how to code a 4 solenoid valve using 4 channel relay?
i am using arduino mega 2560. according to the ph value, 4 solenoid valve should open and close at different timings.
We need more than that to go on. Product spec is necessary. Proposed schematic? Timing? Operational details?
This can be trivial or REALLY complex depending on what the desired functionality is.
Welcome.
At the right time, use digitalWrite(pin, HIGH); or digitalWrite(pin, LOW); to control a relay.
How do you determine the right time?
I m very new to this automation thing. first of all, this is for a hydroponics system. i have four tanks : macro nutrient, micro nutrient, ph up and ph down solution tank. i am using ph and ec sensor to monitor the nutrient solution status. ph value should be maintained between 5.8 - 6.2 and ec value should be 1.2-1.5. whenever these ranges exceed or lowered. relay should open/close the appropriate solenoid valve to correct the ph and ec to make sure that , the current value is within the range. i need code for this.
So you spin in loop() watching the values coming in and you have some decision logic "if this then do that". We need to know how its wired to rough out code. What have you got on hand? Drive voltage and current requirements are important as well. Sketch it out & we can be more helpful.
@anon29265702 You have provided no details about how either sensor is connected or read, nor have you provided electrical details of the relays and solenoids nor said how they are connected, so it's impossible for anybody to give any real help.
However, I took a flyer at it by:
- using leds to mimic the relays, so the actual really connections are ignored and the leds are placeholders, and
- using random() to provide values as simulated sensor reads.
I have written code which may or may not help you: it's a Tinkercad simulation here. At least the logic of my code may help you see how to go about this kind of project, but of course the hardware is nothing like what you will have for real. (The logic is exactly as both johnwasser and madmark suggested, just in an actual sketch.)
It includes an LCD to show the "sensor" values and their status as high, low or ok.
For better help, you need to provide better detail.
This forum is not a free code writing service. We will help you to write the code, if you are willing to learn and make some effort.
If you want to pay someone to write the code for you, we can move your topic to a section of the forum where others can tell you how much they will charge to write your code for you. Be careful, do not pay more than a small deposit in advance, and be prepared to loose that deposit.
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.