# Heltec Wireless Paper > ESP32-S3 + SX1262 LoRa E-Ink development board with 2.13" e-paper display, WiFi, BLE 5.0, and LoRa connectivity. Designed for electronic shelf labels, Meshtastic mesh nodes, and low-power IoT sensor displays. ## Quick Facts - **Brand:** Heltec - **Price:** ~$15.9 - **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, vector instructions - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 2 - **RAM:** 512KB SRAM - **Flash:** 8MB (integrated) - **USB:** USB-C (USB-to-UART bridge) - **Power:** 5V via USB-C,3.7V LiPo battery - **Operating Voltage:** 3.3V - **Operating Temp:** 0°C to +50°C - **Dimensions:** 72 × 30mm - **Weight:** 60g - **Charging Port:** USB-C - **Antenna:** U.FL/IPEX (LoRa),PCB built-in (WiFi) - **SD Card:** No - **Display:** 2.13" E-Paper 250x122 ## Connectivity - **Wifi:** 802.11 b/g/n - **Bluetooth:** BLE 5.0 - **Lora:** SX1262 868, 915MHz ## Use Cases - meshtastic-mesh - electronic-shelf-labels - environmental-monitoring - asset-tracking - lora-mesh-networking ## Components - **ESP32-S3FN8** (mcu): Espressif ESP32-S3 SoC with dual-core Xtensa LX7 processor at 240MHz, integrated 8MB flash, WiFi 802.11 b/g/n, BLE 5.0, 12-bit SAR ADC (20 channels), 14 capacitive touch inputs, and hardware crypto acceleration (AES/SHA/RSA). — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - **sx1262** (radio): Semtech SX1262 LoRa transceiver supporting 150-960MHz frequency range with +22dBm transmit power, ultra-low 4.2mA receive current, and LoRa/FSK modulation for long-range LPWAN communication. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fcdn.sparkfun.com%2Fassets%2F6%2Fb%2F5%2F1%2F4%2FSX1262_datasheet.pdf&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - **DEPG0213BN** (display-driver): Good Display DEPG0213BN 2.13-inch e-paper panel with 250x122 pixel resolution, ultra-low power consumption, and 180-day image retention without power. Driven via SPI interface. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fresource.heltec.cn%2Fdownload%2FWireless_Paper%2FE-Ink%2520Datasheet&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) ## Protocols - **SPI (LoRa)** (SPI0): SCK: GPIO9, MOSI: GPIO10, MISO: GPIO11, CS: GPIO8 - **SPI (E-Ink Display)** (SPI1): SCLK: GPIO3, MOSI: GPIO2, CS: GPIO4, DC: GPIO5, RES: GPIO6, BUSY: GPIO7 - **I2C**: SDA: GPIO41, SCL: GPIO42 - **UART**: TX: GPIO43, RX: GPIO44 - **PWM** ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO0 | Boot Button (BUTTON_PIN) | — | digital-input, digital-output, strapping | | GPIO1 | A0 — Analog Input | ADC | adc, digital-input, digital-output, pwm, touch | | GPIO2 | E-Ink MOSI | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO3 | E-Ink SCLK | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO4 | E-Ink CS | SPI | digital-input, digital-output, pwm, adc, touch | | GPIO5 | E-Ink DC | — | digital-input, digital-output, pwm, adc, touch | | GPIO6 | E-Ink RES | — | digital-input, digital-output, pwm, adc, touch | | GPIO7 | E-Ink BUSY | — | digital-input, digital-output, pwm, adc | | GPIO8 | LoRa CS (SPI SS) | SPI | digital-input, digital-output, pwm, adc | | GPIO9 | SPI SCK (LoRa) | SPI | digital-input, digital-output, pwm, adc | | GPIO10 | SPI MOSI (LoRa) | SPI | digital-input, digital-output, pwm, adc | | GPIO11 | SPI MISO (LoRa) | SPI | digital-input, digital-output, pwm, adc | | GPIO12 | LoRa RESET | — | digital-input, digital-output, pwm, adc | | GPIO13 | LoRa BUSY (DIO2) | — | digital-input, digital-output, pwm, adc | | GPIO14 | LoRa DIO1 (IRQ) | — | digital-input, digital-output, pwm, adc, touch | | GPIO18 | LED Power Control | — | digital-input, digital-output, pwm | | GPIO19 | ADC Control (ADC_CTRL) | — | digital-input, digital-output, pwm | | GPIO20 | Battery Voltage ADC | ADC | adc, digital-input, digital-output | | GPIO41 | I2C SDA | I2C | digital-input, digital-output, pwm | | GPIO42 | I2C SCL | I2C | digital-input, digital-output, pwm | | GPIO43 | UART TX | UART | digital-input, digital-output, pwm | | GPIO44 | UART RX | UART | digital-input, digital-output, pwm | | GPIO45 | Vext Enable (Active Low — E-Ink Power) | — | digital-input, digital-output, strapping | ## Accessories - lora-antenna - acrylic-case ## Description ## Overview The Heltec Wireless Paper is a compact E-Ink development board built around the ESP32-S3FN8 microcontroller and Semtech SX1262 LoRa transceiver. It combines a 2.13-inch black-and-white e-paper display (250x122 pixels) with triple wireless connectivity — WiFi, Bluetooth Low Energy 5.0, and LoRa — in a pocket-sized 72x30mm form factor. The e-paper display retains its content for up to 180 days without power, making it ideal for applications where static information needs to persist. Powered via USB Type-C or a lithium battery (via SH1.25 connector), the Wireless Paper draws just 20 microamps in deep sleep mode, enabling months of battery-powered operation for remote deployments. The board includes a Vext power control pin (GPIO45) that lets firmware completely shut off the display to further reduce power consumption. The Wireless Paper has strong community support across multiple firmware platforms. It is officially supported by Meshtastic for off-grid LoRa mesh networking, works with the Arduino framework via the Heltec ESP32 library, supports PlatformIO and ESP-IDF development, and has community-contributed ESPHome configurations for Home Assistant integration. The board ships with a LoRa antenna, transparent acrylic protection plate, and SH1.25 battery connector, ready for immediate prototyping. ## Where to Buy - [Heltec Official Store](https://openhardware.directory/r?to=https%3A%2F%2Fheltec.org%2Fproject%2Fwireless-paper%2F&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) — 15.90 - [AliExpress (Heltec Store)](https://openhardware.directory/r?to=https%3A%2F%2Fwww.aliexpress.com%2Fitem%2F1005007747207784.html&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) — 15.90 - [Amazon](https://openhardware.directory/r?to=https%3A%2F%2Fwww.amazon.com%2FHeltec-Meshtastic-2-13-Inch-Electronic-902-928MHz%2Fdp%2FB0D22K2SRL&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) — 22.99 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fheltec.org%2Fproject%2Fwireless-paper%2F&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FHelTecAutomation%2FHeltec_ESP32&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fwiki.heltec.org%2Fdocs%2Fdevices%2Fopen-source-hardware%2Fesp32-series%2Flora-32%2Fwireless-paper%2F&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fresource.heltec.cn%2Fdownload%2FWireless_Paper%2FWireless-Paper.pdf&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) - [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fresource.heltec.cn%2Fdownload%2FWireless_Paper%2FWireless_Paper_V0.4_Schematic_Diagram.pdf&ref=openhardware.directory&product=heltec-wireless-paper&source=md-export) ## Images ![Heltec Wireless Paper](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-wireless-paper/6d12593e75c6.webp) ![Heltec Wireless Paper](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-wireless-paper/cc65b26dbe51.png) ![Heltec Wireless Paper](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-wireless-paper/f4bd19972079.png) ![Heltec Wireless Paper](https://nbg1.your-objectstorage.com/openhardware-directory/entities/heltec-wireless-paper/e63165cddb2e.png) > **Battery Powered:** true --- [View full device page](https://openhardware.directory/devices/heltec-wireless-paper)