All items tagged with alarm and sensors (5)

20-07-2026 | Before smart cameras, wireless sensors, and connected security systems became commonplace, protecting a room could be as simple as a laser b...

10-04-2023 | Have you seen the movie "Mission Impossible” with Tom Cruise? Would you like to know how to catch him with a $40 sensor? Try building a high...

1-01-2016 | Just add a few external components to a standard low-cost smoke alarm and turn it into a universal alarm sounder. You can easily hook up the...

1-10-2002 | This alarm system uses two PIC16F84 processors and is relatively easy to build and install. The cost is very low compared to ready-made syst...

1-07-1991 | In this somewhat unusual digital voltmeter, the measurand (voltage to be measured) is digitized in an analogue-todigital (A-O) converter...