The school where I tutor the IoT Club has an IT/Technology bias. They have 3D printers and a laser cutting machine as well as 3D modelling programs, so some of the students are quite knowledgeable about hardware. I'm very careful at letting them wire-up things and they appreciate I need to check it before they plug things in. As everything is driven off of USB 5V power it is a fairly safe environment. Also using Wemos D1 Mini (ESP8266-based microcontrollers) are very in-expensive - probably 2 Euros each, so if a student did accidently destroy one - it's not the end of the world. Having said that - I've been running the club for nearly 4-years and the only disaster we have had is a lead/leg got broken off of an LED.
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