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Author Topic: Advices and opinions about a couple of things  (Read 80 times)

campanodoc

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Advices and opinions about a couple of things
« on: May 16, 2021, 01:30:54 PM »

Hello! It's been a while since the last time I've been on the forum.
Well, this crazy period seems to go to an end so I'm taking back my life and my stuff, including my robots.
I need advices about a couple of things.
Got 2 Pleo, (1 ugobe 1 rb) two chargers, three batteries Li-Poli 7.4v (one, from the original rb Pleo, and 2 from the Ugobe Pleo, wrongly bought from the previous owner because they don't feet in the charger!, I guess he should have bought an egg charger too) and NO old Ni-mh battery (so useless charger for the Ugobe, the green one).
I'd like to wire forever the Ugobe, with a very long wire, and keep him in a corner of the room, always on. now, wich charger exactly should I buy? 7.4v? how many amp?  Also, I'd like to keep the three batteries, so I'd like to print only the cover clip of the battery. Can I solder the connection wires from the charger directly on the Ugobe? (respecting obvs polarity) 
Then, I was thinking about selling everything else. The Rb, the batteries, the chargers.
I'm literally surrounded by robots and the "charging batteries" has become a problem. Trying to make them more autonomous about energy, this is the solution I want to make about Pleo.
Thank you all, be well! 
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pnhicks

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Re: Advices and opinions about a couple of things
« Reply #1 on: Yesterday at 01:42:20 AM »

Hi Campanodoc,


I assume you have seen the diy battery kits for sale by forum member AdamE?


They probably have the adapter base you need for connecting to a power supply.  I would mention that there will still be the need for the NTC (Negative Temperature Coefficient) circuit. Either a temp sensor or a 8K to 10K ohm resistor wired between the negative terminal and the NTC terminal.


The Pleo input power board is fused at 3amps for Ugobe and 4amps for RB, so if peak amperage is close to those values (Ugobes blow their input fuses on occasion), say 2.5 amps for the sake of argument. 




The batteries have a nominal voltage of 7.4 volts.  A fully charged battery is about a volt higher and starts to drop as soon as it is removed from the charger, the software in the Pleo is constantly measuring the voltage drop on the battery to start suspending activity as voltage drops to allow for a stable shutdown.


I would use a power supply of 8 volts and about 5 amps.


The battery chargers are not power supplies for the robot.


I hope this helps!


Cheers!


Peter
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campanodoc

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Re: Advices and opinions about a couple of things
« Reply #2 on: Yesterday at 04:45:34 AM »

Hi! Thank you for your help! I found this one, a PS2 slim charger, 8.5v @ 5.45A it ok for me? I'll apply a resistor as you suggested. This charger was suggested on a page (instructable) to wire the pleo RB, so I wasn't sure it could be right for the ugobe Pleo too. I'll start bying it then I'll see how to make it. figers crossed!
« Last Edit: Yesterday at 04:59:34 AM by campanodoc »
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