Adafruit 1269/1270 1.2" 4-Digit 7-Segment Display w/I2C Backpack (Yellow / Red)

The Adafruit 1269/1270 is a bright 1.2-inch 4-digit 7-segment LED display module with an integrated I2C backpack that simplifies microcontroller integration by reducing GPIO pin requirements from 12 to just 2 (SDA and SCL). Electronics engineers, IoT developers, and hobbyists use this display for real-time data visualization in projects requiring minimal wiring complexity and maximum code simplicity. This product solves the critical problem of pin scarcity on microcontroller boards while delivering high-brightness numerical output for industrial monitoring systems, digital clocks, temperature displays, and data logging applications.

Product Overview

The Adafruit 1269/1270 combines a high-brightness common-cathode 7-segment LED display with an HT16K33 LED driver IC on the backpack board. The HT16K33 communicates via I2C protocol at standard addresses (0x70 default), managing all 28 LED segments (4 digits × 7 segments) through a single 16-bit shift register architecture. The display operates at 5V with typical current draw of 200mA at full brightness, featuring adjustable brightness control through software commands. The yellow variant (1269) and red variant (1270) offer different color options for application-specific visibility requirements, with character height of 1.2 inches providing excellent readability from 2-3 meters distance in ambient lighting conditions.

The backpack eliminates the need for complex multiplexing code by handling all timing and segment control internally. The I2C interface operates at standard 100kHz or fast 400kHz speeds, compatible with Arduino, Raspberry Pi, STM32, and any microcontroller with I2C support. Built-in colon and decimal point LEDs enable time display and decimal number representation. The module includes 0.1-inch spaced header pins for breadboard integration and accepts 5V power with integrated voltage regulation for the LED driver circuit. Adafruit provides comprehensive Arduino libraries with pre-written functions for number display, decimal positioning, and brightness adjustment, reducing development time significantly.

Key Specifications

Specification	Details
Product Type	4-Digit 7-Segment LED Display with I2C Backpack
Brand	Adafruit Industries
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Display Size	1.2 inches character height
LED Type	Common-cathode 7-segment with decimal points and colon
Driver IC	HT16K33 16-bit LED controller
Communication Protocol	I2C (100kHz or 400kHz)
Operating Voltage	5V DC
Current Draw	200mA typical at full brightness
Color Options	Yellow (1269) or Red (1270)
I2C Address	0x70 default, configurable via solder bridges

Key Features

• I2C Communication: Requires only 2 GPIO pins (SDA, SCL) instead of 12, preserving microcontroller resources for other functions and simplifying PCB layout design
• High Brightness LEDs: 1.2-inch tall characters deliver excellent visibility in daylight and indoor environments up to 3 meters distance with adjustable software brightness control
• Integrated Colon and Decimal Points: Built-in LED segments for time display (HH:MM format) and decimal number representation without additional wiring
• Pre-written Arduino Library: Adafruit provides complete software stack with functions for number display, decimal positioning, brightness adjustment, and blinking control
• Breadboard Compatible: 0.1-inch spaced header pins enable direct insertion into standard breadboards for rapid prototyping without soldering
• Multiple I2C Addresses: Configurable via solder bridges allowing up to 8 displays on single I2C bus for multi-digit applications

Applications and Use Cases

• Digital Clock Modules: Display hours and minutes with colon separator in Arduino-based alarm clocks, desk clocks, and wall-mounted time displays requiring minimal wiring
• Temperature Monitoring Systems: Real-time temperature readout in laboratory equipment, HVAC systems, and industrial process control where I2C sensors connect directly to the display backpack
• Frequency Counter Displays: Show frequency measurements in electronic test equipment and amateur radio projects with automatic decimal point positioning for MHz or kHz ranges
• Industrial Data Logging: Display sensor readings, production counts, or error codes in factory automation systems where multiple displays require individual I2C addresses on shared bus
• Educational Robotics: Teach microcontroller programming and I2C protocol fundamentals using visual feedback with minimal code complexity compared to direct GPIO multiplexing
• Battery Voltage Monitoring: Display DC voltage readings from power supplies and battery systems in portable equipment with adjustable brightness to reduce power consumption

How to Use

Connect the display to your microcontroller using I2C protocol: wire the GND pin to ground, VCC to 5V, SDA to the microcontroller's SDA pin (Arduino A4 on Uno, GPIO 20 on Raspberry Pi), and SCL to the microcontroller's SCL pin (Arduino A5 on Uno, GPIO 21 on Raspberry Pi). Install the Adafruit LED Backpack library via Arduino IDE Library Manager or download from GitHub. Initialize the display in your code with Adafruit_7segment display; display.begin(0x70); then use display.print(1234); to show a 4-digit number, display.writeDisplay(); to update the physical display, and display.setBrightness(15); to set brightness from 0-15.

For decimal point control, use display.writeDigitNum(position, value, decimal_point_flag); where position ranges 0-3 (left to right). The colon is controlled separately with display.drawColon(true/false);. Adjust I2C address by soldering bridge pads on the backpack if connecting multiple displays to the same bus. The display updates via I2C at 400kHz speed, allowing refresh rates up to 100Hz without blocking other operations. Refer to Adafruit's comprehensive documentation and example sketches for advanced features like dimming animations and multiplexed data display from multiple sensors.

Frequently Asked Questions

Can I connect multiple Adafruit 1269/1270 displays to one microcontroller?

Yes, up to 8 displays can be connected to the same I2C bus by configuring different I2C addresses through solder bridges on each backpack. Each display has address selection pads labeled A0, A1, A2 that can be soldered to change the default 0x70 address. This allows you to control 32 total digits from a single microcontroller using just 2 GPIO pins.

What is the difference between Adafruit 1269 (Yellow) and 1270 (Red)?

The only difference is the LED color: model 1269 features yellow LEDs while model 1270 features red LEDs. Both have identical electrical specifications, I2C backpack functionality, brightness, and software compatibility. Choose based on your application's visibility requirements and aesthetic preferences.

Does this display work with 3.3V microcontrollers like Raspberry Pi or Arduino Due?

The display itself requires 5V power for proper LED brightness. However, the I2C logic levels are tolerant of 3.3V signals from the microcontroller pins. Connect VCC to 5V, GND to common ground, and the SDA/SCL lines directly to your 3.3V microcontroller. The HT16K33 driver IC accepts 3.3V I2C signals while driving 5V LEDs, making it compatible with both 5V and 3.3V systems.

What is the maximum brightness and can it be dimmed?

The display has 16 brightness levels (0-15) controlled via the setBrightness() function. Level 15 is maximum brightness consuming approximately 200mA at full display load. You can reduce brightness to save power in battery-powered applications or to reduce light pollution in dark environments. Brightness can be adjusted in real-time without restarting the microcontroller.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
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• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
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• Returns: 7-day return policy on manufacturing defects only

Buy Adafruit 1269/1270 1.2" 4-Digit 7-Segment Display w/I2C Backpack (Yellow / Red) Online in India

Purchase the Adafruit 1269/1270 1.2" 4-Digit 7-Segment Display w/I2C Backpack (Yellow / Red) online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Adafruit