BL412 seems a good one as very simple. The circuitry around HR-501 is simple enough but quite a few components as I want to embed the circuit into my PCB, however it does have more options to adjust sensitivity etc. I was also checking Panasonic EKMC1601111 which is used on the Scope Clock Due that I purchased Grahame (Sgitheach, I believe he's in this group too). It doesn't require any ancillary components (other than a bypass capacitor and a resistor), but it's quite expensive about about $10 or more.
I also find interesting the microwave sensor (plenty of options, I was checking HW-MS03), although it require very careful PCB decign (what a piece of engineering that is!) and I suppose it means that the enclosure of the electronics cannot be made of aluminium or stainless steel. This has the advantage of being more sensitive although microwaves travel across wall so perhaps too sensitive for a clock. Struggling to find the balance between simple design without it being overkill and something that does the job well. So many options. Il giorno lunedì 18 aprile 2022 alle 15:14:29 UTC+1 gregebert ha scritto: > I just bought a pack-of-5 from a seller on Ebay for 10 USD. They run off > +5 VDC, and the output signal is TTL-compatible (0 to 3.3 VDC), so it will > work with devices operating at 3.3V or 5V. There are many sellers of this > particular module, and plenty of info is available online. > > https://www.ebay.com/itm/192043733875 > > > On Monday, April 18, 2022 at 6:33:21 AM UTC-7 newxito wrote: > >> I use the BL412 mini PIR >> >> [image: Picture1.png] >> >> I use the mini version because I made a 3 in 1 module that includes PIR, >> GPS and temperature sensor. >> Since this thing is connected with an ugly cable to the clock, I'm >> currently working on a wireless version that eliminates the cable and >> handles all the clocks in the same room. >> Maybe later I will add more sensors like humidity or CO2... >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e54ce788-6943-4a08-97d6-caec41d50fb0n%40googlegroups.com.
