ESP8266 ESP-01S WIFI Module

The ESP8266 WiFi module was presented at its introduction as a TTL "Serial to Internet" module. Handy to connect Arduino boards to the internet. It soon turned out that this ESP-01S module and its number of GPIO pins, outwardly carried, bigger brothers (ESP-7, ESP-12, NodeMCU etc.) can do much more than just supplement an Arduino. The processor is many times more powerful than the Atmel processor of the Arduino Uno and the memory is many times larger (1 MB!). The modules can be used as fully-fledged independent micro processors, with WiFi connectivity! "

Characteristics
Voltage: 3,3V
Supported types: 802.11 b / g / n
Features:
Wi-Fi Direct (P2P), soft-AP
Integrated TCP/IP protocol stack
Power: + 19.5dBm output in 802.11b mode
Consumption when off: <10uA
Communication: SDIO 1.1 / 2.0, SPI, UART
Wake up time: <2ms
Standby consumption: <1.0mW

Type: ESP-01S
- 2x4 2.54 mm header
- Built-in PCB-printed antenna
- 3 GPIOs: GPOI 0 / 2 / 16
- UART URXD / UTXD
- RESET en CH_PD (powerdown)
- Flash memory upgraded to 1MB