# Questions tagged [power]

In physics, power is the rate of doing work.

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### Arduino Power Adapters

I'm shopping for my first Arduino with a specific goal in mind. I need to attach 3 standard servo motors, an ArduCam Mini 2MP camera, and several LEDs. I'm trying to figure out power requirements. I ...
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### Powering 6 servomotors requiring 6V and 2A each

The title pretty much says it all. I'm on a team that is currently building a robotic arm for the capstone project of my engineering degree, our design is similar to the Dobot (5 degrees of freedom). ...
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### Sizing high current power supplies for large robots

I'm a researcher in a lab that's starting work on some larger humanoid/quadruped robots as well as a quadcopter. Currently, we have several power supplies that have a max rating of 30V/30A and our ...
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### Switching scheme for vector controlled pmac drive

I have 28 pmac motors (3-ph, 230 volt of 0.5 kw, 1.05kw an 1.21kw) in motor control center. Please suggest a time staggered switching scheme in order to avoid tripping due to voltage sag, swell , ...
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### How to calculate the current consumed by a brushless motor on a quadcopter

I want to create a virtual quadcopter model, but I am struggling to come up with a satisfying model for the brushless motors & props. Let's take an example, based on the great eCalc tool: Let's ...
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### Powering my robot with 12V battery which is charged by a gas/petrol generator while the robot is operating?

A have designed a robot to perform tasks in farms. But the problem now is I'm not sure on the best way to supply continuous power to my robot. All the motors are rated at 12V and only Arduino and a ...
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2 votes
1 answer
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### Extending iCreate battery power for auxilliary equipment

I plan to use the icreate as a platform to carry a tablet, or notebook PC and want to have power for some time so I need more than the 3000 mAh battery. I want all to be powered from same battery ...
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1 answer
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### Wiring necessary to route power from any one of several rechargeable batteries

I'm looking for my robotics project to draw its power from one of 3 rechargeable batteries; basically whichever has the most "juice" in it. From the initial research I've already done, I believe I ...
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1 answer
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### Understanding how solar panels can supply power to robotic circuits

Say I have this solar panel that outputs 6V at 330mA, or ~1.98 Watts. If I connect that to Arduino, which expects a 5V supply at (roughly) 50mA, then the Arduino as a whole requires 5V * .05A = 0.25 ...
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### How to determine how long a battery will power a robotic circuit for?

Obviously robotic circuits draw different amounts of power/current. So given the same battery, say, a 9V, then connecting it to 2 different circuits will deplete it at two different rates. Robot/...
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### Why do my ESCs stop working?

I'm new to robotics and this is my first time building a quadcopter. I'm unable to work out why I keep losing ESCs. Most recently in testing, I've managed to calibrate all 4 ESCs and accurately ...
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### Help with ultrasonic sensors on obstacles avoiding robot

Well, I will start directly in my problem. I'm working on a project and I only have 10 days left. The idea is simple, a wheeled robot with 3 ultrasonic sensors to avoid obstacles. I've developed a ...
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2 votes
2 answers
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### Calculating thrust generated from electric engines

I wanted to calculate the amount of thrust generated from the engines. I am using the blade 180 cfx model. http://www.bladehelis.com/Products/Default.aspx?ProdID=BLH3450#quickSpecs After some ...
3 votes
1 answer
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### Battery system for a robot with a RaspberryPi or microcontroller

I'm building a robot which is actually a rotating ball. All my circuitry will be inside this ball. I'm using a Raspberry Pi as the brains. Apart from Raspberry Pi, I've an H-bridge IC (L298N), a 6-...
1 vote
4 answers
484 views

### Passing power through a motor

How would one go about passing power through a motor? Let's say we have some basic robot which has a motor that slowly spins a limb, on each end of that limb, there is a motor which again spins a ...
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1 answer
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### beaglebone black power supply for hexapod [duplicate]

I am trying to build a hexapod with camera interfacing using a beaglebone black for college project. I'm not sure what power supply to give so it can power up to bot, having in mind that it should be ...
2 votes
1 answer
395 views

### Powering a multirotor with dedicated batteries for each motor

I'm currently thinking of extending the battery life of my quad by powering each motor and ESC individually. I will be using 1 dedicated battery for each motor, and 1 dedicated battery for the flight ...
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### Linear or Switching Power Supply for a Embedded Project

Power Block Designing noob here. I have a beaglebone 2x XbeePro(s) and another 500mAh device connected to the board i am building a PCB Around. I need some advice on weather to use Linear Voltage ...
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### Need a Relay Alternative

I have an application that needs a XBee and another module to be turned on and off digitally via a microcontroller. The Setup is 2 XBee's and an application board is connected to the Microcontroller. ...
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4 votes
1 answer
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### How can I power a wheel but let it spin freely when not under power?

How can I power a wheel but let it spin freely when not under power? I saw the question How can I modify a low cost hobby servo to run 'freely'? but I'm more interested in knowing if there is ...
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7 votes
2 answers
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### I want to control a sewing machine motor; need help with choices

I've got an industrial sewing machine (think "can sew with thread that looks like string, and has no trouble pounding through 20 layers of Sunbrella fabric"); it's got a 1 HP motor to power it. (I've ...
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1 answer
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### Comparison of the efficiency of DC motor current limiting / control methods?

