Let's Make Robots!

power

This is yet another of my data loggers for my brother. He needed a low power data logger that would fit inside a 50mm acrylic pipe. So this is what I came up … Read more

Raspberry Pi Lego car

Hello all,

I'm making my first robot using Raspberry Pi. My robot looks like a car with three wheels. Two of them are in front and have connection to motors, The third one is behind and it's no connection to motors.

I'm planning to use 2 simple motors (for each front wheel one). For now my robot weight 260g, and i have to add two motors and battery and i little of more constuction for holding motors and battery. I'm already found which type of motor should i use:

Motraxx MOTOR X-FLY 400 or Moteaxx MOTOR X-FLY 280.

Multiple power supplies, one way.

First off, I'm using a Pixaxe board.

Considering the juice that can be used by periphrials, I wanted to use it's ability to use multiple power supplies,
one for the board, and one for the "output devices". However, a small question, just to be sure:
 A SHARP sensor is NOT consiered an "output device" on the board, right? I think it's not, but making sure...

Anyhow, I wanted to run the motors up to their maximum 5v-6v capacity.

Powering a switch through another source

I have a device that needs a 12v power supply to activate, and my controller is only 5v.  My 12v device only needs to be activated during a certain event that the controller senses.  Is there a way that I could have the controller power a switch of some sort that turns on power to the 12v device, i.e. a switch that is activated when power is supplied?

 

Thanks for the help.

5v Step Up question

http://goo.gl/TLX3B

 

Does anyone have experience with this type/brand of step up 5v converter? I'm comparing it to the Pololu one here: http://www.pololu.com/catalog/product/798 which is slightly more expensive, and then you get hit with shipping costs (for me it's about the same price as buying a second module).

 

Comparison:

Pololu 5v step up ($5.45 + SHIPPING)

Help with V2 on picaxe 28

While I have used my picaxe board for alot, I have never used multiple power sources on it. I have read the "Picaxe for dummies" but I feel like Im missing something. is there anyone who has a pic of thier 28 board hooked up with 2 power sources? I just need to see the wiring. Also, I'll be connecting it to 6 "AA" batteries as power (its a hacked RC car) Is that any problem? Thanks all, the sooner I figure it out, the sooner dog-bot lives!!!

how do I determine power requirements for an 18 towerpro mg955 servo hexapod?

I recently bought a Chinese made hexapod and 32 servo Torobot controller.  Hooking up the bluetooth module to the controller was easy, and so was connecting all 18 hexapod servos, and the programming looks straightforward.

the servos are towerpro mg955.  I have found various info on these (including comments re their quality) but was not able to find out anything about how much current they can use/need under load

Advice on these Chinese DC - DC converters?

SO, I got a couple of these 80w DC - DC buck converters to supply power to Houston.  One is going to be the 5 volt supply for the servos, the other is going to be a 7.2 volt supply for the Rover 5.  Last night I got a motor out and adjusted them to the proper voltages.

The thing that's got me confused is the "constant current" part.  There are two multiturn pot type adjustments.  When I ran the motor, it pulled about 350ma turning the current pot didn't seem to change anything.

Which power supply setup do you prefer?

So I want to buy some AA's and power up my Tamiya twin motor gearbox.

I would go for B, because A will discharge uneven. But B will discharge equal. The only problem is, that ONE DC motor uses max 3V. So when only ONE is active, it will take a punch of 7,2V instead of max 3V

 

So which of these do you prefer? A or B?

 

constant 4.5 V supply using batteries?

how may i get a constant power supply of 4.5 Volt

using batteries?

 

Building Stair Climbing Robot and have power question.

I am building a stair climbing robot for a class that will carry a basket full of rubber stamps to the top of a staircase.  My robot will be loosely based off of this robot --->http://letsmakerobots.com/node/8355.  I am planning on using an Arduino Duemilanove for the microcontroller.  I am planning on using 5 dc motors to power the four wheels on the ground, and 1 continuously rotating servo to power a wheel rotating at the front of the robot which comes into contact with the stair first and projects the device upwards.

Best way to Power an 8 servo - Quadbot

Hi. I want to power a Dagu Qadbot without sources, only batteries, but don't know the best way to Do it. It uses 8 micro servo - 8g, 4~6V, and draw a current that I don't know the specific value as I didn't find a Datasheet.

 

So, as I'm almost sure that only Arduino will not be able to power the 8 servos, I'm thinking about 2 solutions:

 

1st - Use 4AA Battery to power - the Arduino i parallel with the servos. This way I'd power the servos directly and just connect the digital pin to the arduino. 

