I have a 5V (2A max.) circuit for multiple Attiny84s and a 12V (4A max.) circuit for stepper motors.
Does my negative wire have to have a 6A current rating now? Or will I be able to use less?
It depends
- How long is your wire
- Where the devices and power supplies are connected to the wire
- What kind of wire
- other things
So, please provide a wiring diagram and photos if possible.
Not necessarily but so you are on the safe side.
Surely you would need at least ten Attiny84s with all I/O pins driving 25 mA each, to draw 2 Amps.
Why would you be doing that?
You're not necessarily "safe" with 6 amp rated wire, or even 100 amp. If the wire is very long, the voltage drop may be excessive, even if the wire heat dissipation is acceptable (which is the fundamental aspect of the rating).
Cough cough. A hundred.
The motor driver boards have separate connectors for the motor power. Use separate wires for the 5V and 12V supplies to avoid noticeable voltage drop on the 5V GND line.
You also have to consider whether the steppers will all run at the same time, if not you might be able to derate cables
How would that work since the steppers are always powered?
(I feel Déjà vu just now!)
Yes , in the corner with a funny hat . My mistake not thinking !
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