Review on DAOKI 5PCS Human Motion Sensor HC-SR505 Mini Infrared PIR Detector Module For Arduino Body Sensor Switch With Dupont Cable Female To Female by Ben Boulanger
Half don't work, the rest varies between 8 and 11 seconds Minimum on time
They are inexpensive. Unfortunately it's too cheap. During the "on" time, they stay on for a few seconds even if no more events are detected. This is normal and quite normal for PIR sensors. With the HC-SR505, this "on" time cannot be set. When I ordered, the time fluctuated: two devices had a minimum switch-on time of around eight seconds. The third device had a minimum switch-on time of about eleven seconds. The fourth device never signaled a change. ever (dead). The fifth block signals the change and then never turns off (dead). Failure rate 40%. this is a REALLY terrible quality. remember that you have to test each device yourself. and expect a VERY long turn on time. I won't buy them again.
- Annual trial period
- Expensive
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