On one end, I will draw power from the wall socket (the mains), on the relay end I will have two terminals (hot and neutral), on the solenoid valve end I will have three terminals (hot, neutral and earth), these terminals'connections on the valve are screw nuts type like you described.Ĭonnecting Arduino with the relay is very easy (positive to positive, negative to negative), but I don't know how to wire the mains with the solenoid valve. In general, it's not safe to work on power line voltage, so you may just have to be careful when testing/troubleshooting/experimenting!įirst thank you very much for help, my knowledge on the electrics are very limited. But it's hared to work with one hand in your pocket, so electricians working on 120V/220V household power don't do that. If you touch the grounded box with one hand and a hot power line with the other hand, there is a "nice" path for the current to flow from hot, through your body, to ground! The guys who work on really high-voltage stuff have a "rule" to keep one hand in their pocket (and wear insulated shoes) so there is no path through their body. Ironically, a grounded box creates a hazard if you have the box open to work on the connections. But, if the ground comes loose, or something is wired incorrectly so that you or the Arduino somehow makes contact with the line voltage, bad things can still happen! (The relay provides isolation between the power line voltage and the low-voltage Arduino.) If all of the AC closed-up is in a grounded metal box, it's safe because if anything goes wrong the current will be "shorted" to ground and you'll blow a breaker. It's safe as long as everything is insulated, isolated, and wired correctly, so you can't touch the hot wire or anything directly connected to the hot wire. Electricians normally use Wire Nuts to attach wires in "free air", where there is no screw terminal or other option. Are you getting power from the wall socket? What kind of connections does the solenoid have? (I don't know the UK color code.)Īnd tie those pins to the relay accordingly by electric tapes ? Is this safe ? That depends on what you have on either end. (Usually, there is also a ground terminal on the switch for safety, and "3-Way" switches have 3 power-terminals.) Have you ever looked at a regular light-switch in your wall? There are only two terminals and only the hot passes-through the switch. The neutral & ground are directly-permanently connected. The hot wire passes-through the relay and gets switched. You apply 5V and it turns on, remove 5V (or switch the arduino output to "low") and it turns off. Again we don't kwow what's inside, but if it's rated to be controlled by 5V, you don't need a current limiting resistor or anything else. And, if you check the control current it's probably less than 10mA. Generally, these things have a range like 3 - 15VDC, so the voltage should be fine. ![]() We don't know exactly what's in side the relay, but it's ready-to-go. shown below in the picture) and cut the head or open the head and tie those pins to the relay accordingly by electric tapes ? Is this safe ? Can you teach me in some details like which line goes to which ? For example, how does it differ from the typical bulb connection below. How do I physically connect the relay, valve to the mains ? Do I buy a cheap UK lead (e.g. ![]() ![]() So do I need another different relay that has the earth pin on it (any recommendation or that is the name that has earth pin on it) ? Or there is a way of getting around this ?Ĥ). However there are only two connection pins on the relay: hot and neutral. There are three power pins from the valve and the mains as well: hot, neutral, earth. If I do not need another snubber circuit, do I just connect the Arduino - relay - solenoid valve - mains directly without additional resistors ?ģ). Please see the picture of the SSR40-DA relay below, do I need another snubber protection circuit, or usually solid state relays already incorporate in this itself ?Ģ). Can you help me with the connection please as I only know the DC connection.ġ). Basically I want to control a 230V AC solenoid valve by Arduino via a relay. I am doing a project which now requires 230V AC circuit connection.
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