@skywatch wait() is prefered because it will process MySensors library tasks (including checking for incoming messages) instead of blocking all the processing.
For very short tasks it's fine to use delayMicrosecond(). A "wait" version would make no sense as processing of MySensors would probably take more time than the duration you ask.

@crankycoder there are very cheap holders for those on AliExpress/eBay etc
Then you just need a 3.3V regulator (I suggest XC6206 it's perfect for that) and an undervoltage protection if your batteries are not protected.

The only problem is size, it's pretty hard to make a compact sensor with those

@neverdie it works with the code I posted.

There are a few modules available with nrf52840 now so I guess final silicon is out. But it's only available in WCSP format I think so you won't see the chip alone.

@monte thé HFCLK is on because of a hardware bug in nrf51822 when you want to wake up using pin interrupt. You have to use PORT interrupt to go really low (around 5uA).

I made some (dirty) test code to validate that with MySensors but there was not much interest in that in the forum so I switched to something else. I will not use nrf51822 but nrf52832/40, they became really cheap now and don't have this hardware bug.

You can buy on LCSC also, I bought a bunch of components there together with PCB (at jlcpcb, same company), price is not as low as AliExpress (and some US components are even more expensive than legit sellers like Arrows) but they have a lot of things at "Chinese price" that you can get all at once. I found a few things like connectors, battery protection IC etc that are hard to find or expensive on Ali/Ebay.

@tiwo85 said in Interrupts doesn't work on NRF5:

Nobody can help?

Hello, it seems everyone missed it last time you post it... Maybe the best would be to tag @NeverDie he should have a script working somewhere.

Have you tried to use interrupts the "normal" way with mysensors sleep function in the new 2.3 version ?
There's also an hardware problem with nrf51 (not on NRF52) that makes it use a lot of power (around 1mA) in sleep with the "normal" interrupt, so it needs some tricks to either use low power comparator (LPCOMP, search for it you should find a script using it from @NeverDie) or interrupt with PORT mode but that's more complex to implement. I made a script using it in the big NRF5 thread but with only one interrupt to use go for the LPCOMP version.

I have a bunch of sensors from Plantower and Honeywell, I will post some examples in September (I'm away on holidays now) using those sensors and displaying AQI on LCD.

The point I was trying to make in my previous message is you cannot really make this sensor work. With no fan and no decent factory calibration you cannot have reliable data. Look at the data sheet, the curves for min/max value are somewhere around +/-60% from real value. As air flow is generated from heating resistor results will also depend a lot on the temperature.

Hello, I think you would waste much less time buying a Plantower PMS5003 or PMS7003.
This sensor has no fan so it will never be properly calibrated even if you spend hundreds of hours tuning it.

For 12-15$ Plantower sensors will give you relatively accurate results out of the box.

Hello @franz-unix, can't you just bend the output pin of the booster at 90° and solder a wire from it to the raw pin ?

@alexsh1 air quality is more accurate than other sensors but you need to use software from Bosch. It uses temperature, humidity and pressure to adjust measures gas value with some calibration data.
As it needs a lot of memory you will need an SAMD, ESP or NRF5 processor to run it.