STEM

This uses just two cheap small electronic devices: an LDR and a 10 kΩ resistor. So already we have some jargon to decode! Devices like switches and buttons have just a few possible different states – maybe just on or off. These can be represented by numbers like 0 and 1. They are called `digital inputs’. Devices like knobs and temperature sensors can change continuously, varying the ... ................
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