LED-Strip-Giant-7-Segment-Display

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LED Strip Giant 7‑Segment Display

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Working sample

This project describes a simple DIY giant 7‑segment display built from low‑cost LED strips and perfboard.
The goal is to get a large, clearly visible digit with minimal components and manufacturing effort.

Specifications

Supply voltage: 5 V
Segment current: 90 mA (green COB LED strip)
Digit size: 145 × 65 mm (overall dimensions of one segment digit)

LED Segments

Each segment is a piece of green COB LED strip, 50 × 8 mm in size, mounted on double‑sided adhesive tape.
The COB (Chip‑on‑Board) technology places many LED chips very close together and encapsulates them in a single layer of compound, producing a continuous, uniform line of light along the entire segment.

Construction

Segments are attached to a copper‑clad or perfboard substrate using their adhesive backing and then wired as a classic 7‑segment digit (one common node and 7 individually driven segments).
The layout is optimized for easy hand‑soldering and uses only through‑hole wiring, with no need for a custom PCB.

Advantages

Low cost: All parts are standard and inexpensive (generic COB LED strips, perfboard, and a few wires), so the total price of one digit is much lower than a factory‑made large 7‑segment module of similar size.
Simplicity: No special manufacturing is required; the digit can be assembled with basic tools and a soldering iron, making it suitable for hobby projects, prototypes, or educational use.
Uniform light: Thanks to COB technology, each segment emits an even bar of light without visible individual LEDs, improving legibility and aesthetics of the digit.
Scalability: Several digits can be combined into multi‑digit displays (clocks, counters, scoreboards) by repeating the same construction.

DP Segment

You won't see the 5mm green LED in the photo, which is the DP segment, because I haven't installed it yet. Take the LED, find its rated current, and multiply it by 0.7. Calculate the resistance of the current-setting register using the formula: R = (Vcc - Vled) / Iled. In the formula, voltage is in volts, current is in amperes, and the result is in ohms.

Comments

LED Strip Giant 7‑Segment Display

Working sample

Specifications

Supply voltage: 5 V

Segment current: 90 mA (green COB LED strip)

Digit size: 145 × 65 mm (overall dimensions of one segment digit)

LED Segments

Each segment is a piece of green COB LED strip, 50 × 8 mm in size, mounted on double‑sided adhesive tape.

The COB (Chip‑on‑Board) technology places many LED chips very close together and encapsulates them in a single layer of compound, producing a continuous, uniform line of light along the entire segment.

Construction

Segments are attached to a copper‑clad or perfboard substrate using their adhesive backing and then wired as a classic 7‑segment digit (one common node and 7 individually driven segments).

The layout is optimized for easy hand‑soldering and uses only through‑hole wiring, with no need for a custom PCB.

Advantages

Low cost: All parts are standard and inexpensive (generic COB LED strips, perfboard, and a few wires), so the total price of one digit is much lower than a factory‑made large 7‑segment module of similar size.

Simplicity: No special manufacturing is required; the digit can be assembled with basic tools and a soldering iron, making it suitable for hobby projects, prototypes, or educational use.

Uniform light: Thanks to COB technology, each segment emits an even bar of light without visible individual LEDs, improving legibility and aesthetics of the digit.

Scalability: Several digits can be combined into multi‑digit displays (clocks, counters, scoreboards) by repeating the same construction.

DP Segment

You won't see the 5mm green LED in the photo, which is the DP segment, because I haven't installed it yet. Take the LED, find its rated current, and multiply it by 0.7. Calculate the resistance of the current-setting register using the formula: R = (Vcc - Vled) / Iled. In the formula, voltage is in volts, current is in amperes, and the result is in ohms.

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