Anyone know of a breakout board for a SPM0404UD5 or any other similar ultrasonic MEMS sensor? I want to build a ultrasonic detector so I'm looking for something that can detect the presents of ultrasonic sound (if you could call it that ).
Thanks
Success! In all my testing and trying new settings, I missed that I had commented out on the gateway the frequency setting. It was noobie mistake and I want to thank all of you for your help. I ended up using @FarmerEd's sketches to get my gateway and sensor to work.
Thanks again.
Is your relay coil connected directly to Arduino pin?
It draws too much current, this needs to be powered through transistor or use ready made module:
https://thesolaruniverse.files.wordpress.com/2020/10/079_relay_fig_01_96_dpi.png
@Bogusz-Jagoda well, if you buy modules for 50c including shipping, you can be sure they are counterfeit. If you buy slightly more expensive Ebyte modules, they always work. You get what you pay for.
Hello everyone!
Based on the quite useful reverse engineered schematic at https://hackaday.io/project/174308-tradfri-pir-motion-sensor-hacking the measurements were somewhat sabotaged by the 2N7002 (see Connors comment "enables voltage dividers only when triggered").
the transistor is controlled by the Elmos E931.96 PIR motion controller IC.
The latter is programmable by the IKEA TRÃ…DFRI ICC-1 module's EFR32MG1P132F256GM32 MCU.
E.g.
2. Blind Time
Ignores motion after the interrupt output is switched back to 0
Range: 0.5s... 8s.
The blind time is [Register Value] *0.5s
3. Programmable pulse counter
1... 4 pulses with sign change in between
Amount of pulses = [Register Value] + 1
4. Window time
For noisy environments
2s... 8s window
Window time = [Register Value] * 2s + 2s
https://github.com/basilfx/TRADFRI-Hacking gives a good overview on that.
What is the issue with tose 60s?
I'm not really familiar with FHEM, but as far as the MySensors side, you still need the gateway software running. However, this code can run directly on a Raspberry Pi, at least with a radio network for the MySensors transport. I haven't ever used RS485 myself, but I would think it would be similar.
At least the code itself has sections for dealing with running on Linux, which is what is used when running it on the RPi, so I think you're good. https://github.com/mysensors/MySensors/blob/master/hal/transport/RS485/MyTransportRS485.cpp
The gateway code runs as a systemctl service, so it can easily run in parallel with most things, so probably wouldn't conflict with FHEM on the same device.
Oh yeah, and in case you haven't found it, there's this page: https://www.mysensors.org/build/rs485
To provide a large enough pulse to drive the ceramic transducer , you need a lot of energy, so they pump up the 5v with an inductor/transformer to provide a high voltage pulse. This is 60v or more…
The more Energy you produce the farther the pulse will travel….
Everything thing else on the board run at 3.3 to 5V.
Add a large Capacitor of 100 µF are so between the 5v and ground on the device, this may clean up your problem.. Some CPU modules just can’t supply enough current quick enough that’s needed when the pulse is triggered.
These are very inexpensive device, we’re luck to see them work at 1/2 the spec range.
).
