| Electronics > Beginners |
| Is it safe to power an Arduino project with a phone charger plugged to wall? |
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| ebastler:
--- Quote from: engineheat on April 03, 2019, 03:35:23 am ---As far as short circuit protection, I believe a lot of battery banks already have that built in? Also, how about I use a fuse in my design? --- End quote --- The battery packs should have short circuit protection which protects the battery pack itself (from damaging its output voltage regulator etc.). But they may be able to happily provide currents which can damage components on your circuit in case of a malfunction or misconnection. Adding a fuse to your circuit is certainly a good idea. But a fuse will not limit current as precisely and quickly as a lab power supply; you might still end up with some component mleting quicker than the fuse. In any case, the risk of accidental damage to the circuit from shorts etc. exists mainy during the "tinkering" phase, while you build, test, and modify the circuit. That's when lab power supplies are typically used. Once you have finalized you design, put everything together in a box, and deployed it for others to use, this is not really a concern. |
| radiolistener:
--- Quote from: ebastler on April 03, 2019, 04:46:43 am ---Adding a fuse to your circuit is certainly a good idea. But a fuse will not limit current ... some component mleting quicker than the fuse. In any case, the risk of accidental damage to the circuit --- End quote --- The main risk here is people DEATH (!) from electric shock, because these Chinese chargers don't have protection. They are designed to work with gadgets which is almost always are isolated with plastic case. There may be missing short circuit protection, because there is no short circuit in the gadget. And who knows what will happens when you accidentally short out it's output? Fuse will not protect you. |
| ebastler:
--- Quote from: radiolistener on April 03, 2019, 04:54:53 am ---The main risk here is people DEATH (!) from electric shock, because these Chinese chargers don't have protection. They are designed to work with gadgets which is almost always are isolated with plastic case. There may be missing short circuit protection, because there is no short circuit in the gadget. And who knows what will happens when you accidentally short out it's output? Fuse will not protect you. --- End quote --- What you say is correct, but has already been discussed in this thread. Use of a quality, brand-name charger, rather than a Chinese no-name product, is the responsible thing to do. (Or use of a batter pack without mains connection.) The "fuse" discussion was related to the secondary question of potential damage to the equipment, especially during the development and testing phase. Please do not muddy the waters by mixing up two aspects which have already been considered separately here. |
| iMo:
I've been using several older wall chargers ( ADP-5FH C with B male usb connector, 5V/1A) for years with almost all my dev boards with no problems so far. |
| Psi:
--- Quote from: engineheat on April 03, 2019, 03:35:23 am ---I'm not so concerned with protecting the Arduino. I'm more concerned with protecting loved ones from getting electrocuted. --- End quote --- Put simply.... Every year 1 or 2 people die from picking up their phone while it's plugged into the wall. They get electrocuted because the charger they're using is cheap and has a major fault. Instead of providing a nice 0 volt ground and 5 volt power it's providing something like 225V ground and 230V power ( 230 - 225 is 5 so it's still producing 5V and works to charge the phone) but the person touches it and dies from the voltage between it and ground. So if you want to be extra safe when making something yourself, use an official powerpack from a known brand and not something cheap from china. |
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