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Long Range Network (~1 mile)
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Long Range Network (~1 mile)

by brentschmidt on Wed Mar 06, 2019 4:26 pm

Looking for a long range network to turn on and off irrigation wells on a farm. Each location would need to simply control 1-2 relays. Would like to also measure pressure, voltage, a-c current, and maybe flow rate at each location.

Would a Feather M0 with RFM95 LoRa Radio - 900MHz - RadioFruit, or a raspberry pi zero with a Adafruit LoRa Radio Bonnet be good platforms? I think I would prefer the raspberry pi all things equal.

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Re: Long Range Network (~1 mile)

by millercommamatt on Wed Mar 06, 2019 7:12 pm

1 mile is within the range of what LoRa can do but you'll likely need good antennas and line-of-site.

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Re: Long Range Network (~1 mile)

by brentschmidt on Wed Mar 06, 2019 10:55 pm

Will the Raspberry Pi or the Feather be good platforms for this?

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Re: Long Range Network (~1 mile)

by brentschmidt on Wed Mar 06, 2019 11:12 pm

Is Lora Necessary for this Range? Pros/Cons vs WIFI? Power is not an issue..

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Re: Long Range Network (~1 mile)

by franklin97355 on Wed Mar 06, 2019 11:14 pm

Either will work fine. Your choice will be in whether you want a "controller" or a "computer"

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Re: Long Range Network (~1 mile)

by millercommamatt on Thu Mar 07, 2019 11:31 am

You would need a more expensive antenna to get 1 mile range for WiFi. If you do some searching, you'll see direction antenna kits for WiFi routers. It looks like you can get the antenna for well below $100 each. You could set up a WiFi bridge using those. You'll still need line-of-sight and you'll probably have to spend a few hundred dollars to get everything working. Ubiquiti sells some turn-key WiFi bridge systems that are competitively priced.

There are several ways to so this. It's just a matter of you budgets for time, money, and complexity.

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Re: Long Range Network (~1 mile)

by brentschmidt on Thu Mar 07, 2019 9:19 pm

What is the difference between these two boards?

Adafruit Feather M0 with RFM95 LoRa Radio - 900MHz - RadioFruit

Adafruit Feather M0 RFM69HCW Packet Radio - 868 or 915 MHz - RadioFruit

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Re: Long Range Network (~1 mile)

by franklin97355 on Thu Mar 07, 2019 9:30 pm

The radio chip onboard. You can see the differences in this tutorial.

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Re: Long Range Network (~1 mile)

by brentschmidt on Mon Mar 18, 2019 5:42 pm

About to pull the trigger on this. I have the following items in my shopping cart.

https://www.adafruit.com/product/3178 Adafruit Feather M0 with RFM95 LoRa Radio - 900MHz - RadioFruit
https://www.adafruit.com/product/3191 Adafruit Power Relay FeatherWing
https://www.adafruit.com/product/2900 Adafruit FeatherWing OLED - 128x32 OLED Add-on For Feather
https://www.adafruit.com/product/3340 900Mhz Antenna Kit - For LoPy, LoRa, etc

Also adafruit is out of stock on uFL SMT Antenna Connectors, so I found the following one at Mouser. Is this the best connector to use here?
https://www.mouser.com/ProductDetail/Taoglas/RECE-20279-001E-01?qs=WUa1z%2FNV9%252B3mVij1vDlP0A%3D%3D&gclid=Cj0KCQjwg73kBRDVARIsAF-kEH_SNmB3bWnt8yJPSM45FN8D6HRRZ6_Ny_40HLJKo6UjZBf4Uwto1SwaAiTREALw_wcB

Looking for appropriate enclosures. If I mount inside the the existing pump control panels (https://motorsandcontrol.com/brands/siemens-furnas/motor-starters-contactors/siemens-pump-panels/) I was thinking of using the Small Plastic Project Enclosure - Weatherproof with Clear Top. This will be extreme hot and cold environments (10-110 *F ambient temperature depending on season. Definitely hotter in the pump control panel). Is temperature a concern here? Also would need to run the LoRa cable through the enclosure and the pump control panel (any suggestions for mounting an antenna to the pump control panel?).
https://www.adafruit.com/product/903?gclid=Cj0KCQjwg73kBRDVARIsAF-kEH8iji5Be5-aEf9Ms1cpe3Ime-1u5NqZ0Rf8m9G9cvFJxI06u9b_IGgaAqXSEALw_wcB

If I mount it outside the existing pump control panel I was thinking of using a WH-06 WH Series Hinged NEMA Enclosure from Polycase.
https://www.polycase.com/wh-06.

All of the existing panels are 480V, so I am planning to use a transformer to convert to 110V to power the Feather. The relay FeatherWing is only rated up to 240V, so I also need another contact to complete the 480V circuit to complete the pump control circuit. Is there a simpler method here?

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Re: Long Range Network (~1 mile)

by brentschmidt on Sat Mar 30, 2019 10:34 pm

Thinking of running the 3.3V on the M0 Feather through this relay and back to on of the GPIO pins of the M0 Feather. Is this a legitimate method for getting a hi/low signal to the Feather? Do I need to fuse this signal? Do I need to buffer the signal?

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Re: Long Range Network (~1 mile)

by franklin97355 on Sun Mar 31, 2019 12:08 am

That is a 120 VAC relay coil and would not work. Most relays will not work directly from the Feather because the current needed is more than the Feather can supply.

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Re: Long Range Network (~1 mile)

by brentschmidt on Sun Mar 31, 2019 10:51 pm

I'm not looking to energize the relay with the feather. I'm trying to figure a creative way to get a 3v signal to the feather......

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Re: Long Range Network (~1 mile)

by franklin97355 on Sun Mar 31, 2019 11:12 pm

If you are looking to get the relay output to the Feather it would be better to run between the GPIO pin and ground with a pull-up resistor. You would not need any resistor in the relay line.

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Re: Long Range Network (~1 mile)

by brentschmidt on Sun Jul 21, 2019 5:59 pm

franklin97355 wrote:If you are looking to get the relay output to the Feather it would be better to run between the GPIO pin and ground with a pull-up resistor. You would not need any resistor in the relay line.


I've had to set this project aside for a while and I'm just getting back to it.

If I understand you correctly I would Create a circuit from the 3V supply on the feather, through a resistor, through the normally closed relay to the ground. The GPIO pin would be connected between the resistor and relay. Is this correct?

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Please be positive and constructive with your questions and comments.