I2C Modules – Hamtech Electronics Technologies https://hamtechtechnologies.com Sun, 30 Nov 2025 15:59:21 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.3 https://hamtechtechnologies.com/wp-content/uploads/2025/11/h-100x100.webp I2C Modules – Hamtech Electronics Technologies https://hamtechtechnologies.com 32 32 PCF8574 Expander https://hamtechtechnologies.com/product/pcf8574-expander/ https://hamtechtechnologies.com/product/pcf8574-expander/#respond Thu, 20 Nov 2025 19:52:04 +0000 https://hamtechtechnologies.com/index.php/product/pcf8574-expander/ PCF8574 I2C Expander is an 8-bit I/O expander for I2C bus systems, allowing you to increase the number of digital I/O pins for microcontrollers like Arduino, ESP32, or Raspberry Pi.]]> The PCF8574 I2C Expander is a versatile module that communicates via the I2C protocol, providing 8 additional digital input/output pins using only two microcontroller pins (SDA and SCL). It is perfect for projects that need extra GPIO pins without complex wiring. The module supports up to 8 devices on the same I2C bus with configurable addresses. Ideal for driving LEDs, reading buttons, controlling relays, and other digital I/O operations.

Key Features

  • Adds 8 digital I/O pins via I2C interface

  • Only uses 2 microcontroller pins (SDA, SCL)

  • Address selectable via 3 address pins (A0, A1, A2)

  • Compatible with Arduino, ESP32, ESP8266, and Raspberry Pi

  • Low power consumption, suitable for battery-operated projects

Variants

  • PCF8574 Standard I2C Expander Module

  • PCF8574A Variant (alternate address range)

Specifications

Feature Details
I/O Pins 8 (P0–P7)
Interface I2C (SDA, SCL)
Address Pins 3 (A0, A1, A2)
Operating Voltage 3.3V – 5V
Max Current per Pin 25 mA
Communication Speed Up to 400 kHz

Applications

  • Expand GPIO for Arduino, ESP32, Raspberry Pi

  • Drive multiple LEDs or relays

  • Read multiple buttons or switches

  • Control digital devices in IoT projects

  • Microcontroller-based automation systems

Compatible Boards / Circuits

  • Arduino Uno, Mega, Nano

  • ESP32 / ESP8266

  • Raspberry Pi (via I2C)

  • Any microcontroller with I2C support

]]> https://hamtechtechnologies.com/product/pcf8574-expander/feed/ 0 I2C Logic Level Converter https://hamtechtechnologies.com/product/i2c-logic-level-converter/ https://hamtechtechnologies.com/product/i2c-logic-level-converter/#respond Thu, 20 Nov 2025 19:52:01 +0000 https://hamtechtechnologies.com/index.php/product/i2c-logic-level-converter/ I2C Logic Level Converter safely interfaces devices operating at different logic levels, allowing 3.3V and 5V devices to communicate seamlessly via I2C.]]> The I2C Logic Level Converter is a bi-directional 4-channel module that allows microcontrollers and peripherals with different voltage levels to communicate without damaging components. Commonly used in projects combining 3.3V boards like ESP32 or Raspberry Pi with 5V sensors, modules, and displays. Its bi-directional design ensures smooth communication across all I2C lines.

Key Features

  • 4-channel bi-directional logic level conversion

  • Supports 1:1 conversion for SDA and SCL lines

  • Compatible with I2C communication protocol

  • Works with 3.3V and 5V logic devices

  • Compact, solderless, and easy to use

Variants

  • 4-channel I2C Logic Level Converter (standard module)

  • 2-channel version (for SDA & SCL only)

Specifications

Feature Details
Channels 4 bi-directional
Input Voltage HV: 5V, LV: 3.3V
Supported Logic 3.3V ↔ 5V
Communication I2C, general logic signals
Dimensions ~30 × 17 × 3 mm

Applications

  • Interface 3.3V microcontrollers (ESP32, Raspberry Pi) with 5V I2C sensors/modules

  • Safely connect OLED displays, RTC modules, and other peripherals

  • Embedded systems requiring mixed voltage communication

  • IoT projects with multi-voltage devices

Compatible Boards / Circuits

  • Arduino Uno, Mega, Nano

  • ESP32 / ESP8266

  • Raspberry Pi / Pico

  • Any I2C-compatible device

]]> https://hamtechtechnologies.com/product/i2c-logic-level-converter/feed/ 0 BMP280 Sensor https://hamtechtechnologies.com/product/bmp280-sensor/ https://hamtechtechnologies.com/product/bmp280-sensor/#respond Thu, 20 Nov 2025 19:51:40 +0000 https://hamtechtechnologies.com/index.php/product/bmp280-sensor/ BMP280 is a high-precision sensor for measuring barometric pressure and temperature, ideal for weather stations, altitude detection, and IoT projects.]]> The BMP280 Sensor is a compact, low-power device capable of measuring atmospheric pressure and temperature with high accuracy. It communicates via I²C or SPI interfaces, making it easy to interface with microcontrollers like Arduino, ESP32, and Raspberry Pi. The sensor is widely used in weather monitoring systems, altimeters, drones, and environmental sensing projects. Its small footprint and low power consumption make it ideal for portable and battery-powered applications.

Key Features

  • Measures barometric pressure and temperature

  • High precision and stability

  • Supports I²C and SPI communication

  • Low power consumption, suitable for battery-powered applications

  • Compact and breadboard-friendly design

Specifications

Feature Details
Operating Voltage 1.8–3.6V DC
Pressure Range 300–1100 hPa
Accuracy ±1 hPa (pressure), ±1°C (temperature)
Interface I²C, SPI
Current Consumption ≤0.1 mA (typical)
Operating Temperature -40°C to 85°C
Dimensions 16 × 12 × 1 mm

Applications

  • Weather stations and environmental monitoring

  • Altitude detection in drones and RC aircraft

  • IoT environmental sensing projects

  • Smart home and agriculture monitoring

  • Educational and DIY electronics projects

Compatible Boards / Circuits

  • Arduino (Uno, Nano, Mega)

  • ESP32 / ESP8266

  • Raspberry Pi (via I²C/SPI)

  • Can interface with displays, data loggers, and cloud platforms

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