Note! The ESP-01S module from Cytron Technologies is uploaded with Cytron_ESP_AT V2.2.0, it supports more functions. For more info, please check this GitHub.

Features and specifications

• Model: ESP-01S

• Power: 3.3VDC, proper 3.3V voltage regulator, and NO level shifter is needed as the IO pins are 5V tolerant.

• 802.11 b/g/n protocol

• Wi-Fi Direct (P2P), soft-AP

• Integrated TCP/IP protocol stack

• Integrated TR switch, balun, LNA, power amplifier, and matching network

• Integrated PLLs, regulators, DCXO, and power management units

• +19.5dBm output power in 802.11b mode

• Integrated temperature sensor

• Support antenna persity

• Integrated low power 32-bit CPU could be used as an application processor
• Power down leakage current: < 10 uA
• I/O interfaces:
  • SDIO 1.1/2.0
  • SPI
  • UART
• Communication interfaces:
  • STBC
  • 1x1 MIMO
  • 2x1 MIMO
• A-MPDU & A-MSDU aggregation & 0.4 ms guard interval
• Wake up and transmit packets in < 2 ms
• Standby power consumption of < 1.0 mW (DTIM3)

Packing list

• 1 x ESP-01 WiFi Serial Transceiver Module (ESP8266) 

Resources

• Cytron ESP Firmware Github
• esp8266ex Datasheet
• esp8266 Hardware matching guide
• esp8266 AT instruction
• esp8266 AT command examples
• ESP8266 Community Forum
• Using ESP8266, a tutorial byPropellerpowered,  at Instructables
• NURDSpace Wiki
• More details