I am using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
1 vote
2 answers
374 views

### Power switch and common ground on a battle robot

I am constructing a 5.44Kg Hobby-weight battle robot and one of the safety rules is that the robot must have a power switch that turns off power to the motors (and weapon). The robot has three sub-...
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3 answers
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### how to power extra usb devices for beaglebone black

I'm building a robot that uses a beaglebone black, however I have several different usb devices that I want to connect to it (microphone, usb sound device and some other things). Now I have heard that ...
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### What are some generally accepted lift capacity guidelines for multirotors?

e.g. what general multicopter configurations would be generally accepted as recommendations to lift 0.5kg, 1kg, 2kg, 4kg, etc. Is there any general correlation between number of motors on a similar ...
2 votes
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### McKibben artificial muscles and the 400:1 ratio

I was recently reading that those artificial muscles had the highest power/weight ratio while electric motors only have a ratio of less than 100:1. As electrical engineer I have never worked with ...
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### Servos power supply in Quadruped Robot

I'm facing a problem while building my quadruped robot which is figuring out the efficient power supply needed for the 12 servos. I'm using 12 MG995 tower pro servos powered by 2 lithium batteries 2x3....
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2 answers
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### Battery system with and without mains voltage attached

I'm working on a project where mains voltage will sometimes be disconnected, and the system will have to run on battery for as long as possible before doing a (safe) shutdown. The desired behavior is ...
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3 answers
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### How to calculate the power required to drive a fan

I need to specify a fan motor combination and wondered if there are formulas that can work this out? The fan we are using is a crossflow fan: So I'm assuming the power required to drive it is derived ...
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### Power Model for humanoids

I am in the process of creating a Power Prediction Model for the Hubo Robot. The Robot has 38 Degrees of Freedom and has a computer some sensors and motor boards. The motors are powered through Motor ...
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5 votes
1 answer
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### Powering down servos completely in RobotC+Tetrix

For a certain robotic application (actually for the FTC challenge this year) our team is performing an operation where a servo-driven arm could potentially be forced into an unknown position. We are ...
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### Choosing correct power supply for Stepper Motors

I am building a machine and need 2 Stepper Motor for that. The motors are driven using by a 3.3v arm device. I have made the following selections regarding the stepper motor, stepper motor driver and ...
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3 votes
1 answer
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### How to control a brushless motor?

I consider using a brushless outrunner motor, designed for helicopters, in my driving roboter. How can I control such a brushless motor with my micro controller? Of course I'll have a separate power ...
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3 votes
1 answer
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### lithium thionyl chloride batteries to generate 20A @ 14.4V

I am building a robot where power density is critical, and looking into using lithium thionyl chloride (SOCl2) batteries. I will be drawing around 20A constantly and need between 12 and 17V. The ...
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1 answer
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### On the ardupilot board, what is the difference between A10 / A11 ground pins and the PWM ground pins?

I'm looking for an electrical explanation of the statement here: Warning: Do not connect power (red + & black -) from the RC10 (A10) & RC11 (A11) connectors to the servos, just use the ...
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### Single power source for electronics and actuators

It seems popular to build robotic systems with separate supplies for the electronics and motors/servos, but what would be involved in a circuit that powers both from one source? If it helps, here is ...
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### Does more "Power" (W) means better motor?

If a motor has more Power (W) from another it means that it is better?
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### Learning about embedded systems [closed]

The last robotics project I worked on involved autonomous outdoor navigation, using a microcontroller for lower-level control and a computer for image processing and decision making. I worked more ...
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### Additional Power to DC Motor via Second Power Source

How can I provide more power to a DC motor that is in series behind a receiver circuit hacked out of a cheap RC car without burning up the receiver board? The board runs off two AAs at about 3V. I'm ...
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2 votes
1 answer
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### How do I interface a TLC5947 with small motors?

This is a follow-up to this question: Prototyping a device with 25-100 small DC 3.0V motors, is Arduino a good fit? I've decided based on the answer that sending the control signals through multiple ...
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### Arduino Motor control

I'm working on a rather low budget project, and need some way to control four or more motors using one Arduino. I've looked at motor shields a little, but I have a shield on top of it already, It does ...
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3 answers
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### How many amps do I want my Switching BEC to provide?

I'm trying to power 7-12 servos, and I was under the impression that each one would need about an amp, but in looking around for an appropriate BEC to supply them, I notice that most seem to output ...
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7 votes
2 answers
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### Why does our LM2576 circuit suddenly cut down the power?

I have an LM2576 circuit plus an adjuster to adjust the output voltage, for controlling motor speed in a line follower robot. The circuit works great when adjusted to give out low voltages, but when I ...
37 votes
4 answers
46k views

### Quadcopter liPo battery weight/capacity trade off

I'm trying to find where additional battery capacity becomes worthless in relation to the added weight in terms of a quadcopter. Currently with a 5500 mAh battery, 11.1V, I can get between 12 minutes ...
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19 votes
3 answers
3k views

### What is the best way to power a large number (27) servos at 5 V?

I apologize if this question may sound a little vague. I am working on a robotics project that will contain 27 servos of various sizes and I am having trouble figuring out how they should be powered. ...