It really depends on how the wall-wart is designed if its one of the newer switched-mode supply wall-warts, then no, it won't work. If input is 120V AC and output is 6V DC, would 60V AC yield 3V DC? if that's the case, 24V AC would yield a little over 1V DC. My question about the wall warts was whether the output was just a function of the input or if it was only a specific voltage. I have a separate power source, sorry for the confusion.Īs stated before, you can't do this directly. I'm trying to send 24V AC to an Arduino digital in. With one of the industry’s broadest technology portfolios, ST's products are found in today's most innovative electronics solutions. STMicroelectronics Products and Applications - STMicroelectronics Here is some info on power supply design that google turned up. Normally, you'd also have a second capacitor after the regulator to further smooth out the ripple. The voltage regulator knocks the voltage down further to the value you really want and further smooths out the imperfect output of the capacitor. The capacitor fills in the gaps, but not perfectly. The output of a rectifier is either just the positive halves of the sine wave (half-wave rectifier) or the positive half and the negative half flipped over (full-wave rectifier). The 24Vac may push the limits for input voltage on many small regulators though.Ī voltage regulator and a capacitor are not the same. You can fairly easily build a small power supply with a bridge rectifier, a few capacitors, and a small voltage regulator. No, most wall warts will not give you the voltage you need to power the Arduino with only 24VAC input.The a capacitor can hold the input high between the pulses, otherwise you'd randomly get a false "off" or would have to deal with that in software. I include a capacitor on both of the above because either option will give you a series of pulses when the AC is on. ![]() ![]() You have a few options:Ī) opto-isolator (plus a couple resistors, small diode, and a capacitor)ī) input protection/level shifting with a diode, resistors, small capacitor, maybe also a zener diode. This sounds like you're asking two questions:ĭo not put 24VAC directly to an input pin. If there's another easy solution, please let me know. I'd rather use a wall wart just because I have a bunch laying around and I don't have many free diodes. I've heard of using a voltage regulator to fix this, but would a capacitor connected to ground do the same? forgive me if this is stupid, I'm somewhat new to the AC field. I mostly just want it to make DC, I can make a voltage divider really easily to step it down from there.Ģ- I could use a rectifier, but to my understanding it doesn't make a constant voltage, it bumps up and down. I have a couple of questions:ġ- can a wall wart (ie cell phone charger) take in 24v? on all of mine it says something like 110-240. However, the heat pump uses 24v AC and I'm using wall warts for the other bits of my project. They way I plan to do this is to send a line from the heat pump up to a digital in on the arduino and have "if (digitalRead(pin) = HIGH), log to flash drive" running. In short, as I said before, they are different products with different audiences, and therefore different design goals.I'm working on a project to monitor a heat pump and log when it's on and off. Yes, you can use the Arduino IDE with a Pico now, but that wasn't that way from the beginning, and the fact that you can do so now is A) not because Raspberry Pi released any official method and B) because the Arduino IDE exists in the first place specifically to support Arduinos. And the toolchain is _far_ more complex for beginners! Hell, I had some issues setting up the Pico toolchain on my Mac (and I'm not a beginner), whereas with the Arduino, it was just "get the Arduino IDE". ![]() ![]() You need a breadboard in order to use it with anything else. In contrast, Pico is far more complicated for beginners, since it's not designed for that purpose. I believe a secondary design goal is to still be useful past the beginner stage (which is where comparison with a Pico comes in), but that's not the _primary_ goal. And why Arduino shields exist, so you can add on the Unos in plug-and-play kind of fashion, for beginners. This is also why the Arduino Uno can be used without breadboard. This is why the Arduino IDE exists (and why many more advanced hobbyists eschew it). Arudino Uno has _always_ been primarily about being super simple for beginners.
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