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Since this Instructable has been getting a decent amount of traffic, I'm going to update it soon with a proper schematic, so no one else fries their boards. Thanks for enjoying it despite all the issues!
Ah, good catch. I think you are correct in general -- the datasheet gives an example of saturating the transistor with only 15mA, so with 5v you'd want a maximum of 333 ohms. To limit the current to only 40mA to protect the Arduino, use a minimum resistance of 125 ohms. So 220 is great because it's a common resistor and is between 125 - 333.
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If your aquarium pump runs on 12v, then yes. If it's the type you plug into a wall socket, then no (you'd need to use a relay or PowerSwitch Tail, which would be as expensive as the peristaltic pump). Best of luck with your project!
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UPDATE: would you please add the following line in step 5:rm /var/local/wpa-roam.confThis is required sometimes to get a new pairing code.
The link to the original pairing instructions is broken. Can you update it in Step 7 (as opposed to putting it in a comment)?
The link to the original pairing instructions in Step 7 is broken. Can you update it?
Ah, I see what you mean about the Vin pin. But with a genuine Uno, the Vin pin appears to be connected directly to the incoming power supply with nothing in between: https://www.arduino.cc/en/uploads/Main/arduino-uno...But yeah, 3 liters per day is a lot. Best of luck!
Thanks for the info, I've updated the Instructable to reflect the 1k resistor.
I see that you live up to your name. But thanks for catching my mistake! I've updated the Instructable.
Sorry you fried your board! You weren't trying to run the motor directly off the board itself, right? This design already uses a transistor. That being said, people more knowledgeable than myself are saying to use a 1k resistor in series between the board and the base pin of the transistor, so make sure you do that.