Sense the World!
Add the Light Sensor 9V to your RCX

Expand your LEGO Mindstorms creations with this 1999 RCX sensor. Detect light and bring your robots to life!

🏛 RCX
Set #9758

Light Sensor 9V

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

🏆 Best For: Ideal for LEGO robotics enthusiasts and those expanding their RCX system. ⏱ 0.1 hr build 🧩 1 pcs
★★★☆☆ 3.8

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.

MSRP
$19.75
Best Price
$17.78
You Save
10% OFF
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📝 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

🧩
1
Pieces
0.1h
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
⏳ Active
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

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.

📦 Full Parts Inventory - 1 unique parts • 1 total pieces

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

🛒 Where to Buy

eBay
✓ In Stock
$17.78
Walmart
✓ In Stock
$18.76
Target
✓ In Stock
$19.75
Amazon

💎 Notable Parts

Blue Sensor, Light with Fixed Cable (1x) $19.99
Est. BrickLink Part Value
$19.99

💡 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)

📰 RCX News

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 9 videos
3.0 /5
Mixed
0% positive
BlockTalk AI

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.

Community Sentiment

Based on 9 YouTube reviews

Reddit

Not enough Reddit data

YouTube

3.0 /5
Mixed
0% positive
0
Positive
9
Mixed
0
Critical
BlockTalk AI Analysis

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.

What the Community Says

3 YouTube reviews
BlockTalk AI 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.

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

Charts Inventory Statistics

1
Unique Parts
1
Total Pieces
0
Minifigures
Inventory Version: 1