Wireless Paper

Board
by Heltecheltec-wireless-paper≈ cheap (under ~$15)
Verify my boardCompareEdit on GitHub
Flash this board — 1 firmware option · Known good

Specifications

Radiosinherited from ESP32-S3

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 5
Bluetooth Classic
no
802.15.4
no

USB

Native USB
yes
Connector
usb-c
Bridge chip
none — SoC native USB

Board

Form factor
heltec
Dimensions
88 × 88 × 25 mm
Battery connector
yes
Charging
yes

Display & extras

Display
2.13in 122x250 E-Ink
Extras
lorae-ink
Built onWireless Paper BoardESP32-S3 SoC

ESP32-S3FN8 + SX1262 LoRa dev board with a 2.13in E-Ink display, USB-C, and lithium battery charging — built for ultra-low-power always-on displays.

Firmware for this board

Known good

  • MeshtasticKnown goodmeshweb flasher
    Flash Meshtasticweb flasherknown-good

    Known good esp-atlas asserts this board↔firmware link at the shown trust tier — it does not guarantee your specific unit or the current firmware version. Flashing can erase keys/config and can brick the device. At your own risk.

Notes

  • ESP32-S3FN8
  • SX1262 LoRa transceiver, user-selectable 433/470-510/863-870/902-928 MHz bands
  • E-Ink image persists ~180 days without power; drag-and-drop BMP refresh
  • ESP32-S3FN8 ordering code is 8 MB in-package flash with no PSRAM, per Espressif's ESP32-S3 series datasheet
  • io.gpio_exposed=28 DERIVED: Heltec's Wireless Paper datasheet omits the Pin Definition/header table its sibling V3 boards publish, but the schematic diagram shows the same GPIO roster (GPIO0-7, 33-42, 45-46 plus TX/RX) wired to the identical 2x-header (J2+J3) carrier confirmed by name-for-name matching Pin Definition tables in the WiFi Kit 32 (V3), WiFi LoRa 32 (V3), and Wireless Stick (V3) datasheets -- each independently states 28 header-exposed GPIO pads on that shared carrier design, so the family total is applied here
  • io.gpio_free=14 DERIVED: subtracting esp32-s3's soc.reserved_pins that are exposed here (strapping {0,3,45,46}: all 4 present; usb_flash_tied {19,20,35,36,37}: all 5 present -- 9 total) and the E-Ink panel's SPI bus -- the official example sketch (Wireless_Paper_V1.0.ino) constructs the display driver as QYEG0213RWS800_BWR(rst=6, dc=5, cs=4, busy=7, sck=3, mosi=2); GPIO3 is already removed via reserved_pins so the new subtraction is {2,4,5,6,7} (5 pins) -- gives 28 - 9 - 5 = 14; the SX1262 LoRa radio's own SPI/control pins (GPIO8-14) are wired off-header as on the sibling boards and cost nothing further
  • usb_serial derived from usb.bridge (native) + soc usb.type otg-full-speed + serial-jtag

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Wireless Paper — over Web Serial, no backend, nothing leaves your browser.

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Serial monitor

Not connected.