ESP8266

• 802.11 b / g / n
• Wi-Fi Direct (P2P), soft-AP
• Built-in TCP / IP protocol stack
• Built-in TR switch, balun, LNA, power amplifier and matching network
• Built-in PLL, voltage regulator and power management components
• 802.11b mode + 19.5dBm output power
• Built-in temperature sensor
• Support antenna diversity
• off leakage current is less than 10uA
• Built-in low-power 32-bit CPU: can double as an application processor
• SDIO 2.0, SPI, UART
• STBC, 1×1 MIMO, 2×1 MIMO
• A-MPDU, A-MSDU aggregation and the 0.4 Within wake
• 2ms, connect and transfer data packets
• standby power consumption of less than 1.0mW (DTIM3)

Low cost WIFI temperature (DS18B20) data logger based on ESP8266 with connectivity to thingspeak.com

1. Flashing LUA firmware
2. Setting up thinkspeak.com account
3. Uploading software