| The LM1830 fluid detector IC from National Semiconductor is designed to be able to detect the presence of fluids using a probe. This chip re...
More about Alarm (115)
| Here are two circuits that make it possible to add up to eight detectors to an existing alarm system without running a single cable. Each tr...
| Once again our workshop project is a true blue recycling project—turning an old telephone router and a wireless front door bell into a wiref...
| The car alarm described here detects changes in the tilt angle of the vehicle in which the alarm is installed. It is set off when the change...
| Motorbikes are often a target for thieves. Here is an alarm that's loud, cheap and simple to build. Arming and disarming the alarm is do...
| Water is vital for humans, but too much of it has an undesirable effect, particularly when it turns up in the wrong places. This is what two...
| Although this alarm is designed to protect valuables left in a tent, it can also be used as a baggage alarm (either on or in one‘s bags) and...
| If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace...
| The first two articles in this series show how the microcontroller is capable of ‘playing all alone’ – the only interaction with the outside...
| This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and proper...