/Schematics/Security devices
| Title | Short description | Rate | Download |
|---|---|---|---|
| Touch activated alarm v2 | Activates alarm when someone comes close to the device. | 2.96 | 3,347 |
| Touch activated alarm v3 | Activates an alarm by touch of a hand. | 2.88 | 4,679 |
| Ultrasonic sensor v1 | Ultrasonic (piezzo) sensor/detector with NE555 and MAX406. | 2.90 | 2,493 |
| Ultrasonic sensor v2 | Detects motion based on ultrasonic sound. | 2.92 | 2,632 |
| Ultrasonic sensor v3 | Detects motion with ultrasound. | 2.90 | 2,240 |
| Wind sensor | Can be used for high-security alarms as a motion sensor. | 2.91 | 2,329 |
| Wireless car alarm | A very simple wireless car alarm device. | 2.92 | 10,717 |
