Since I don't have an environment to verify its operation, please consider it as junk. I have been storing it in a dark place. Electronic components Electronic work ↓ For more details, please refer to this site, and copy and paste the following: https://www.switch-science.com/products/2361?srsltid=AfmBOoqk2ul5pTZ2lPZZbhp2NM5dymYorV9GUYur6Awj3UG1aAeGRTpM This is an ultra-small microcontroller board equipped with the Texas Instruments (TI) CC3200, which has an ARM Cortex-M4 core. It comes standard with Wi-Fi functionality for easy internet connection. Of course, it has obtained the construction design certification (commonly known as technical suitability) that allows it to be used in Japan. It is characterized by the ability to easily configure the access point you want to connect to by using the "SmartConfig" smartphone app provided by TI. Features MCU: ARM Cortex-M4 core CC3200 Wi-Fi wireless microcontroller Operating frequency: 80 MHz Operating voltage: 2.3 V～3.6 V Input voltage: 2.3 V～3.6 V, or 3.3 V～5.5 V (VIN) Please refrain from supplying both simultaneously, as it may cause damage. RAM: 256 kB Flash memory: 1 MB I/O: 27 pins Interfaces: I2C, SPI, I2S, SD/MMC, parallel camera, serial (TX/RX) Wireless LAN: 802.11b/g/n @2.4 GHz Supported security modes: WPA2-AES (Personal/Enterprise) FCC, IC, CE, ETSI certified, Wi-Fi Alliance certified, certified to meet technical standards Application firmware can be downloaded only through wireless communication TI's application samples can be used TI and free RTOS (real-time OS) can be used Equipped with a low-power sleep mode Compatible with IoT cloud platforms such as 2lemetry, Arrayent, Exosite, IBM, Temboo & Xively Arduino-like development is possible with Energia IDE