Photosensitive Robot Kit
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Build a simple robot that moves towards light...
Build two and you can enjoy racing them with friends!
This kit is perfect for beginners who want to explore electronics, soldering, and robotics. With clear step-by-step assembly instructions, it uses only through-hole components designed for easy soldering. It’s a fun first step into the world of DIY robotics. Great as a gift for kids, teens, or adults who love building and learning how technology works.
After you enjoy the assembly process, watch in amazement as your robot moves toward a flashlight or lamp, following the glow with its “eyes” (photoresistors) while its blue LED tail simulates a magical firefly effect. Experiment by adjusting the light source and the configuration of your robot to optimise how it moves—race your robot against your friends.
Start small. Learn real STEM skills. Build confidence. And when your robot follows the light, you’ll know you made it happen. Refer to the dropdown sections below for more product information.
What's Included?
What's Included?
Includes all components required to build the Photosensitive Robot:
- Printed circuit board (PCB)
- LM358P integrated circuit
- DIP-8P IC socket
- Transistors:
- S8550 (x2)
- S9014 - Blue LED “firefly” tail light
- Mini vibrating motors (x2)
- 100 µF electrolytic capacitor
- Light-dependent resistors (LDRs) x2
- Potentiometer
- Resistors:
- 100 Ω (x2)
- 430 Ω (x2)
- 1.5 kΩ
- 3.3 kΩ
- 10 kΩ (x2) - Toggle switch
- Connection pins (x6)
- Coin battery clip*
- Heat-shrink tubes (x2)
- PVC support frame
- Sheathed copper wire
- Adhesive pads (x2)
Refer to the image gallery for photographs of each component.
* CR2032 battery required, not included
Learning Outcomes and Benefits
Learning Outcomes and Benefits
This is a fun project and serves as a great introduction to electronics and robotics, especially for kids. Some of the learning benefits from assembling this kit include:
Electronics Basics: Learn how resistors, transistors, capacitors, integrated circuits, and photoresistors work together on a PCB to form a working circuit. Our detailed instruction manual has a technical section that explains what each component is and how they all work together to produce the photosensitive robot. The manual also contains the circuit diagram.
Soldering Skills: Practice safe soldering on beginner-friendly through-hole components. Build confidence for future DIY electronics and repair projects.
Sensor Technology: Understand how light-dependent resistors act like “eyes,” letting the robot respond to its environment.
Robotics Fundamentals: Explore how electronic inputs (light) can trigger outputs (motion), the core of robotics and automation. This will help gain an appreciation for how many of today's modern convenience electronics work.
Problem-Solving & Creativity: Experience troubleshooting and hands-on building while learning to think like an engineer.
STEM Integration: Strengthen knowledge across Science, Technology, Engineering, and Math (STEM) by combining theory with practice.
Experimental Method: Try changing variables such as light colour, brightness, and distance, adjust the angle of the LDRs, tweak current flow with the potentiometer, or reposition the robot’s “feet” to test how movement changes. This hands-on experimenting helps learners think like scientists and engineers by finding the best combination for optimal robot behaviour.
Gateway to Advanced Projects: Builds the foundation for moving into more advanced robotics, coding, and electronics projects.
Frequently Asked Questions (FAQ)
Frequently Asked Questions (FAQ)
Q: Do I need prior experience with electronics?
A: No! This photosensitive robot kit is designed for beginners. Step-by-step instructions and easy-to-handle through-hole electronic components make it an ideal first project.
Q: How does the robot move without wheels?
A: The robot uses two vibrating motors that cause the feet to vibrate, which produces motion. These little motors are the same marvels that make your mobile phone vibrate when someone rings it or you get a notification.
Q: Does it really “follow” light?
A: Yes! Shine a light source on it, and the robot will track and move toward the light source. It works by detecting the light received by the LDRs and then vibrating whichever of the two motors (or both at the same time) to ensure it's always moving towards the light.
Q: Does this kit require programming?
A: No coding is needed. The robot’s movement is controlled entirely by the electronic circuit, making it simple and fun to build.
Q: Can I reuse the components for other projects?
A: Yes, if you’re careful when disassembling. The components are standard through-hole parts that can be used in other DIY electronics projects, such as Arduino projects.
Product Specifications
Product Specifications
Dimensions (approx., when completed):
- Height: varies from 2.0-6.0 cm (depending on how you position the LDRs and feet).
