Heltec WiFi Kit 8
ESP8266-based IoT development board by Heltec with built-in 0.91-inch OLED display, Li-Po battery management, and WiFi connectivity in a compact 50.9x18.2mm form factor.
$7.59
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Specifications
Components
Espressif ESP8266 single-core Tensilica L06 SoC at 160 MHz with WiFi 802.11n
Solomon Systech SSD1306 OLED/PLED driver with 128×64 max resolution, I2C/SPI interface
Silicon Labs CP2104 USB-to-UART bridge for programming and serial debug
Bus Interfaces
Overview
The Heltec WiFi Kit 8 is a compact IoT development board built around the ESP8266 microcontroller. It integrates a 0.91-inch 128×32 OLED display, lithium battery management system, and 2.4 GHz WiFi — making it ideal for smart home, environmental monitoring, and IoT maker projects.
Key Features
- ESP8266 MCU running at 160 MHz (Tensilica L06 core) with 4MB flash and 520KB SRAM
- 0.91" OLED Display with 128×32 resolution for status output and data visualization
- Integrated Li-Po battery management with charge/discharge control, overcharge protection, battery detection, and USB/battery auto-switching via SH1.25×2 connector
- WiFi 802.11n at 2.4 GHz with up to 72.2 Mbps throughput
- 17 GPIOs with UART (×2), SPI (×2), I2C, I2S, and 10-bit ADC
- Micro USB with voltage regulation, ESD protection, short circuit protection, and RF shielding
- CP2104 USB-to-Serial bridge for programming and debugging
- Onboard 2.4 GHz PCB antenna
Specifications
| Spec | Value |
|---|---|
| MCU | ESP8266 (160 MHz Tensilica L06) |
| Flash | 4 MB (32M-bits SPI) |
| SRAM | 520 KB |
| Display | 0.91" OLED, 128×32 |
| WiFi | 802.11n, 2.4 GHz, up to 72.2 Mbps |
| GPIO | 17 |
| Interfaces | UART ×2, SPI ×2, I2C ×1, I2S ×1, ADC ×1 (10-bit) |
| USB | Micro USB (CP2104 bridge) |
| Battery | 3.7V Li-Po (SH1.25×2 socket) |
| Dimensions | 50.9 × 18.2 × 8 mm |
| Weight | 15 g |
| Operating Temp | -20°C to 70°C |
Packing List
- WiFi Kit 8 board ×1
- Glue rod antenna ×1
- SH1.25×2 battery connector ×1
Resources
Use Cases
4IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
Smart Home
Home automation devices for controlling lighting, climate, security, and appliances.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Educational Platform
Development boards suitable for teaching programming, electronics, and embedded systems concepts.
Where to Buy
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