power

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.

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?

 

how may i get a constant power supply of 4.5 Volt

using batteries?

 

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.

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. 

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

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!

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 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.

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... 

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 :

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.

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?

 

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.......... 

 

 

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.

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.

Is there a common formula for finding required motor strength?

If I know the total bot weight and wheel diameter, could I find out what kind of motor I need. I know that gearing will come into play, but I dont know anything about these physics thingys so I choose to phrase the question as vaguely as possible.. 

Like, what kind of specs would a motor for a scooter (with me on top of it), doing 35km/Hrs require

or,  an offroader weighting 10K, doing 3km/Hrs with 10cm big wheels in rough terrain?

I'm using RC ESC's to drive the motors in my current robot project. These speed controllers has a built in power regulator (called a BEC) that is meant to power your RC receiver. I've measured and the voltage produced is a steady 5.03 Volts.

Can any of you think of a reason why I couldn't or shouldn't use this as power source for my Picaxe 28x1 ? 

 

Can't seem to insert hyperlinks with Opera browser on my old iMac, so here are a link if you wanna read more about RC ESCs or BECs

http://en.wikipedia.org/wiki/Electronic_speed_controller

Hi all,

I am very new to building robots and don't have much knowledge of electronics, apart from the basics many years ago at school.

However, I got an arduino at the weekend and have started doing experiments with it. I've just managed to take apart a cheap RC toy car and get the arduino to make it go backwards and forwards via a L293D motor driver and a very basic program. There are two motors in the car - the other one is a DC one attached to rack and pinion steering - I've not connected this to the other side of the L239D though yet.

Hello

I've been running around past few days trying to figure out a suitable power source for my yet to build robot. It will be powered by two 12V gearmotors (about 1amp stall), on a simple diffrential drive. I am looking for a balance between power consumption and efficiency. My rough estimate is that the robot will weigh under 1kg (2.2lbs) after construction. 

Would this motor lift me?  150 lbs or so?

 

http://www.superdroidrobots.com/shop/item.asp?itemid=722

 

Its for my walking chair, it will be chained to a shaft and the shaft will have about 150 lbs (NOT static load) or so of force to deal with.

 

Thanks :)