Writing only Arduino code, it is easy to set up control over experiments and display results on your PC's panel application.
Control a solenoid/relay or whatever your locking system, and change the passcode by the keypad only, no program reupload.
Project tutorial by SurtrTech
Need a quick way to monitor the soil moisture level of your favorite fern? Look no further. We have the answer.
Project tutorial by Mark Phillips and Peter Main
I found this on amazon - its cheaper from chineese suppliers - make sure you get the board also
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