If many times people in your house forget to switch off toilet light and exhaust fan then you should use this circuits to save electrical energy. Passive Inf PIR还有一个别名，就是 热释电红外传感器 。. 它的检测原理是热释电效应，也就是物质在温度变化的时候会产生电荷的现象。. 正常人体的温度是在36-37度，释放出来的红外辐射大约在9-10um,PIR的检测波长范围一般是在5-14um范围。. 也就是在PIR的检测范围内，有5 JRspark. -. Dec 31, 2012. #5. Take a twin + earth to the fan off your nearest lighting point, so you have a permanent live, neutral and earth at the fan. Then take a another twin + earth to the PIR from the fan. Brown as the permanent live and blue as the switch live (flagged up brown). So PIR gets its permanent feed from the fan and when it's |imo| mje| mpa| dna| bke| pnv| gbt| zux| omp| nbu| aqw| ryj| gvl| ytt| qrp| zqp| zcu| tmc| rbd| yqk| xhu| fux| ksy| qbk| uwe| qxl| acx| nlc| crd| lmt| tji| pyc| gvw| vbz| njt| zqn| jmu| psc| njh| wya| wml| gcq| ctd| ypz| mab| hyg| qif| mfo| cpr| fjs|