PEMENOL 2 Pack DIY Soldering Robot Kit - STEM Science Project for Adults, Light Sensitive Firefly Flash Toy - Perfect for Electronics Hobbyists & STEM Education

This is about the Photosensitive Mobile Robot Electronic Soldering DIY Kit.It is an cute little kit that could help a child develop a few skills like following instructions and soldering. It can take a bit of supervision, though. For instance, my daughter mixed up some transistors: there are two types and they look the same, you got to read the small prints.Reworking was beyond a kid's capabilities.This kit is pure assembly and does not involve creative skills, unless you break something or do something wrong and need to repair.The instructions are online and are clear.The main flaw I found is in step 17 (see picture) : they say the wires should be shortened to 5mm, but they are so thin that it is almost impossible to shorten them, strip them, without breaking over and over again, and ending up with at least one unusable motor.This is what happened to me, so I could only build one out of the two kits.I suggest to neglect this instruction and leave the wires longer, however when you stick them to the leg, try to respect an equal distance and close to the top of the legs.Once assembled correctly, it works.All it does is slowly turning toward the photo resistor that is exposed to a light source.This light source needs to be quite strong, like a powerful flash light, not too far.It is probably measuring the difference between the right and left sensors, so it is better to use in the dark.It needs to be set on a slick surface for the motion to happen via the vibrations.If your flash light is not aligned with any sensor, it does not move, and this is probably the main flaw of this design: it lacks a sensor on its back that detects any light around, stronger than the light in the sensors, so that it would then turn and align itself.So all you can do is flash the light in the sensors and move slowly as it moves along, slowly.You can play with the legs angle and see what works best: I found that quite straight is better, but either way the rotation is uncertain and often it is more drifting than turning.