Well, there's that. Lesson learned, I guess ! I'll check again in the morning, but as klricks wrote, it doesn't look like the polyfuse is blown.
So now, until I receive my new one, I have to make up some rules for not making the same mistake again (and if a newbie like me stumbles onto this post, maybe he/she will learn from it...)
I first thought about plugging a (semi-)permanent resistor between the 3.3V pin of the T-cobbler and the + rail of my breadboard so that it would not fry out again if I accidentally linked GND to the + rail again. But when calculating its value, I realised that it would depend on the rest of the circuitry. So in the end, all I can think about is to design the circuitry first, and only in the end when I am sure that it will not draw too much current, I can connect the 3.3V supply.
It looks like the way to go, am I right ? This may be obvious but I am a bit new to this, so I want to be sure not to break another Pi
Also, while looking up the maximum current I can draw from the 3.3V pin, I found this thread : https://raspberrypi.stackexchange.com/q ... -were-told
telling that while you shouldn't draw more than 50 mA overall from the GPOs, the total current available for the 3.3V pin depends on your Pi's remaining current from the power supply after having fed the board itself + the external devices.
I would like to measure my (future) Pi + devices' current consumption so that I can know which will be my future circuits' limit (minus a safety margin
). How could I do this ? In theory, I would only need to measure the current drawn by the micro USB input, and substract this value to the maximum of 1 amp that the Pi can draw (according to this : https://www.raspberrypi.org/documentati ... /README.md
). But how could I actually measure this value ? Also, am I thinking correctly ?
Thanks for your answers !