ESP-01S ESP8266 Wi Fi Module 3 3V 0 3V Input 1MB SPI Flash -20 C to 70 C

Product description Product Parameters Core Chip: ESP8266EX (32-bit RISC processor, 80/160 MHz clock) Wi-Fi Protocol: IEEE 802.11 b/g/n (2.4 GHz band) Input Voltage: 3.3V ±0.3V DC (strictly required; external LDO needed for 4.5V-36V compatibility) Flash Memory: 1 MB SPI Antenna: Integrated PCB antenna (3 dBi gain) Serial Baud Rate: 115200 bps (default, adjustable to 9600-460800 bps) Operating Current Active mode: 70-170 mA Deep sleep: <20 μA Temperature Range: -20°C to 70°C Dimensions: 24.8 mm × 14.3 mm Pin Functions Power Management VCC: 3.3V DC input (positive power supply; must use regulated 3.3V source) GND: Power ground Control & Communication TXD: UART data transmission (output to host MCU/PC) RXD: UART data reception (input from host MCU/PC) EN(CH_PD): Chip enable (high = active; low = disable) RST: Hardware reset (low pulse ≥100ms triggers reboot) GPIO & Configuration GPIO0: Mode selection (floating/high = run mode; low = firmware download) GPIO2: Multipurpose I/O (internally pulled high; supports UART/PWM) Common Issues & Solutions Q1: Module not responding to AT commands? Verify VCC=3.3V±0.3V (use LDO regulator); ensure EN=high and GPIO0=high/floating. Q2: Serial data corruption or garbled output? Reduce TTL wire length (<10 cm) Add 100nF capacitor between VCC/GND Check baud rate (send ATto test) Q3: Failed firmware upload? Set GPIO0=low before power-on Use dedicated programmer (e.g., ESP01 PROG) Ensure 500mA power supply.

Highlights: 【High-Performance Wi-Fi Module】ESP8266EX core; 80/160 MHz clock speed; IEEE 802.11 b/g/n support; 1 MB SPI flash memory 【Low-Power Operation】70-170 mA active mode; <20 µA deep sleep; 3.3V DC input with 0.3V tolerance; Suitable for battery-powered systems 【Easy Integration】UART and SPI interfaces; compatible with STM32, Arduino, and Raspberry Pi; built-in GPIO for sensor connectivity 【Stable Performance】-20°C to 70°C operating range; 3 dBi PCB antenna; no calibration drift; reliable in home automation and IoT applications 【User-Friendly Design】Simple AT command interface; adjustable baud rate up to 460800 bps; clear pinout for easy setup and troubleshooting

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Customer feedback: 4.5/5 average rating.

Review snippets: The 8266 is quite old at this point and hard to recommend over more modern solutions. They still have their uses but in many cases you can get a more capable ESP32 C family for around the same price. This / The ESP-01S ESP8266 WiFi module is an excellent little component for anyone looking to add WiFi capabilities to their electronics projects, especially in IoT and smart home applications. Its build quality is solid, with a compact design that integrates a

Product description Product Parameters Core Chip: ESP8266EX (32-bit RISC processor, 80/160 MHz clock) Wi-Fi Protocol: IEEE 802.11 b/g/n (2.4 GHz band) Input Voltage: 3.3V ±0.3V DC (strictly required; external LDO needed for 4.5V-36V compatibility) Flash Memory: 1 MB SPI Antenna: Integrated PCB antenna (3 dBi gain) Serial Baud Rate: 115200 bps (default, adjustable to 9600-460800 bps) Operating Current Active mode: 70-170 mA Deep sleep: <20 μA Temperature Range: -20°C to 70°C Dimensions: 24.8 mm × 14.3 mm Pin Functions Power Management VCC: 3.3V DC input (positive power supply; must use regulated 3.3V source) GND: Power ground Control & Communication TXD: UART data transmission (output to host MCU/PC) RXD: UART data reception (input from host MCU/PC) EN(CH_PD): Chip enable (high = active; low = disable) RST: Hardware reset (low pulse ≥100ms triggers reboot) GPIO & Configuration GPIO0: Mode selection (floating/high = run mode; low = firmware download) GPIO2: Multipurpose I/O (internally pulled high; supports UART/PWM) Common Issues & Solutions Q1: Module not responding to AT commands? Verify VCC=3.3V±0.3V (use LDO regulator); ensure EN=high and GPIO0=high/floating. Q2: Serial data corruption or garbled output? Reduce TTL wire length (<10 cm) Add 100nF capacitor between VCC/GND Check baud rate (send ATto test) Q3: Failed firmware upload? Set GPIO0=low before power-on Use dedicated programmer (e.g., ESP01 PROG) Ensure 500mA power supply.