IC chip – Hamtech Electronics Technologies

PCF8574 Expander

admin — Thu, 20 Nov 2025 19:52:04 +0000

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

MCP3008 ADC

admin — Thu, 20 Nov 2025 19:52:04 +0000

The MCP3008 is a versatile 8-channel 10-bit ADC that communicates via SPI protocol. It enables microcontrollers with limited analog inputs to read multiple analog sensors such as temperature sensors, potentiometers, light sensors, and more. This module is widely used in IoT, robotics, and embedded electronics projects requiring analog data acquisition.

Key Features

8 analog input channels (CH0–CH7)
10-bit resolution (0–1023)
SPI communication interface for easy integration
Operates at 2.7V–5.5V
Low power consumption, suitable for battery-powered projects
Compatible with Arduino, ESP32, ESP8266, Raspberry Pi

Variants

MCP3008 Standard SPI ADC Module
MCP3008 with breadboard-friendly pins

Specifications

Feature	Details
ADC Channels	8
Resolution	10-bit
Interface	SPI (MISO, MOSI, SCK, CS)
Operating Voltage	2.7V – 5.5V
Sample Rate	Up to 200 ksps
Package	DIP-16 (for module)

Applications

Reading multiple analog sensors
IoT sensor data acquisition
Robotics and automation systems
Microcontroller-based measurement systems
Educational and DIY electronics projects

Compatible Boards / Circuits

Arduino Uno, Mega, Nano
ESP32 / ESP8266
Raspberry Pi (via SPI)
Any SPI-compatible microcontroller

20×4 LCD

admin — Thu, 20 Nov 2025 19:51:51 +0000

The 20×4 LCD Module is a popular alphanumeric display module based on the HD44780 controller, capable of displaying 20 characters per line on 4 lines. It supports 4-bit or 8-bit parallel communication and can be interfaced directly with microcontrollers using digital I/O pins or via I2C with an adapter. It is widely used in DIY electronics, IoT, robotics, and embedded systems for displaying text, sensor readings, system status, and menus. Its backlight provides clear visibility in low-light conditions, and it’s compact enough for integration into custom enclosures.

Key Features

20 characters × 4 lines display
HD44780 or compatible controller
Backlight for better visibility
Supports 4-bit and 8-bit parallel interface
Compatible with Arduino, ESP32, and Raspberry Pi
I2C interface available with adapter for simplified wiring

Variants

Standard 20×4 LCD (parallel interface)
20×4 LCD with I2C adapter (simpler connection)

Specifications

Feature	Details
Display Type	20×4 Alphanumeric
Controller	HD44780 / Compatible
Interface	4-bit / 8-bit parallel (I2C optional)
Operating Voltage	5V DC
Backlight	Yes (LED)
Character Size	5 × 8 dots
Dimensions	85 × 50 × 12 mm

Applications

Arduino, ESP32, and Raspberry Pi projects
Sensor data display (temperature, humidity, etc.)
Menu-driven interfaces for embedded systems
Robotics and automation feedback screens
DIY IoT dashboards and monitoring systems

Compatible Boards / Circuits

Arduino Uno, Mega, Nano
ESP32 / ESP8266
Raspberry Pi (GPIO or I2C)
Any microcontroller supporting 4-bit/8-bit or I2C LCD communication

0.96 OLED 128×32- Blue

admin — Thu, 20 Nov 2025 19:51:47 +0000

The 128×32 Blue OLED Display offers sharp contrast, low power consumption, and excellent readability. With I²C communication, it connects easily to Arduino, ESP32, Raspberry Pi, and STM32.
This mini display is perfect for small dashboards, sensor readouts, battery monitors, and compact electronics.

