The ESP32-S is a wireless module based on ESP32, supports Wi-Fi and Bluetooth 4.2, with built-in 32Mbit Flash, in the SMD38 package. There're also onboard PCB antenna and metal shield. In short, it's a small form factor and fairly high cost effective wireless module.

With the pre-flashed AT firmware, you can control the module through UART AT commands easily. The module integrates MCU inside, supports other developments like Lua/ Micro python / Arduino to achieve flexible and fast prototyping, make it easy to integrate the module into IoT applications.

Features:

1. 802.11b/g/n Wi-Fi + BT SOC
2. Dual-core 32-bit CPU, 240 MHz frequency, computing capability up to 600DMIPS
3. Built-in two 12 bit SAR ADCs, up to 18 channels
4. Supports UART/SPI/I2C/SDIO/GPIO/ADC/PWM
5. SMD38 package
6. Supports Open OCD debug interface
7. Supports multi sleep modes, deep sleep current as low as 6.5uA
8. UART baud rate up to 4Mbps
9. Embedded Lwip and Free RTOS
10. Supports STA/AP/STA+AP operation mode
11. Supports Smart Config (APP) / Air Kiss (WeChat), one key networking
12. Supports UART local firmware upgrade and/or remote firmware upgrade (FOTA)
13. AT commands for getting started fast
14. Supports secondary development, integrated Windows / Linux environment

The ESP32-S suit for IOT applications such as:

1. Smart home
2. Intelligent building
3. Industrial automation
4. Wearable devices
5. IP camera
6. Intelligent agriculture