ESP-01S 1MB WiFi ESP8266 - Serial Transceiver mq135 3V power supply and a

3V power supply and a logic level shifter (or voltage divider) on the TX pin from Arduino to ESP

or use an external supply within the recommended input range for standalone projects

6V Operating Current ~80 mA average Dimensions 14

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ESP-01S 1MB WiFi ESP8266 - Serial Transceiver mq135 3V power supply and aAdd WiFi to Any Microcontroller via Serial Tiny, Low Cost, Proven The ESP 01S 1MB WiFi Serial Transceiver Module is the simplest way to add WiFi connectivity to an Arduino, STM32, PIC, or any microcontroller with a UART port. Send AT commands over serial and the ESP 01S handles all WiFi networking TCP connections, HTTP requests, UDP, and more without consuming your main MCU's resources. The "S" variant upgrades the original ESP 01 with 1 MB of flash