Reddit reviews XYGStudy Raspberry Pi Expansion Board Power Relay Module for Raspberry Pi 4 3 2 Model B B+ A+
We found 2 Reddit comments about XYGStudy Raspberry Pi Expansion Board Power Relay Module for Raspberry Pi 4 3 2 Model B B+ A+. Here are the top ones, ranked by their Reddit score.
Raspberry Pi Expansion Board, Power RelayThe RPi Relay Board gives your Pi the ability to control high voltage/high current devices, easily makes normal home appliances become intelligent.Standard Raspberry Pi 40PIN GPIO extension header, Supports Raspberry Pi A+/B+/2B/3B/3B+/4B and later versionsHigh quality relays, loads up to 5A 250V AC or 5A 30V DCPhoto coupling isolation, prevent interference from high voltage circuit
Jesus. You need to attach this device to you keyboard. It enables you to start the pixie chain.
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This is something I've been working on. I have over 50 houseplants and it's important to be able to accurately monitor our grow space.
Hardware wise I'm using a DHT22 and this 120v relay module.
The way my script works is a little weird to get around some of the intricacies of the DHT22. It'll only give a reading every 2 seconds but I found a lot of odd readings. Sometimes you'll get a 3,000+ temperature or humidity value.
So if you're monitoring temp, humidity and soil moisture how do you plan on adjusting those?
Moisture in the soil is simple to water with the relay and a small pump. When searching for a pump, make sure to check that it'll pump high enough from your reservoir to your plant. Some can't push water much more than a few feet high.
Temperature and humidity (RH) are inversely related. The higher the humidity, the lower the temperature. When you introduce more moisture into the air, the temperature will drop. This leaves you being able to adjust your temp and humidity kind of simultaneously, or at least try to maintain a good range. I essentially built a swamp cooler / evaporative cooler as my humidifier.
I don't control my lights as they've been on an analogue timer since I've started growing. Unless you plan on varying the lighting schedule to experimental schedules (something other than 12-12 or 18-6) I would suggest throwing your lights on a cheap timer. You can get a 2 grounded outlet timer for less than 15 bucks.
With 3 relays, my plan is control my water pump in my humidifier, a pump to water plants and control of the main fan that pushes through my humidifier into the grow space. The relay seems to require a 5 second delay between on and off sequences though so throttling the water pump will be necessary.