Key Features

128×32 pixel resolution
Blue OLED for high contrast
I²C interface
Low power consumption
Wide viewing angle
Supports Arduino, ESP32, Raspberry Pi

Specifications

Feature	Details
Resolution	128×32
Color	Blue
Interface	I²C
Voltage	3.3V–5V
Size	0.91 inch (typical)
Technology	OLED

Applications

Sensor data display
IoT devices
Battery monitors
Compact UIs
Wearable electronics

HX711 Amplifier

admin — Thu, 20 Nov 2025 19:51:45 +0000

The HX711 Amplifier Module is a high-precision 24-bit ADC designed specifically for weight measurement systems. It interfaces easily with load cells and microcontrollers, making it the industry standard for digital weighing scales and force measurement systems.
Its low noise, stable output, and simple 2-wire interface make it ideal for ESP32, Arduino, and Raspberry Pi projects.

Key Features

24-bit precision ADC
Dual-channel input (A & B)
Works with 1–5kg, 20kg, 50kg load cells
Simple 2-wire interface
Low noise and stable reading

Specifications

Feature	Details
ADC Resolution	24-bit
Channels	Channel A (gain 128), Channel B (gain 32)
Voltage	2.7–5V
Interface	Digital
Output	Serial Data + Clock

Applications

Digital weighing scales
Load measurement systems
Smart weighing IoT devices
Force sensors
Industrial measurement

ULN2003 Darlington Driver IC

admin — Thu, 20 Nov 2025 03:28:24 +0000

The ULN2003 is a versatile 7-channel NPN Darlington transistor array designed to interface microcontrollers—such as Arduino, ESP32, ESP8266, and Raspberry Pi—with high-current and high-voltage loads. Each of the seven channels can sink up to 500mA, making it suitable for driving relays, indicators, lamps, solenoids, and especially stepper motors such as the 28BYJ-48.

The IC includes integrated flyback diodes, offering built-in protection when switching inductive loads. It accepts both 3.3V and 5V logic, making it perfect for modern embedded systems. The ULN2003 is widely used in automation systems, robotics, vending machines, automotive projects, and industrial control circuits.

Key Features:

7-channel NPN Darlington driver
Up to 500mA current sinking per channel
Handles load voltages up to 50V
Built-in freewheeling diodes for inductive protection
Compatible with 3.3V/5V logic
Ideal for stepper motors, relays, solenoids, LED drivers
Companion to shift registers (74HC595) and microcontrollers

ULN2803A Darlington Transistor

admin — Thu, 20 Nov 2025 03:22:39 +0000

The ULN2803A is a highly popular 8-channel Darlington transistor array designed to interface low-current logic systems (Arduino, ESP32, Raspberry Pi) with higher current/voltage loads. Each of its eight channels contains a Darlington pair capable of sinking up to 500mA per channel, making it ideal for relay boards, LED strips, stepper motors, and solenoid control.

The chip features integrated flyback diodes, allowing safe operation with inductive loads such as relays and motors without needing additional protection components. The ULN2803A accepts both 3.3V and 5V logic, making it widely compatible across microcontroller platforms.

Common applications include relay driving circuits, stepper motor control, LED displays, home automation, robotics, vending machines, and industrial automation.

Key Features:

8-channel NPN Darlington transistor array
Up to 500mA per channel
Supports load voltages up to 50V
Built-in flyback diodes for inductive loads
TTL/CMOS compatible inputs
Ideal for relays, motors, LEDs, solenoids, and displays
Direct companion to shift registers like 74HC595

HC595 Shift register

admin — Wed, 19 Nov 2025 04:04:20 +0000

The 74HC595 Shift Register is a high-speed CMOS device used to expand digital output pins using only 3 microcontroller pins. It features an 8-bit serial input and a parallel output latch, enabling efficient control of multiple outputs such as LEDs, 7-segment displays, relays, and more.

By daisy-chaining multiple 74HC595 chips, you can scale up your output capacity to dozens or even hundreds of pins. The device operates from 2V–6V, making it compatible with most logic-level microcontrollers. It includes storage registers, output latches, and tri-state outputs for stable and reliable operation.

Ideal for LED matrices, display driving, multiplexing projects, and automation circuits.

Key Features:

8-bit serial-in, parallel-out shift register
Operates on 2V to 6V
High-speed CMOS technology
Cascade/daisy-chain support
Low power consumption
Tri-state outputs
Compatible with Arduino, ESP32, ESP8266, Raspberry Pi