Description: directly by ICs Extremely thin and light Low Frequency and multi frequency capability Speaker and microphone capability No EMI /RFI Piezoelectric Buzzer & Ringer Applications Include: ...

Power supply unit 110-240V input, 12V output to power whole system,can reduce the load of access controller, save wiring to reduce the hidden trouble.

There are several other quiz buzzer projects kicking around Hackaday if you’re interested. One of our favorites is this system which uses plastic bowls as the buttons.

Description: ID number as feedback to your transmitter. This is both safe and useful if you want to control several applications with the same transmitter, for example several cranes. All Tiger G2 ...

This allows him to send text messages to himself when the alarm system is armed, disarmed, or triggered. All the code is available on GitHub in case you also have a DSC 1550 alarm system.

If your apartment has an existing wired doorbell, check out the voltage and then look for compatible smart doorbells. This ...

Volvo’s Martin Magnusson says that when there are too many beeps, alarms, buzzers, flashing lights and dashboard messages ...

The HI20 series allows inspectors to check efficiently and find the source of system failures faster than with a IR temperature gun ... Rainbow, and Ironbow. It triggers buzzer alarms when a ...

Patients with broken bones and those recovering from surgery have been relying on counter bells to get the attention of nurses at Sydney's Nepean Hospital due to a faulty alert system. An ...

IT'S all kicking off at the Britain's Got Talent auditions after the golden buzzer was hit three times and new judge KSI casually glided in via a private jet. New BGT judge KSI, who is standing in ...