Customer:
I have a question about power supply. First, the Croduino is powered via USB. When connecting components to the expansion board and Croduino, the power comes from USB.
What is the maximum load on the USB port?
Second, I can only establish a common GND (ground) connection, but use the positive pole from an external power supply. When controlling an electric motor that draws higher current, I need to do this safely.
Original message (Croatian)
E-radionica!
Imam pitanje u vezi napajanja.Kao prvo croduino se napaja preko USB priključka.Kada se povezuju komponente na exp. pločici i croduino, znači napajanje je preko USB-a.
Koliko se može max. opteretiti USB priključak?
Drugo, ja možem ostvariti samo zajedničku GND (masa) vezu,
a plus pol koristiti iz vanjskog napajanja.U slučaju da upravljam
el. motorom ,koji “vuče” veću struju to moram sigurno učiniti.
Hvala!
[name removed]
Originally submitted via email support on 11 March 2016. Migrated to the forum for community visibility.
Soldered Support:
Yes, that is correct - in that case the power comes through USB. The USB 2.0 standard supports up to 500mA. Croduino also has a fuse at 500mA, so if you draw more current or create a short circuit, the computer will trip its fuse (you will need to unplug and replug the cable), and Croduino will be unusable for 10-20 seconds until the fuse resets.
Yes, you can share GND with any larger power supply, and connect the positive pole directly to your load. You should never connect a voltage higher than 5V to Croduino. You can also use the VIN pin which is connected to the voltage regulator on the board - if you only have a power source with voltage higher than 7V.
Original message (Croatian)
hvala na upitu!
Tako je, u tom slučaju napajanje ide preko USB-a. USB 2.0 standard podržava do 500mA. Croduino također ima fuse(osigurač) na 500mA, tako da ako povučete veću struju ili recimo napravite kratki spoj, računalo će prekinuti svoj osigurač(morat ćete ukopčati pa iskopčati kabel), a Croduino na na 10-20ak sekundi biti neupotrebljiv dok se osigurač ponovo ne spoji.
Tako je, GND možete dijeliti s bilokojim većim izvorom napajanja, a pozitivan pol možete spajati direktno na Vaše trošilo. Na Croduino nikada ne biste smjeli spajati napon veći od 5V. Uvijek možete koristiti i VIN pin koji je spojen s regulatorom napona na pločici - ukoliko imate samo izvor napajanja koje je većeg napona od 7V.