ESP-02S Mini ESP module

The ESP-02S is a compact Wi-Fi module based on the ESP8285 chip, which includes built-in flash memory, making it ideal for small, space-constrained IoT applications. Unlike other ESP modules requiring external antennas, the ESP-02S features an integrated PCB antenna, which simplifies setup and ensures reliable Wi-Fi performance without additional components.

Key Specifications for ESP-02S

General Specifications

1. Module Type: Wi-Fi module with built-in PCB antenna
2. Chipset: ESP8285 (similar to ESP8266 but with integrated flash)
3. Flash Memory: 1 MB (8 Mbit), embedded within the ESP8285 chip
4. Antenna: Integrated PCB antenna (optimized for 2.4 GHz)

Wireless Specifications

1. Wi-Fi Standard: 802.11 b/g/n (2.4 GHz)
2. Frequency Range: 2.4 GHz - 2.5 GHz
3. Output Power: Up to +20 dBm
4. Encryption Support: WEP, WPA/WPA2

Electrical Characteristics

1. Operating Voltage (V_CC): 3.0 V - 3.6 V (typically 3.3 V)
2. Power Consumption:
3. Deep Sleep Mode: ~10 µA
4. Modem Sleep: 15 mA
5. Transmit Mode: ~150 mA (when Wi-Fi is transmitting at full power)

Processing and Memory

1. Processor: 32-bit Tensilica L106, single-core, up to 160 MHz
2. Flash Memory: 1 MB (integrated within the ESP8285)
3. SRAM: 50 KB (for application usage, with additional reserved for system)

Interfaces

1. GPIO Pins: Up to 4 GPIOs, depending on configuration (limited compared to other ESP modules)
2. Communication Protocols:
3. UART: Available for programming and serial communication
4. PWM: Supported on available GPIOs
5. SPI and I2C: Limited support due to fewer GPIOs (basic bit-banging possible)
6. ADC Pin: 1 channel (10-bit resolution)

Key Pinout

1. Power Pins: VCC (3.3 V), GND
2. Communication Pins: RX, TX (for UART programming and serial communication)
3. GPIO Pins: GPIO0, GPIO2, GPIO12, GPIO13 (limited in number but versatile in usage)

Key Features

1. Embedded Flash: 1 MB flash within the ESP8285 reduces board size and component count
2. Built-in PCB Antenna: Integrated PCB antenna for simplified setup and reliable Wi-Fi performance
3. Compact Design: Small footprint makes it ideal for miniature or embedded applications
4. Low Power Modes: Deep sleep capability for battery-operated devices

Applications

The ESP-02S is used in applications such as:

1. Small, embedded IoT devices
2. Compact Wi-Fi-enabled sensors and actuators
3. Wearable electronics
4. Projects requiring a small, all-in-one module with integrated antenna
5. Battery-operated devices with low-power standby requirements