Cellwatch is the premier battery monitoring system for highly critical technology installations where loss of power continuity is not an option. With the correct use ...
Another casualty of the smart phone revolution is the humble bedside alarm clock as its radio ... it by using the existing buttons through a relay wired in parallel. Using the existing circuitry ...
have it toggle a relay hooked up to a loud siren. Even if you aren’t looking to make your own makeshift alarm system, the code and video after the break are a great example to follow if you want ...
Description: The DP-F31 ratemeter/totalizer accepts 3 to 30 Vdc pulses, dry-contact closure, voltage, or milliamp inputs, and provides 2-stage SPDT relay outputs for batch control. The display is ...
Tired of being jolted awake by your phone’s alarm? If you’re looking to break the habit of reaching for your phone first thing in the morning, switching to a physical alarm clock might be the ...