1792 réponses à ce sujet

[firened]

Looks like it's a charger only, Not an ups, oops.

[firened]

Another suggestion:
- if it has an on off switch, it should cut power to the servos too, but still allow charging. (Servos drain my battery within 5 days when robot is off.)

[Mike118]

This is already the case on vigiups v2.

[garfield2142]

https://www.robot-ma...y=ups&results=3 Is this the vigiUPS v2?

[Mike118]

Yes. Missing pictures because I don't want to promote it too much I am working on v3.

[garfield2142]

I was about to ask for a picture of it to see what it looks like, and maybe buy one

[Mike118]

If you can wait few month I recommend to wait next version. Else I can send you few pictures of this v2.

[garfield2142]

Yes, I'd like some pictures please. Are there any in stock?

[firened]

Not so great ideas:
- charging to 4.0V only, and discharging to 3.2V (no lower than 3V) would increase battery lifetime. Might not be worth or possible to implement though..
- a rotation base & tilt mechanism like they use on PTZ cameras would be sturdy - but reduce movement speed and increase risk of it getting stuck..

[firened]

(- most fuel gauges need constant battery voltage for the % value to work.)

[firened]

@Mike118 yes i think the "battery runs out behavior" was the main problem.

I added a large hysteresis low voltage cutoff (i don't remember the exact values, maybe something like: Off: <3V. On: >3,5V)

[Mike118]

We will need to test this and verify that the new design solve this problem

[garfield2142]

Testing power usage with a variable power supply, on a raspberry pi 4

PowerSupplyTest1.mp4   8,05 Mo

[garfield2142]

Going down to 3.5 volts

PowerSupplyTest2.mp4   5,47 Mo

[garfield2142]

Limiting current to 3.0A then 2.5A, which crashes the pi.

PowerSupplyTest3.mp4   7,04 Mo

[firened]

Nice power supply

[firened]

Crazy to see it actually using 1,5A on idle.... No wonder 1A chargers aren't sufficient.

[firened]

Yeah you got it right.
The reason why Vigibot shows 3,2V while the power supply shows 3,5V is the resistance of the thin cables and ... how many? 3 dupont plugs?
That easily adds considerable resistance.

In your case: R = U / I = 0.3V / 1.5A = 0.2 [U+03A9]

[firened]

Yeah 3A is too low. However most 18650 have a 3A PCM, but since there's 2 cells in parallel you'll get 6A max.

[garfield2142]

I made my own dupont terminated cables from a PC power supply, they are thick compared to the cheap chinese cables. (They are so cheap, they use iron, and can be picked up with a magnet.) For my next test I'll measure a raspberry pi 3b+.