I bought some of those from aliexpress a few years ago. Nice little
gadgets. Current offerings suggest "Voltage: 4-20V+/-1%, Current:
0-3A+/-1%" - They just package standard voltmeters into a USB housing.
I don't know about +/- 1%, but when I used them they did coincide nicely
with the under-voltage messages I got from my pi from my DC/DC step down
5V converter which turned out to be not very 5 Volty.
Also, if you have a USB socket kicking out 20V, then you probably have
bigger problems.
I also tried them in series to see how much power they consumed. I don't
recall the value, but it was not trivial.
Tug
On 10/24/24 13:21, Nash JC - NCF via linux wrote:
No info on that. I've been charging a phone from a computer USB and it
started at 0.47 amp and
a little under 5 V. Now phone shows fully charged and 5.12 V and 0.08
Amp.
I suspect it will do 4-6V and 0-1 Amp. Maybe 2 if lucky.
JN
On 2024-10-24 13:17, Jean-Francois Messier wrote:
What are the ranges of voltages and watts/amps ?
On Thu, Oct 24, 2024, 12:31 Nash JC - NCF via linux
<linux [ at ] linux-ottawa [ dot ] org <mailto:linux [ at ] linux-ottawa [ dot ] org>> wrote:
Browsing at Princess Auto in Kanata I found a USB dongle that
displays voltage and current
passing through to 2 charging / download ports. $4.99. Never seen
something like this before.
Thought others might find of interest. Called Voltage Meter with
model W002. In the electronics
area.
JN
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