Hai guys, really new here and I'm not really fluent in English so sorry for bad English.
Does the pushbutton really needed a resistor because I read somewhere that you can use the "INPUT_PULLUP" code
Is it possible to make the Arduino Uno, 25V Bulb, and the 12V fan merge into just 1 plug to a power socket?
How to calculate how much current does this circuit use, I've read that I should read the datasheet but I really don't understand anything. I also read that Arduino uno have 20V max input voltage so is it safe to just use a 20V plug? or should I use according to the amount of current used.
And if you see any mistake / something to improve, I'm really thankful for correction & suggestion.
That's all from me, really appreciate any answer and thanks for the time
Hi Tom, thanks for the fast response.
Currently I don't have a multimeter but I think i'll buy it for another future project, but I have another question. If I use multimeter, does that means I have to wire all the components at the same time?
Also Hi Railroader, I read it from another discussion in this forum Power max input Voltage - #4 by SteveMann which it turns out you are there already, really sorry . There must be a misunderstanding
Refering to all questions regarding the use of Vin voltages here in forum, that's a surprice. Short time, yes. Strange if there's no note telling the BUT that comes with it.
The UNO's 5 volt linear regulator can only dissipate about 1.2 watts of power without overheating and shutting down (or burning out). If it reduces 20 volts to 5 volts (15V drop), it can only supply 1.2 watts / 15 volts = 0.08 Amps (80mA) of current. The UNO draws about 35 ~ 50mA just to run itself, so not much current left to run anything else, like an LCD display or 72mA relay coil.
. There must be a misunderstanding