Hello everyone, just like the title said, i want to modify my wash machine, Instead of the 2 time that my machine's water pump activates and throws the water away, I would treat this signal in my arduino program, it would cause this "second activation" by my arduino to activate another pump in order to reuse the water, looking for with a multimeter on the board of my washing machine, I found out that the "signal" that the board sends to the pump is 110v, it's been more than 2 years since I've seen an arduino, but I'm sure the input pins of the arduino do not support this voltage, because instead of this signal coming from my washing machine board going straight to the pump, I would send this signal to the arduino so I can do my logic, but there is this 110v problem, so some help? should i use a transformer or something like that?
This is a perfect place to use a 110 volt relay. Your relay needs a single set of contacts, so they are closed when the motor is energized. One relay contact goes to the Arduino ground and the other contact goes to an Arduino pin that is set to input pullup.
When the motor is energized, the Arduino pin will go LOW and your code can test for that change and do what ever you want.
Of course, you also need to code for when the motor is turned off.
Paul
Hello paul ,thanks for helping me, which specific relay are you talking about? do you have a link to share? i dont know, maybe maybe I have put double interpretation on my problem, but what I want to do is take the SIGN from the washing machine board when the PUMP is activated (the 110v signal) and send it to an INPUT on my arduino, so that then I can trigger this pump through my arduino once, and the next time I receive a second signal, instead of triggering this pump again, I would trigger another pump, so that instead of throwing it away, the water can be taken advantage of. The problem is that, the signal from the whasing machine board "send" 110v, the arduino in "weak" he can't heandle this much...
Thanks for helping me
Honestly, I think you should stay away from 110 volts if you can't search for a 110V relay.
Thanks for the tip, NASA engineer
The logic board of the washing machine will not be running at 110v. The wire going to the pump will be switched on/off by some other part of the logic circuit (probably via a transistor or relay)... you should look further at the circuit to find the logic component, and use that rather than the power circuit that is powering the pump. Do you have the model of the washing machine? or a view of the circuit diagram?
Who is still alive. 
OK, so if you know how to work with mains, then you want one of these:
Note it works just fine with 110 V.
NASA Engineer....Yeah right......
Rather a daunting task these days given the nature of mass produced pcb's.
I foresee a large puff of smoke on the horizon.
Why don't you simply do what they used to do back in the 70's.
Swap the hose into another tub when the rinse cycle starts.
This could easily be done without "tapping into the original circuit" AND using low voltage Arduino counter and low voltage control valve on the outlet hose.
For one thing, electrocution avoided.
What gave him away?
Paul's is the perfect solution. It's the least invasive to the machine and simple to implement in the Arduino.
Any simple relay with a 110V coil will work, just search for one in a form you can fit into the machine.
he is must be fun in parties? maybe...
see thats i am talk About, i was imagine another relay, like that have in my country, this that you show is a little diffent that i have i my country
Your washing machine has a schematic of the whole machine pasted somewhere inside the case of the machine. Find that and you will be able to see if there is a "sign" for what you want to do.
Paul
Thanks for the tips, I want to avoid an accident, but on the other hand I want to save water, even make it an idea and maybe sell it, I don't know. my system to use the water, or I put the arduino in the end only interfering with this pump in specific, now you gave me another possible solution.
can use one of these ?
this is 110v/220v?
Again thanks for helping me
Thanks bro, i will look deeply
yep, i was thinking that, in this photo ,i have one example of board that i got, I imagine it can be called "power board", those wires on the right, one of them goes to a pump that will control, and the voltage that comes out of these wires is 110 v, I was also thinking that it is not possible for the drive command I need all this, I'll look deeper, thanks
No. Unless I and Paul are completely missing your description. That relay module is for controlling a 110V device, but you want the Arduino to know when the 110V motor is turned on.
You want something with a 110V COIL. Like this:
You mount this inside the washing machine and wire the relay coil across the motor wires so that the relay coil is energized with the motor. But if all you are doing is to turn on another pump, then I fail to see why you even need the Arduino.
ahhh yes, thats make thing clear, I did not know that this type of relay existed (for this type of application) so my inquiry about the type of relay