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The Grove - UART WiFi is a serial transceiver module featuring the ubiquitous ESP8266 IoT SoC. With integrated TCP/IP protocol stack, this module lets your microcontroller interact with WiFi networks with only a few lines of code. Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning you can send simple text commands to control the device. The SoC features integrated WEP, WPA/WPA2, TKIP, AES, and WAPI engines, can act as an access point with DHCP, can join existing WiFi networks and has configurable MAC and IP addresses.

Features:

• Grove 4-pin connector (RX,TX,VCC,GND)
• 802.11 b/g/n protocol (2.4GHz)
• WiFi Direct (P2P), soft-AP
• Supports three modes: AP, STA and AP+STA coexistence mode
• Integrated TCP/IP protocol stack
• LwIP (lightweight IP)
• Integrated low power 32-bit CPU could be reprogrammed as an application processor
• Integrated temperature sensor
• Serial UART Interface
• Multi-queue QoS management
• Wake up and transmit packets in < 2ms
• Metal shielding
• Onboard ceramic antenna
• Reset switch

Specification:

• Input voltage: 3V / 5V
• Baud Rate: 115200
• Based on ESP8266 ESP-07 SoC
• AT Firmware: esp_iot_sdk_v1.1.0 + Seeed modifications:
  • 2x additional AT commands to control blue Link LED.
  • Register red WiFi LED to the ESP8266 wifi state LED.
• AT command set
• SDIO 1.1/2.0, SPI, UART
• Five power states: OFF, DEEP_SLEEP, SLEEP, WAKEUP and ON.
• Standby power consumption: < 1.0mW (DTIM=3)
• Integrated TR switch, balun, LNA and power amplifier
• Integrated PLLs, regulators, DCXO and power management units
• +19.5dBm output power in 802.11b mode
• Power down leakage current: <10uA
• Hardware accelerators for CCMP (CBC-MAC, counter mode), TKIP (MIC, RC4), WAPI (SMS4), WEP (RC4), CRC
• WPA/WPA2 PSK, and WPS driver
• A-MPDU & A-MSDU aggregation & 0.4ms guard interval
• Dimensions: 25.43mm x 20.35mm

Documents:

• Seeed Wiki Page
• Schematic
• Eagle Files
• Documentation ESP8266 (german)
• Datasheet ESP8266
• Product Page Espressif
• ESP8266 Forum
• Nurdspace: Datasheet and AT commands ESP8266
• ESP8266 datasheet (Chinese)
• ESP8266 AT command set (Chinese)
• Lua based firmware for WiFi SOC ESP8266