30
votes
Accepted
Robot never goes straight
I'm posting this as an answer because it is the answer.
You can't.
As @BendingUnit22 mentions, you are attempting "open loop" control. Noise and variations will mean that your robot will never ...
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10
votes
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How can we use the accelerometer for altitude estimation?
The barometer carried on the pixhawk has an altitude resolution of 10 cm. If that isn't enough, you could write a kalman filter that uses the accelerometer data in the prediction step and the ...
- 1,843
6
votes
ROS on Raspberry Pi Model 2: UbuntuARM vs ROSBerryPi
The ROSBerryPi page is quite outdated, you actually can install prebuilt ROS Groovy binaries on Raspbian.
You will be better off installing prebuilt ROS binaries rather than building from source on ...
- 106
6
votes
Robot never goes straight
Since the open-closed loop issue is already mentioned, I will give a comment to the "I once tried to run a dc-motor without a load".
Yes you might damage your motor with this but you can also damage ...
- 1,657
6
votes
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How to measure pull force on a (kite) rope?
The component you highlighted is called a tensile load cell. You could buy one from a supplier, but it probably would be cheaper to buy a cheap digital hanging scale and taking the sensor out of it - ...
- 521
5
votes
Accepted
L293D won't turn motor backwards
The motor driver chip you state you are using, the L293D, is a "quadruple half H driver." This means that, instead of two full H circuits capable of driving a motor forward and reverse, you have four ...
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5
votes
Accepted
Arduino or Raspberry Pi?
For interfacing with a camera, I would recommend the Pi. The reason is that the AVR in the Arduino is an ordinary processor, whereas the Broadcom SoC in the Pi was originally designed for multimedia. ...
- 331
5
votes
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What is the difference between ROSberry Pi builds?
Well this is embarrassing. I didn't realize they are in fact different distributions not variants. Also found the page where you can find out more about them: http://wiki.ros.org/Distributions
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5
votes
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Why to combine a Raspberry Pi (or similar board computer) and an Arduino for controlling motors?
The reason is Clock on the Raspberry Pi. Note that the raspberry is powerful but not that powerful that it can run an OS and simultaneously give you precisely timed PWM outputs. I assume that you'll ...
5
votes
Accepted
How to handle power distribution on a robot?
For power management, you can use either a DC/DC Convertor, a linear regulator, or a combination of the two.
DC/DC Converter
A DC/DC Converter changes DC voltage levels. Three common types are:
...
- 295
4
votes
Accepted
Best power solution for my robot
I agree with @Greenonline 's recommendation regarding LiPo batteries along with his warnings on battery care. It seems you will need a fairly small battery, considering your current requirements (...
- 550
4
votes
Should I use an arduino to control my balancing robot's motors?
If you want to have a good balancing, PID loop timing is very important. Standard Raspberry OS, like Raspbian can't guarantee you any precise timing, so once your loop period may be 10ms, once it can ...
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4
votes
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Are robot's codes usually compiled or interpreted?
Robots tend to be portable devices powered by batteries. Portable battery operated devices tend to use embedded processors with limited power and memory. Compiled code has several advantages over ...
- 496
4
votes
PID Control: Is adding a delay before the next loop a good idea?
Don't disengage your controller.
The purpose of a controller is not only to steer your system to the desired setpoint according to a predetermined dynamical response but also to counteract potential ...
- 3,995
3
votes
Accepted
What is required to build a simple XY-stage?
Simple X-Y stages are well understood and form the basis for the many open source hardware projects for 3D printers.
Each axis of an XY stage can be made from a pair of 6mm stainless steel rods, ...
- 4,233
3
votes
Smart Home Model with Raspberry Pi
Though, there is not much information about your servos let's assume that they consume at least 1A each. This value will probably be higher given that you want to move doors and that requires torque.
...
- 633
3
votes
Arduino or Raspberry Pi?
The only issue with having the off-board controller is that the commands to the quad-rotor might lag, because of 1. range to controller or 2. the complexity of image processing code. With that said I ...
- 31
3
votes
Need help regarding odometry using Encoder motor and raspberry pi
You could maybe use Matlab to plot the position of your vehicle? This is how I'm trying to do that:
I have a 'logging'-program running on the Raspberry Pi that counts each sampling time the pulses ...
- 155
3
votes
Accepted
Do I need the 5V to 3.3V level shifter?
The Roombots example you posted does not use a level shifter because they are using the Create USB cable to talk to the robot. If you are planning to use this cable, you do not need the level shifter. ...
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3
votes
Accepted
Quadcopter controlled by Raspberry Pi
The easiest way to do this would be using UART for serial communication. The CC3D has TX/RX/GND pins which you connect to Raspberry Pi.
Now you will need some sort of protocol or data framing to ...
- 188
3
votes
ROS + SLAM + kinect. which platform to use?
There are several platforms possible, depending on your experience level and needs.
If you are comfortable working with the Raspberry Pi or the Beagle Bone... the next step up might be the Jetson TX1 ...
- 295
3
votes
Accepted
Nuc, custom pc or raspberry pi?
Edit:
With the new information in your post I would highly recommend going for more computing power than you think you need. It is always to have a little extra wriggle room than to be stuck with not ...
- 207
3
votes
What other equipment or hardwares I should buy along with raspberry pi
First, it is important to understand the differences between the Arduino and the Raspberry Pi. You can read more here and here.
The Arduino is a microcontroller. It is a specialized board that ...
- 295
3
votes
How to access Raspberry Pi over wifi?
To access your RPi over the WiFi, you can use any SSH client like PuTTY.
Once you have established a connection between your RPi and computer, then you can control GPIOs through a TCP connection. ...
- 536
3
votes
Accepted
Recommended building materials for building a robot WITHOUT 3D printer?
With consideration cheap, strong enough, not ugly and easy to shape, then my recommendation is you can use clipboard. I have seen people win international robotic competition with robot made using ...
- 629
2
votes
Low power to motors -- motor power jumper issue
I had the same problem with the "Ultimate 4tronix Initio 4WD Robot Kit" - the motors make some noise, but do not start moving. I tried using 8 batteries instead of 6 (for higher voltage on the motor), ...
- 21
2
votes
it's worth to make a line follower using a raspberry pi and a web cam?
I did a project based on RPi2 + Pi-Camera + ROS jade + OpenCV to make a line following rover. Two methods are used, one is to find contour of the track, the other is to use Hough-transform for edge ...
- 51
2
votes
Can ROS run on a Raspberry Pi?
Yes. Sure. We've been doing this long time.
ROS is not an "OS" and it's not big. It's just "middleware" which runs well in "Raspbian".
We just burn with the official ...
- 91
2
votes
Raspberry pi quadcopter drifts like crazy
From your sensor code,
I'm not sure I understand what your gyroSmoothing is doing. For one, it's set =1, so it's not doing anything at all currently, but I don't ...
- 15.9k
2
votes
can we detects animals through PIR(passive infrared sensors)
Warm blooded mammals and birds should be similar to humans as far as these sensors are concerned, amphibians and reptiles probably not.
Here are some thermal signatures from sensors that are more ...
- 1,047
Only top scored, non community-wiki answers of a minimum length are eligible