RPi3 vs. 32 relays

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pvoj
Posts: 12
Joined: Saturday 03 October 2015 22:32
Target OS: Raspberry Pi
Domoticz version: 3.5964
Location: Hungary
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RPi3 vs. 32 relays

Post by pvoj » Friday 22 June 2018 13:45

Hi All,
I have read the relevant topics (I hope so), but I could not find the solution.
I need to control 32 relays from Domoticz. Since it will be an essential part of a heating system, it needs to operate reliably for years. So I would connect 2 of 16 relay modules to the Raspberry Pi 3. The question is how?
I have some SN74HC595N shift registers in the drawer. Can I use them to multiply the output ports? But how can I control them from Domoticz?
Or should I use am Arduino Meg2560 and communicate with it through serial?
Has anyone some experience with a problem like this?
Thanks! :-)

snellejellep
Posts: 124
Joined: Tuesday 16 May 2017 13:05
Target OS: Raspberry Pi
Domoticz version: 4.1xxxx
Location: The Neterlands
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Re: RPi3 vs. 32 relays

Post by snellejellep » Friday 22 June 2018 14:32

i would use the sonoff 4 channel devices with tasmota or node mcu boards with espeasy to do this, they connect to wifi, i have been using them for a year without any problems
raspberry pi | xiaomi gateway/vacuum | yeelight | philips hue | zwave | ubiquiti unifi | harmony | sonoff | https://www.youtube.com/channel/UC2Zidl ... m1OLuNldfQ

pvoj
Posts: 12
Joined: Saturday 03 October 2015 22:32
Target OS: Raspberry Pi
Domoticz version: 3.5964
Location: Hungary
Contact:

Re: RPi3 vs. 32 relays

Post by pvoj » Friday 22 June 2018 15:43

I also have some sonoffs, but in this case it would be much too expensive for 32 relays. :-(
Do you mean using node mcu with shift registers? I would be more happy if I would not need a wifi router between domoticz and the relays.

Jan Jansen
Posts: 166
Joined: Wednesday 30 April 2014 20:27
Target OS: Raspberry Pi
Domoticz version: Beta
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Re: RPi3 vs. 32 relays

Post by Jan Jansen » Friday 22 June 2018 16:50

Maybe the piface offers a solution. You can link a maximum of 4 (= 32 outputs) to the rpi. I have been using 2 pifaces for years with great pleasure.

pvoj
Posts: 12
Joined: Saturday 03 October 2015 22:32
Target OS: Raspberry Pi
Domoticz version: 3.5964
Location: Hungary
Contact:

Re: RPi3 vs. 32 relays

Post by pvoj » Friday 22 June 2018 17:19

I have found an ethernet module as a possible solution: https://www.ebay.com/itm/253147442957
It can control the modules like these: https://www.ebay.com/itm/192530066391
It can be easily integrated with domoticz virtual switch.

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