BinKey

itead-psf-wifi-modules

4 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

ITEAD PSF WiFi Modules Collection

Details

  • Location: Cabinet-3, Bin 17
  • Category: Wireless Modules
  • Brand: ITEAD Studio
  • Chip: ESP8285 (ESP8266 with integrated 1MB flash)
  • Total Quantity: 10 modules
  • Models: PSF-A85 and PSF-B85

Description

Collection of ITEAD PSF (Personal Smart Firmware) WiFi modules based on the ESP8285 chip. These ultra low-power modules are designed for IoT applications, providing WiFi connectivity with built-in microcontroller capabilities. Perfect for serial-to-WiFi bridges, IoT devices, and wireless control applications.

Module Variants

PSF-A85 - Stamp Hole Interface

  • Quantity: 5 modules
  • Package: 13.5mm × 13.7mm × 1mm
  • Antenna: Dual interface (IPEX connector + stamp hole)
  • Features:
    • Stamp hole antenna interface for custom PCB antennas
    • IPEX connector for external antennas
    • Ultra-compact form factor
    • All GPIO pins accessible

PSF-B85 - Onboard Ceramic Antenna

  • Quantity: 5 modules
  • Package: Similar compact size
  • Antenna: Onboard ceramic antenna
  • Features:
    • Built-in ceramic antenna (no external antenna needed)
    • Ready-to-use design
    • Optimized for space-constrained applications
    • No antenna design required

Images

ITEAD PSF-A85 WiFi Module

ITEAD PSF-B85 WiFi Module

Technical Specifications

Core Processor

  • Chip: ESP8285 (ESP8266 + 1MB integrated flash)
  • Architecture: 32-bit Tensilica L106 RISC processor
  • Clock Speed: 80MHz (can be overclocked to 160MHz)
  • Flash Memory: 1MB integrated flash memory
  • RAM: 96KB data RAM, 64KB instruction RAM

WiFi Specifications

  • Standard: IEEE 802.11 b/g/n/d/e/i/k/r
  • Frequency: 2.412GHz - 2.484GHz
  • Modes: STA/AP/STA+AP
  • Security: WEP/WPA-PSK/WPA2-PSK
  • Encryption: WEP64/WEP128/TKIP/AES

Power Specifications

  • Operating Voltage: 3.3V
  • Operating Current:
    • Active: ~70mA average, 200mA peak
    • Standby: <200µA
    • Deep Sleep: 0.5µA
  • Transmit Power:
    • 802.11b: +20dBm ±2dBm
    • 802.11g: +17dBm ±2dBm
    • 802.11n: +14dBm ±2dBm

Interface Capabilities

  • GPIO Pins: 9 available GPIO pins
  • UART: Full duplex, up to 921600 bps
  • SPI: Master/Slave mode
  • I2C: Master/Slave mode
  • PWM: Software PWM on any GPIO
  • ADC: 1 channel, 0-1V input range

Applications

IoT Applications

  • Smart Home: Light switches, sensors, thermostats
  • Industrial IoT: Remote monitoring and control
  • Agricultural: Soil moisture, weather stations
  • Security: Door sensors, motion detectors
  • Energy: Smart meters, power monitoring

Communication Applications

  • Serial-to-WiFi: Convert UART devices to WiFi
  • Wireless Bridge: Connect legacy devices to WiFi
  • Data Logger: Remote data collection and transmission
  • Remote Control: WiFi-enabled device control
  • Telemetry: Sensor data transmission

Development Applications

  • Prototyping: Quick WiFi connectivity for projects
  • Educational: Learning IoT and WiFi programming
  • Maker Projects: DIY smart devices
  • Research: Wireless sensor networks
  • Testing: WiFi protocol development

Programming and Development

Firmware Options

  • AT Commands: Default firmware with AT command set
  • Arduino IDE: Program using Arduino-style code
  • ESP-IDF: Espressif’s official development framework
  • MicroPython: Python-based firmware
  • NodeMCU: Lua-based firmware

Development Tools

  • Arduino IDE: Popular choice for beginners
  • PlatformIO: Professional IDE with advanced features
  • ESP Flash Tool: Official flashing utility
  • esptool.py: Command-line flashing tool

Programming Interface

  • UART Programming: Standard method using RX/TX pins
  • OTA Updates: Over-the-air firmware updates
  • Debug Interface: Serial debugging capabilities
  • GPIO Programming: Direct pin control

Pin Configuration

Standard GPIO Pins

  • GPIO0: Boot mode selection, general I/O
  • GPIO2: UART1_TX, general I/O (boot strapping)
  • GPIO4: General I/O
  • GPIO5: General I/O
  • GPIO12-16: General I/O pins
  • ADC: Analog input (0-1V)

Special Function Pins

  • EN: Chip enable (active high)
  • RST: Reset pin (active low)
  • RX/TX: UART communication
  • VCC: 3.3V power supply
  • GND: Ground connections

Advantages

Design Benefits

  • Integrated Flash: No external flash memory required
  • Compact Size: Minimal PCB footprint
  • Low Power: Excellent for battery-powered applications
  • Cost Effective: Affordable WiFi connectivity solution

Technical Benefits

  • Dual Core: WiFi and application processing
  • Rich Interfaces: Multiple communication protocols
  • Flexible Antenna: Multiple antenna options
  • Robust Protocol: Industrial-grade WiFi implementation

Development Considerations

Power Management

  • 3.3V Supply: Requires regulated 3.3V power
  • Current Spikes: Handle 200mA peak current
  • Sleep Modes: Utilize deep sleep for battery applications
  • Power Sequencing: Proper startup sequence required

RF Considerations

  • Antenna Placement: Keep antenna clear of metal
  • Ground Plane: Proper PCB ground plane design
  • Impedance Matching: 50Ω antenna traces
  • Certification: Consider regulatory requirements

Programming Tips

  • Boot Mode: GPIO0 and GPIO2 control boot mode
  • Flash Size: 1MB flash limits application size
  • Memory Management: Efficient use of limited RAM
  • Watchdog: Implement proper watchdog handling

Common Applications Examples

Smart Switch

// Basic WiFi switch control
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
 
const int relayPin = 5;
ESP8266WebServer server(80);
 
void setup() {
  pinMode(relayPin, OUTPUT);
  WiFi.begin("SSID", "password");
  server.on("/on", []() {
    digitalWrite(relayPin, HIGH);
    server.send(200, "text/plain", "ON");
  });
  server.begin();
}

Sensor Data Logger

// Temperature sensor with WiFi reporting
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
 
void setup() {
  WiFi.begin("SSID", "password");
}
 
void loop() {
  float temp = readTemperature();
  sendToServer(temp);
  ESP.deepSleep(60e6); // Sleep 1 minute
}

Tags

itead, psf, esp8285, wifi, iot, wireless, uart, gpio, pwm

Notes

These ITEAD PSF modules provide an excellent entry point into ESP8285-based IoT development. The integrated flash memory eliminates the need for external storage, while the compact form factor makes them ideal for space-constrained applications. The choice between PSF-A85 (flexible antenna options) and PSF-B85 (built-in antenna) depends on specific application requirements and PCB design constraints.

Graph View

Backlinks