Code with BLOCKS : https://makecode.microbit.org/#
conductivity meter: conductivity-tester code
magnetic strength : https://learn.adafruit.com/micro-bit-lesson-1-using-the-built-in-sensors?view=all
Voltage meter : https://docs.google.com/document/d/1BRzYAUYtOiMDyJuZRXspMl3MFOJvFIbTNWXEvcXMsLQ/edit#heading=h.psmccwuvnuvx
Resistance Pencil:
https://make.techwillsaveus.com/microbit/activities/micro-graphite-303