheral power VSENSOR (HIGH = ON)	47

I2C μŠup + onboard SHT40

Signal	GPIO
SDA	42
SCL	2

SPI μŠup

Signal	GPIO
CS	46
MOSI	3
CLK	14
MISO	21

microSD card (shares SPI with the ePaper)

Signal	GPIO
CS	17
MOSI	11
CLK	12
MISO	13
Card detect	16

Buttons (active LOW, external 10k pull-up)

Button	GPIO
UP	39
PUSH	40
DOWN	41

GPIO39–41 are not RTC GPIOs, so the UP / PUSH / DOWN buttons cannot wake the ESP32-S3 from deep sleep. Wake the board with the RESET button or a timer.

Battery voltage

Signal	GPIO
Divider 1 MΩ / 1.3 MΩ	9

float vBat = analogReadMilliVolts(9) * 1.769 / 1000.0; // battery voltage in V

Expansion header JP1 (1×15, 2.54 mm)

Pin	Signal	Pin	Signal
1	IO1	9	IO15
2	IO37	10	IO7
3	IO36	11	IO6
4	IO35	12	IO5
5	IO20	13	IO4
6	IO19	14	GND
7	IO8	15	VSENSOR (switched 3.3 V)
8	IO18

IO35, IO36 and IO37 are used internally by the octal PSRAM of the N16R8 module — do not use them.

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Živý Obraz

The board is supported by Živý Obraz — show your photos, a calendar (Google, Outlook, Apple), weather forecast, values from a weather station or home automation without writing any code.

1. Open the web installer.
2. Select the board LaskaKit ESPink 2.x, 3.5 and 3.6 and your display type (GDEY075T7, GDEM075F52 or GDEP073E01).
3. Flash the firmware, connect to Wi-Fi and follow the documentation.

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Example code

Arduino examples are in the SW folder. They use the GxEPD2 library — select your display with the #define DISP_... at the top of the sketch.

Example	Description
GxEPD2_SHT40	Temperature, humidity and battery voltage on the display, then deep sleep
GDEP073E01_GxEPD2	Six-colour Spectra 6 display with GxEPD2
GDEP073E01_ESP32	Six-colour Spectra 6 display with the Good Display driver (image from image.h)
Buttons	Reading the UP / PUSH / DOWN buttons
I2C_test	I2C bus scan
SD_Test	microSD card test

Don't forget to set GPIO47 HIGH before talking to the display, sensors or SD card, and LOW before going to deep sleep.

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Repository contents

• HW — schematics (PDF)
• 3D — 3D model of the board (STEP, Fusion 360)
• Production — production data (Gerber, BOM, CPL)
• SW — example code
• Version.md — hardware revision history

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Where to buy

• Board: LaskaKit ESPink-Frame-7.x e-Paper Board
• Complete kit with display, battery, antenna and frame: LaskaKit Live-7.x-Pro
• Sensors with μŠup connector: SHT40, BME280, SCD41