Hardware

@napo7 thanks for response. Actually I want to avoid such solution. The main reason is the reliability. Just want to have wired connection between switch and the actuator. I tried the solution with resistor ladder like this: (5V) | (R=2kOhm) | (ADC PIN) --- (SW1) --- (R=1kOhm) ----- -- (SW2) --- (R=1.5kOhm) -- --- (SW3) --- (R=3kOhm) ----- --- (GND) So pressing different switches (SW1 to SW3) should result in different resistance seen between ADC PIN and GND. And to be able to detect multiple switches pressed at the same moment the resistor values must differ. Unfortunetly this makes very little differences between some combinations, and i'm afraid that on 5 meter long wire the noise will cause misdetections. Does anybody used such solution ?

@bgunnarb nevermind... but still finding the best way how to wire it and power it. Readings are inaccurate :(

@MikeF Great, I just found the same unit right before your post. Seams to be the best option right now.

Then you have to modify it a bit. I really think you should try this yourself to learn how it works. Have you read the relevant API pages on the main site? Did you get stuck somewhere?

@TimO Great, thank You!

If I remember well there should be some modbus libraries on github

I think it's not worth spending time on a half working solution when there is a working one that's very cheap

@gohan Thanks for info.

@dbemowsk said in Problems with an SI7021 temp/humidity sensor: @Yveaux So I tried that library and it worked. Thanks for the help. Now I just need to print an enclosure for the thing. Great!

@mfalkvidd Thank you, this is worth checking! regards,

@Aron-Sjöberg Great switches, I thought these went out of production in the 60'ties :) As you are going for a battery powered solution a good starting sketch would be the motion detector. Just replace the motion sensor with the switch and you are almost done. The switch will probably need some debouncing. Add a ``sleep(100)``` to avoid retriggering. If you want to use a momentary switch you need a variable to save the last state.

Not really, I haven't used them yet. Remember that you can use the M0 as sensor node.

@tomasandersson Have a look at this thread. I think it contains the answer on your fixed ID (children) question. https://forum.mysensors.org/topic/4834/unique-id-value-ds18b20-temperature-sensors I personally used the sample programs as provided with the MySensors lib with succes the get the DS18B20 onewire working. A resistor 4k7 from +5VDC to the middle pin of the DS18B20 connected to D3 from the arduino and both outer pins of the DS18B20 connected to GND works perfect for me. BR, Boozz

A supercapacitor with a small solar cell would be interesting - does anyone have experience (3.3/5v size of capacitor, solar cell, etc)?

Wow, i did not do this to my digital weight scale. You did a great job here