Power Adapters for the P2 Edge Module Breadboard

CJMJ

I believe I remember @"Ken Gracey" recommending these power modules from amazon: https://www.amazon.com/gp/product/B07W5HMSG3/ref=ox_sc_act_title_2?smid=A2UFPLZYDNEVHB&th=1

I'm not fully versed on QC 3.0 yet but from what I've read these power modules can deliver between 3.2v - 20v dynamically in 20mv increments depending on what the device [ie phone] communicates to it. What voltage will these power modules be delivering to the P2 Edge Module Breadboard which recommends not going above 5.5V? Any ideas? Has anyone used these yet?

Wuerfel_21

Any USB charger will just deliver 5V until told otherwise - what you want to look for is the current output at 5V. non-power USB ports on a PC are rated for 750mA, most chargers are 2A, the linked ones are 3A.

CJMJ

I know all that. I have several different 5V sources here. Some 5V/2A wall warts and a UPS with 5V/2A USB ports. What I'm concerned about are these 18W QC 3.0 wall warts that can deliver up to 20V. It probably has some smart circuitry in it that communicates with the device it's charging to regulate the voltage and charging ampherage. I'm pretty sure these Parallax devices don't have that sort of circuitry built-in. These other power adapters ONLY deliver up to 5V. I'll probably order these and run some tests before hooking up any P2 to it. I'm curious what voltage they default to.

Wuerfel_21

Well, obviously 5V, what else?

Also, some reading up suggests that QC 2.0 (not sure about the higher levels, but it's supposed to be backwards compatible, so yeah) doesn't need any smarts at all, you just put specific regulated voltages on D+/D- with some particular timing

Tubular

No need to overthink it, with QC3 you do get plain 5.0 volts, unless you digitally negotiate for more

My JohnnyMac arrived arrived yesterday, fired it up with this left over from fpga work
https://www.altronics.com.au/p/m8911B-powertran-5v-dc-4a-fixed-2.1mm-tip-appliance-plugpack/

CJMJ

Thanks!