The ESP-01 is a Wi-Fi module manufactured by AI-Thinker based on the ESP8266 system-on-a-chip (SoC). When the ESP8266 first hit the market around 2014, it was originally marketed as a UART-to-Wi-Fi bridge—a peripheral you could attach to an Arduino to give it internet access.
pull-ups on the RST , GPIO0 , and CH_PD (Enable) pins. This allows the module to enter boot mode stably at power-up without needing external resistors on a breadboard. esp-01 01s
No user LED. Use GPIO0 (inverted logic, external LED + resistor). The ESP-01 is a Wi-Fi module manufactured by
Insufficient power. The ESP-01S can spike to 300mA-500mA when transmitting. Solution: Do not power it from an Arduino's 3.3V pin (max 150mA). Use a dedicated 3.3V regulator like the AMS1117-3.3 or an external power supply. This allows the module to enter boot mode
You cannot use GPIO1 or GPIO3 as regular outputs during boot.
Control your home lights via MQTT or a web server.
are compact, low-cost Wi-Fi modules based on the . They are popular for adding wireless capabilities to microcontroller projects or acting as standalone microcontrollers for small IoT applications. Overview and Key Specifications I2C With the ESP8266-01 !? || Exploring ESP8266:Part 1
