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Hi. I need to this raspberry pi. So its pins are 0 - 3.3v. Which resistor value do i need. I ask if i need to change 47 ohm. Then i ll connect pins where the led is and then read value. Right? Thanx
Hi. I need to use this with raspberry pi. Raspi pins operate in 0 - 3.3v. so which resistor value do i need. I ask if i have to change 47 ohm R. Then i willl connect raspi pins to where the led is and then read value with wiringpi functions. Right? Thanx
Simple Water Sensor
I'm filling 5 gallon bottles with a slow 50GPD reverse osmosis system in a kitchen that is 100 degrees most of the time. I want to have it notify me when the bottle is almost full as I have forgotten and flooded the damn kitchen 3 times now.
so is the button to be activated when a liquid product gets low if so this sensor circuit won't work. what is the dash button doing ordering a product or some modified use i will create a circuit to fit your needs to work with the button
Great project ! I was seeking something like this since a while, but just found the good search terms now ^^. I have a question, does this : Wouldn't be cheapest ?
A pull up resistance would made the job. It's very simple : electricity is lazy, really lazy, so it will always take the shorter, easier path. A resistor is a kind of hill, so it is harder to take, than a wire, which is a flat, right lane. A pull up resistance, makes the path to the Vcc, harder to reach, than GND. So it keeps your input to GND. But if you cut the wire, the electricity will pass by the resistance, and give a HIGH state to your input on your dash button.Now, if you need it to be a short impulse, not a continue one, you must look about the 555, the most famous timer of all time. It will create the impulse, once, even if it still high at its input.
it's just on a tiny circuit board. It's the button on the Amazon Dash Button. I wanted to make this as cheap as possible and these sell for only 5 bucks.
To better help you what does the button do. What does it turn on or off. Is it in series(a switch wired in line with the + or -) with a pump is it a button of a control board(circuit board). Depending on this it could be as simple as an other transistor or a Mosfet transistor (can handle more power) or a relay switch (a lot more power)?
How would I modify this to "press" a button instead of the led? I am considering coupling this with a dash button for an ultra cheap smart sensor! So how would I make this activate the button?
If you're doing this for drinking water DON'T USE STAINLESS STEEL !!!I was going down that path too, thinking that there will be little/no corrosion, but then I noticed a strange substance in the water. Turns out that using stainless steel as electrodes is a bad idea as it releases a poisonous substance! ...See http://antique-engines.com/stainless-steel-electrodes.htm
Can you show me the diagram in PCB ?
look for stainless steel wire used for welding and use terminal board for conexion
how do you prevent corrosion on the wires? I want to use it in the ocean and corrosion will be a problem.
Turn an old Computer into a web server!
Idea: Medium Speed USB Oscilloscope.
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