Hi, I am looking at building two of the same system that will enable control of an industrial evaporative air conditioning system. These will be setup to run continuously for 4-6 months with as little intervention as possible.
The system will need to be mounted inside a plastic enclosure, preferably on DIN rail, outdoors (trying to avoid direct sunlight).
It will be powered by a 12v battery system so will need a buck converter.
An external antenna (ESP32) is preferred, but not essential.
The following parts are required (for a single system):
5x DHT22 sensors
1x DS18B20
1x ESP32
1x Relay
1x microSD reader/writer
1x float switch (small)
1x 128x128 OLED (or similar)
If possible, something like the Gravity or the Grove from DFRobot or Seeed would be ideal as they seem quite modular and more easily managed in an enclosure. Also, a way to mount the ESP32 (and other items) on DIN rail would be great. There will also be terminal blocks in the enclosure with compression glands etc.
Hi David
Din Rail. Now you are talking. Extremely useful stuff. Comes in both slotted (pre drilled with slotted holes) or plain.
I think that just about any bit of gear made can be mounted with a vast array of brackets etc available. Even dedicated things like relays, terminal blocks etc specially made for this type of fitting.
I often wonder at things advertised as being “Din Rail” mounted. What sort of rail are they talking about. Things from China etc seem to make no attempt to clarify.
So don’t just go out and buy “Din Rail” bits.There are a number of profiles and sizes. The most common would be 35 X 7 symmetrical, plain or slotted. I think that is the sizing, Purely from memory.
Where to get it?? I would look at Element 14. The last time I used any of this (about 25 years ago) they used to carry a vast array of rail and bracket bits to fit. I have not had a chance to look myself yet but will do so later.
Cheers Bob
Hi again David
Just had a quick look. RS have a vast selection.
Search “Din Rail” 28882 items.
Search "Din Rail mounting accessories 2896 items.
Of course not all items are in stock and you can apply further filters to reduce this.
There again you might find what you want on the first couple of pages.
Ensure the plastic enclosure is IP-rated for outdoor use and has provisions for cable glands and terminal blocks. If opting for external Wi-Fi connectivity, consider an ESP32 module with an external antenna or use an antenna extension cable.
There’s a wide range of buck converters here: Step down converters. The required current depends on your load, but anything in the 2A–5A range should work safely.
For your sensors, I’d recommend shielded wire if they’re mounted far from the ESP32 (roughly >20 m) to help prevent interference.