- Diameter: 4.5 cm
PCB Type: through-hole components.
Power Supply: 3V DC supplied by 1 x CR2032 coin battery (not included, but available from any shop that sells batteries).
Assembly and Usage Info
Assembly and Usage Info
Anyone can build this Photosensitive Robot kit following our detailed step-by-step instruction manual which can be downloaded from the link below. The password to open the manual was sent to the same email that you placed your order from. Can't find it? Just Contact Us!
Download: Photosensitive Robot Electronics Kit Instruction Manual
Skill Level: Beginner
Age Rating: 12+ (adult supervision required for under 16's)
Assembly Time: Typically 2-4 hours
Tools and Materials Required
Tools and Materials Required
Tools required for this kit
- Soldering iron
- Solder wire
We sell these items as a bundle for just €25.95 (or currency equivalent) which saves 10 percent! Just click the link below to select your countries plug type and add to your order.
SOLDERING IRON & WIRE BUNDLE
Of course, you only need to buy the tools once; you'll use them again and again for your future electronics projects!
Links and References
Links and References
Our blogs & videos related to electronics kits:
Ultimate Guide to Electronics Kits
Youtube video: Tools, tips and tricks for soldering electronics kits
Other useful links:
An overview of the Light Dependent Resistors used in this kit
Shipping and Warranty Info
Shipping and Warranty Info
Shipping Information
Orders are processed and dispatched within 1–2 business days. Typical delivery times for this product, depending on region are:
- EU: 7-14 days
- UK: 5-12 days
- US / Canada: 6-11 days
- Australia: 7-14 days
All orders are shipped with tracking, where available. Please refer to our Shipping Policy page for further detail.
Warranty & Satisfaction Guarantee
All electronics kits come with a 14-day satisfaction guarantee. If you're not happy with your purchase, contact us and we’ll arrange a refund or replacement — no hassle. Please note that to qualify for a replacement or refund, kits must be in their original, unused condition. Please refer to our Returns and Refunds policy for more information.
Packaging
We aim to minimize waste while protecting your order. All electronic kits are securely packaged in padded mailing bags containing anti-static ESD bags and/or rigid plastic boxes (depending on the product) to ensure the safety of the electronic components. An example of electronics kit packaging can be viewed HERE. If you're purchasing this item as a gift and would rather that it was in a box, we also sell quality gift boxes at the following link: Quality Gift boxes.
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Ships from: International Warehouse
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Great learning project for beginners. I am not a beginner but I still had fun making the kit. Thank you!
Hi Michael, thank you so much for taking the time to write a review, we really appreciate it. Glad to hear you enjoyed assembling the kit... it is a quirky little project with the inclusion of the tiny vibrating motors; we haven't seen too many kits that use these, aside from other ones similar in nature to this one.
Most if my parts came smashed. The IC leads were bent. Other electronic were bent ir broken..like they just threw the parts in the bag.
Hello Vincent. Thanks for your purchase and sorry to hear you were not satisfied. If you had contacted us with your concerns, we'd have made it 100% right and completly to your satisfaction; we always do. And of course, we still will make it right if you wish - just email info@thesciencehut.com and we'll look after you there.
With respect to the components being bent, they all include long, thin wire stems which are very easily bent during shipping and handling, but this in no way affects their functionality. Indeed, the bent stems are snipped off and thrown away as part of the assembly. We pack the components into bags and ship them in bubble-wrapped padded mailing bags which are more than adequate for these types of products. If we were to pack in a protective box (which is completely unnecessary), the customer would end up with a higher cost for the product and most likely have to pay for shipping too. The way this product is packed means we can sell it for only $14.95 and include free shipping for that low price. We want to keep our prices as low as possible because we want to make our products easily accessible for anyone interested in learning about science. Avoiding inflating prices with unnecessary packing costs helps us to do that.
As mentioned earlier, feel free to reach out to our customer support email above if you wish, they are there to help you.
Only took my 14 year old son about an hour to assemble this and it works great. If you're looking for a good starter electronics kit, I highly recommend this one. You can angle the two photoresistors in different ways to change the way the robot reacts to light. Great fun to play with.
Great soldering project, not too difficult to assemble. It's amazing what you can do with so few basic electronics components. This little robot almost seems intelligent the way it 'sees' and moves towards a light source. Loving these STEM Electronics kits!