The Pico TH-03 is a cool bit o' kit in my book, it allows the measurement of temperature, light, if doors are open etc with the appropriate plug in sensor. Each TH-03 has 3 ports or channels that sensors can plug into and although the sensors themselves come with a 5m lead, each sensor can be up to 100m away (you can buy extension leads) from the TH-03 unit. Couple this with something like the RocketPort serial hub units (review coming) and the distance is almost unlimited...
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