This instruction is to make a HEXBUG nano to be activated by light.

HEXBUG nano is a fun toy which moves like a real bug. I want to use it to surprise someone who open the box contain a dozen of the HEXBUG nano. But the HEXBUG have only a toggle switch for activation, so the bugs cannot hide silently in the box.

We can add a photo switch to activate the bugs only when they come to bright place. It works well, and the modification doesn't change the look of HEXBUG nano.

It is very simple circuit, but little difficult when you solder SMD transistors. Check the schematics.


Step 1: What you need

You need below stuffs:

1. A HEXBUG nano
You need the HEXBUG nano. I recommend the one which has clear window on the top.

2. SMD Transistor
I have tried 2SC4116 and 2SC3325. 2SC3325 is better because it has bigger body and larger collector current.

3. Photo diode
I used PS1101W.

4. A design knife
You need it to uncover the bug.

5. A screw driver (+)
You need it to remove battery cover.

6. Soldering iron and solders
You need them to build the circuit.

7. A tweezer
The parts is very small. You need it.

8. A mini knipper
You need it to cut off the wire of the toggle switch.

9. A double sided tape
You may need it to hold parts when you solder them.

10. A instant glue
You need it to bond the bug's cover and body.
Hi, <br>Thanks for your reply. <br>Since then I tried two tranzistors: <br>BC 817-40 <br>KP-2012P3C (phototranzistor) <br>The bug is sleeping well but it need more light to wake up. <br>And unfortunatelly it is slower. <br>I am thinking about to change the battery to 3.0V <br>Best Regards, <br>PI
Dear longjie! <br>In Europe I don't able to by a PS1101W phototranzistor. <br>Please give me an advice which parameters did you search to this project. <br>Which parameter of the phototranzistor is important for the right functioning. <br>Thank you for your help! <br>Best regards, <br>PI
Hi,<br><br>I'm mot sure. I guess most photodiode will work.<br>The size of the chip may be matter when you build.<br><br>Thanks,<br><br>
This is so awesome !!! You managed to do that is such little space !!!! I just made a modular vibrating robot here, so you could use bigger electronics : <a href="http://www.instructables.com/id/How-to-build-your-Modular-Vibrating-Robot/" rel="nofollow">http://www.instructables.com/id/How-to-build-your-Modular-Vibrating-Robot/</a><br> <br> <div class="media_embed"> <a href="http://www.instructables.com/id/How-to-build-your-Modular-Vibrating-Robot/" rel="nofollow"><iframe frameborder="0" height="315" src="http://www.youtube.com/embed/ELB-XPDBOFI" width="560"></iframe></a></div>
awesome man....i want to make one.......btw one of the hexbugs was squashed like a bug^^hehe
I love hexbugs!
mee too!
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Wow, that's a really neat hack. <br><br>Does the toggle switch still work (to save the battery between tricks)?
Of course yes! Oh, sorry I forget to attach schematics.
I see it now - good job.
Thank you!

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