this program works when I disconnect the relay before uploading the code and then reconnect them. if i then unplug my arduino uno and then plug it back in it doesn't work, the relays turn on and off all the time. not until I disconnect the relays and then reconnect them does it work. What is wrong? …

Connect LEDs (with series resistors) instead of the relays. Does the code work as expected then? If it does, the problem is with your circuit, so please post a schematic.

While you are testing with the LEDs, I will work on improving your code. We don't know yet if the code has a problem, but your code can certainly be improved. const byte channels = 3; const byte relayPin[channels] = {3, 5, 7}; // Pins controlling the relays const byte moisturePin[channels] = {A0, A…

it works with led but not with water pump. the relay switches on and off all the time. I have drawn a schematic but there was not the 4 ch relay that I use nor the soil moisture sensor that I have but I hope it still works. [Sizzling Allis-Turing] [Skärmbild 2024-04-07 155243] the second picture…

3 pumps and 3 relay coils are too much load on USB supply, you need a separate 5 volt supply of at least 2 Amps. Also, you should have a kickback suppression diode in parallel with each pump, cathode (end with band) toward + (positive) voltage.

[image] ulferts: pinMode(MOISTURE_PIN, INPUT); pinMode(MOISTURE_PIN1, INPUT); pinMode(MOISTURE_PIN2, INPUT); pinMode(MOISTURE_PINtorr, INPUT); Don't do the pinMode on pins to be read as analog inputs. That's for setting up digital inputs. Using those capacitive sensors. I found they…

Capacitive soil moisture sensor, 4 relay

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ulferts April 7, 2024, 6:15pm 6

ok thanks i will try it

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Capacitive soil moisture sensor, 4 relay

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