# device — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link.

**2 device listed.**

## ESP8266 ESP-01S WiFi Module

Compact ESP8266-based WiFi dev board with 1MB flash, 2 GPIO pins, and 802.11 b/g/n. Runs Arduino, MicroPython, ESPHome, and Tasmota firmware for smart home and IoT projects.

[Details](https://openhardware.directory/devices/esp8266-esp-01s) | [Markdown](https://openhardware.directory/devices/esp8266-esp-01s/md)

## 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.

[Details](https://openhardware.directory/devices/heltec-wifi-kit-8) | [Markdown](https://openhardware.directory/devices/heltec-wifi-kit-8/md)