What batteries to power my Arduino robot.

I would like to know what type of battery setup I should use for my robot. I have 6 AA batteries powering my motors so it's just everything else... which currently consists of...

Arduino UNO

SN7...etc.   H bridge motor driver chip

Mini Servo

Sharp IR sensor

My Arduino 2560 Power on, Won't upload

I just bought an Arduino 2560 Board, I was using it with windows 7 and it was working perfectly.

The problem is that now the Arduino is not detected by any of the operative systems, I am currently testing with Mac Snow Leopard, Linux and windows 7. The reset botton is working, and when I plug it to the computer the Power LED turns on......

Any suggestions on how to fix this? 

 

THANKS!

AC wall power

I need to power 2 picaxes and 25 LEDs, each with it's own 1k resistor. Also a small DC motor. I would like to use an AC adapter, but only what is necessary (need the others for later). I have three 5V adapters: 250ma, 400ma, and 1A. Which should I use?

ok i need someone who knows about nortons and thevenins also maximum power

ok i got this assignemt today to do for tomorrow i have done the first question but i dont understand the second one can anyone help me out i would love it.

i dont know what this LED is ... any ideas ?

ok i have a few of these LEDs and i dont know what they are for i think they might be IR LED, i have tried putting a power source through them from 3-9V and it does nothing. any ideas at all i have about 500 of these my friend gave me and not a clue what they do... 

I am confused about how to use LiPo batteries

Hi all,

I am currently working on a new robot and I will soon have to choose a way to feed it with power.

I've been reading about LiPo batteries, but I am still confused about how to integrate this kind of power supply in a robot. Here are a few questions I have in mind :

Gives push button the typical ON/OFF toggle function.
Hi everyone, this is my first walkthrough, hope You'll enjoy ;-) ___Where the story begins___ I wanted to use a PC PSU as power supply for my works and I was … Read more

Question, can servos "leak" power?

Hi LMR! If you haven't seen my robot MAEP already, it has two power supplies, one for the motors and one for the Arduino. I decided to add an LED indicator to show when power is being supplied to the motors (which are servos). The LED is just connected in series with a 1k resistor to the power lines from the motor power supply, a 4.8V NiCad battery. As you expect, the LED is off when motor power is off and on when the motor power is on. But when just the Arduino is on and not the motors, the LED is lit dimly, and changes brightness as I wave my hand over the sensors.

Powering an Arduino: batteries/USB

I have an Arduino, with a Sharp IR sensor connected to it, and code that basically says:

If analog value from Sharp > certain value, turn LED on.

else, turn LED off.

When I plug my Arduino into my computer, and power it via USB, this works perfectly.

However, when I power it by batteries (4 x AAA), the LED is always on, even when there is nothing near the Sharp at all. Can anyone give an explanation of why this happens, or a solution to this problem?

motor selection......

 

hi,

the weight of my robot is 12-14kg.....i am having a serious problem in selecting motors...

 

motors must must have good rpm

must have torque 

must  have feedback (for differential drive , positioning and controlling)

must have power to drive 12-14kg.....

 

plz provide me guidance.......... 

 

Running a MicroController off a SuperCap

Because I keep daydreaming about wiring up my house with dozens of sensors, I was wondering how hard it would be to power a micro controller (say picaxe) off a super capacitor.

A supercap is an electrolytic capacitor with an insanely large capacitance. Mine is half a Farad, 470000 uF. But is rated for only 5.5 V. That's the deal with these caps. Higher capacity at the expense of the maximum voltage they can endure. Or simply at an expense. This one costs about $4 at DigiKey.

Power for the TI LaunchPad

 

Power for the TI LaunchPad can be supplied via the USB connector. The USB power is +5V. Apparently the onboard FTDI chip converts the 5V to 3.3V for the MSP430 microprocessor. The micro power is 1.8 to 3.6V.

I'm planning a home-made shield for the LaunchPad, and I will need more than just the 3.3V for motors, servos, sensors, etc. The 3.3V from the FTDI is very current limited anyway.

RC plane Project Part 11 - XBee Pro Field/Range Test

RC plane Project Part 11 - XBee Pro Field/Range Test

(NonStream Link) XBee Pro Field/Range Test 

At last i have done some field tests with the Xbees ..........

...... I have been jumping/running around my local flying field .......

..... even on the lowest power setting i was able to Rx a good clean signal....

Psx Library and dc motors, possible power issue?

Hi everyone! First let me just say I love this site.It's an enormous wealth of information for an enthusiast like me. I have a few concerns with a project I am working on and would love a little input.