Raspberry Pi Forums

TheNumericDolfin

OK, so i took a look at that specialized battery, and it definitely looks intriguing. The problem lies in that this solution would only work for the pi part of the robot, and would not allow function for the rest whilst charging. Ideally, I would need a circuit that could take a signal from a GPIO p...

TheNumericDolfin

OK, the regulator should(In theory) make sure that the voltage does not vary too much. As long as at least one battery is providing 2.1 amps to the pi, would there be any danger of burning out the pi or accidentally shutting it down? As long as all batteries do not run out at once and provide at lea...

TheNumericDolfin

If using 3 x lipo cells in parallel stepping upto 5v why not also use 3 x tp4056 charge management boards and some additional circuitry to issolate cells from load 1 by 1 for charging. That is a very good idea, but i am a little unclear as to how exactly i might set up such a circuit. What would be...

TheNumericDolfin

I am guessing the blue rectangle labelled 5v is a boost regulator? And the 'irrelevant control circuit' is a motor controller? You don't seem to have any battery balancing in place, just three Lipos connected in parallell. I would not recommend this, as it complicates matters. Better to stick to a ...

TheNumericDolfin

How can i safely connect batteries in parallel, then? using one big battery large enough would be intolerably expensive. Also, I looked it up and google says that lithium batteries cannot charge while discharging. Am I not understanding something that would allow this to happen? and yes, the labeled...

TheNumericDolfin

: pi circut.png (27.98 KiB) Viewed 1187 times

Here is my basic circuit. Works, except that the pi must turn off when charging due to the limits of rechargeable batteries (cannot charge and discharge at same time). I would like to be able to control robot while charging. Is there any way to accomplish this?

TheNumericDolfin

Thank you for your help guys.

TheNumericDolfin

Basically, I want the servo to not fight to keep its position like it normally would. Once you run the code, the servo is always trying to get to a specific angle. This is not ideal when the servo is only needed for a few moments.

TheNumericDolfin

from adafruit_servokit import ServoKit import time kit = ServoKit(channels=16) while True: kit.servo[15].angle = 180 time.sleep(1.2) kit.servo[14].angle = 180 time.sleep(1.2) kit.servo[15].angle = 0 time.sleep(1.2) kit.servo[14].angle = 0 time.sleep(1.2) kit.servo[14].angle = Null time.sleep(4) I ca...

TheNumericDolfin

Ok, so it was not as horrible as it first seemed. I still have no idea what caused it to crash, but I booted in recovery mode afterwords. I reinstalled everything, and my original problem was solved! Thanks for you guy's help, and even though I still have no idea what I did.

TheNumericDolfin

what do I do? was my pi just ruined? I did not do anything wrong, I just updated it!

TheNumericDolfin

ok wtf... I ran that command, the pi restarted really glitched out. There were no icons, then it crashed and now refuses to start. What the hell happened?

TheNumericDolfin

hey, sorry for the delay, I was in France for the last week. the output is what is shown in the previous comment. I think that perhaps I do not have the server running. What is the command to run realvnc from terminal? Thanks!

TheNumericDolfin

The option is gone from raspberry pi configuration menu, and the realvnc server is not anywhere. It should be in taskbar, but it is not.

TheNumericDolfin

My pi seems to be having a problem with realvnc. when I try to enable vnc, the option is gone. I do not mean greyed out, i mean GONE. Additionally, vnc server is not showing up if I install it. Any suggestions?

TheNumericDolfin

Ok, so 9 volts will not work? That is fine, I just need it to work with the pi GPIO pins, so I will find a way to use 5 volts. Where should the power pin be connected?

TheNumericDolfin

I have been trying to get a motor driver working for some time now, and I am completely stumped. I have hooked up the components in the following fashion, yet the motor does not turn. I have quadruple checked the connections, and the motor and drive chip and battery and wires are all working when us...

TheNumericDolfin

I meant vnc, sorry

TheNumericDolfin

I use tightvncserver

TheNumericDolfin

I tried cheese, and it worked great on the pi itself, but does not run over vpn. Running on terminal does not work either. I did the same with Camorama and Guview and tried others. Several work on the pi, but none work over vpn. I have like six different apps, and none work.

TheNumericDolfin

Hey guys, this is my first post. I may have this in the wrong section, but if that is true, please forgive me. I wish to stream video from a usb webcam on my pi via vpn to my main computer, making a wireless cam. There are plenty of camera apps for the pi, but all of then do not work over vpn. I am ...

Search found 21 matches

Re: irritating battery limits

Re: irritating battery limits

Re: irritating battery limits

Re: irritating battery limits

Re: irritating battery limits

irritating battery limits

Re: adafruit 16 channel servo driver will not let me make servo go limp

Re: adafruit 16 channel servo driver will not let me make servo go limp

adafruit 16 channel servo driver will not let me make servo go limp

Re: realvnc and pi

Re: realvnc and pi

Re: realvnc and pi

Re: realvnc and pi

Re: realvnc and pi

realvnc and pi

Re: L293d problems

L293d problems

Re: Camera on screen

Re: Camera on screen

Re: Camera on screen

Camera on screen