How many pieces are in the Light Sensor 9V?

Light Sensor 9V contains 1 pieces.

When was the Light Sensor 9V released?

Light Sensor 9V was released in 1999.

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No. 9758

RCX

Light Sensor 9V

The Light Sensor 9V is a foundational element for LEGO robotics.

Time on the shelf Retired

Released Jan 1999

View on eBay

Before you buy

Who it's for: Beginner build Ideal for LEGO robotics enthusiasts and those expanding their RCX system.
Build: 1 pieces · about 0.1 hours Build time is an estimate.
Cost: Budget Next to other LEGO sets. Check the store for today's price.
Availability: Likely retired

★★★☆☆ 3.8 AI-generated review score, not a customer rating

Fans appreciate the Light Sensor 9V for enabling advanced functions with the RCX system, though it's acknowledged as a niche item only useful within that specific ecosystem. Its simplicity is both a strength and a limitation.

📝 Our Take

The Light Sensor 9V is a foundational element for LEGO robotics. Released in 1999 as part of the RCX (Robotics Command System) line, this sensor allowed LEGO creations to interact with their environment by detecting light levels, opening up possibilities for autonomous behavior and complex programming.

This set is perfect for LEGO enthusiasts interested in robotics and programming. While it contains only a single piece, its value lies in its functionality and compatibility with the RCX system, offering a unique way to expand the capabilities of LEGO creations.

Skip this if you're not interested in LEGO robotics or the RCX system. This sensor is specifically designed for use with the RCX brick and related components, and it won't be of much use for general LEGO building or display purposes. Consider LEGO Boost or Mindstorms for more modern robotics options.

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How does the Light Sensor 9V compare to modern LEGO light sensors? What are some creative ways to use the Light Sensor 9V in LEGO projects? Is the Light Sensor 9V compatible with other LEGO robotics systems? Where can I find programming resources for the Light Sensor 9V?

🧱 Building Experience

🧩

Pieces

⏱

0.1h

Estimated Build Time

📊

Beginner

Difficulty

Build Highlights:

Simple integration with the RCX brick
Enables light-sensitive programming
Durable and reliable sensor
Expands the functionality of LEGO robots

📈 Investment Analysis

→ Price stable

C+

Investment Grade

Retired

As a retired LEGO element, the Light Sensor 9V holds some investment potential, particularly for collectors of vintage LEGO robotics components. Its value is tied to the RCX system, which enjoyed a period of popularity and continues to have a dedicated following. While not a high-value item, its rarity and specific use case contribute to its collectibility. The price remains relatively stable, suggesting consistent demand from those looking to complete or expand their RCX sets. However, the niche nature of robotics and the availability of newer alternatives may limit its long-term appreciation.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

Boost Creative Toolbox

Boost • 847 pcs

The Light Sensor 9V is unique to the RCX system and doesn't have direct modern equivalents. While newer LEGO robotics sets like Mindstorms and Boost offer light sensors, they are not compatible with the RCX brick. This makes the Light Sensor 9V essential for those working with the older RCX platform. It's a simple but crucial component for enabling light-based interactions in LEGO creations from that era.

📦 Parts Inventory

Official piece count: 1
Parts cataloged in this inventory: 1 unique parts, 1 pieces

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

The set consists of a single, specialized light sensor. Its value lies in its functionality rather than its building potential.

🛒 Where to Buy

eBay

Search listings

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💎 Notable Parts

Blue Sensor, Light with Fixed Cable (1x)

💡 MOC Potential

🤖 Integrate into custom robotic creations for light-sensitive behaviors

🏙 Create automated streetlights or traffic signals for LEGO city layouts

🌳 Design light-activated plant watering systems (requires additional parts)

From the community

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 8 videos

3.0/5

Mixed

0% positive

BlockTalk summary

The LEGO Light Sensor 9V (9758-1) receives neutral attention in the YouTube community, with content ranging from basic tutorials to integration with Arduino. While not heavily praised or criticized, the sensor's functionality in various LEGO projects like trains and Mindstorms is showcased.

YouTube thumbnail: Arduino for Lego Trains #2: Light Sensors

Arduino for Lego Trains #2: Light Sensors Arduino Lego Trains · 124.7K views Review

YouTube thumbnail: Hands on with the new LEGO Smart Brick! 👀

Hands on with the new LEGO Smart Brick! 👀 iJustine · 31.5K views Review

YouTube thumbnail: Lego Color & Distance Sensor | A miracle solution for your Lego train or complex garbage?

Lego Color & Distance Sensor | A miracle solution for your Lego train or complex garbage? Jason’s Bricks in 5 · 4.4K views Review

Community Sentiment

Based on 8 YouTube reviews

Not enough Reddit data

YouTube

3.0/5

Mixed

0% positive

Positive: 0
Mixed: 8
Critical: 0

BlockTalk analysis

What the Community Says

3 YouTube reviews

BlockTalk summary

Lucas-Dynamics' video serves as an introduction to LEGO Technic, while Arduino Lego Trains demonstrates wiring the sensor to stop a LEGO 9V train using an Arduino Mega. Jason’s Bricks in 5 questions its utility for LEGO cities, highlighting the mixed reception towards its practical applications.

Reddit Reviews

No Reddit reviews found

YouTube Reviews

3 videos

Arduino for Lego Trains #2: Light Sensors Arduino Lego Trains · 124.7K views Review

Hands on with the new LEGO Smart Brick! 👀 iJustine · 31.5K views Review

Lego Color & Distance Sensor | A miracle solution for your Lego train or complex garbage? Jason’s Bricks in 5 · 4.4K views Review

Community content: these reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

Inventory Statistics

Inventory version 1

1 Unique Parts

1 Official Piece Count

1 Cataloged Inventory Pieces

0 Minifigures

Missing a piece? Use the Missing Piece Checker.

Light Sensor 9V