Questions tagged [raspberry-pi]

The Raspberry Pi is a credit-card sized general purpose computer. Questions about Raspberry Pi but not related to robotics are off-topic, but may be asked on Raspberry Pi Stack Exchange.

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111 views

Smart Home Model with Raspberry Pi

I'm still new to RPi and I am currently trying to do a smart home model. I planned to use RPi only to control 5 servos (which will be controlling the open/close of the doors by setting the angle) ...
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1answer
40 views

What rating Li-Po battery should I get for this configuration?

I will have this configuration: A2212 Brushless Motor 1000KV - 4 each ECS - 30A Electronic Speed Control (ESC) - 4 each Propeller - 1045 Propeller CW & CCW Pair 10 inch * 4.5 pitch Arduino Mega ...
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1answer
608 views

Quadcopter refuses to fly when the Yaw PID component is added

Good day, I would like to ask why is it that when I add the Yaw control to my PID controller for each motor. The quadcopter refuses to take off or maintain its altitude. I am curently using a ...
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1answer
3k views

How can we use the accelerometer for altitude estimation?

I am currently implementing an autonomous quadcopter which I recently got flying and which was stable, but is unable to correct itself in the presence of significant external disturbances. I assume ...
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2answers
1k views

Name of large robotic arms (two finger) with wrist, arm, hands and spinning shoulder axis

I've been looking for large robotic arms (with two fingers) and the arm so they are able to pick up and drop things in a space around the arm (and even spin around the 'wrist'). I'm not sure what the ...
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1answer
588 views

How difficult it is to build simple robots (for example Line follower) using raspberry pi and ROS? [closed]

I want to build a low cost robot, running ROS for educational purposes. It can be a simple line follower using raspberry pi and an IR sensor. Is it overambitious as a beginner project? How difficult ...
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1answer
60 views

How to make a Raspberry Pi? [closed]

I'm currently a robotics hobbyist and am full fledged in Arduino and I have used the Raspberry Pi to make some robots and PCs. Currently, I am thinking of making my own Raspberry Pi, from scratch, on ...
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2answers
1k views

PID Tuning for an Unbalanced Quadcopter: When do I know if the I-gain I've set is too high?

Good day, I am working on an autonomous flight controller for a quadcopter ('X' configuration) using only angles as inputs for the setpoints used in a single loop PID controller running at 200Hz (PID ...
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2answers
2k views

L293D won't turn motor backwards

My small robot has two motors controlled by an L293D and that is controlled via a Raspberry Pi. They will both go forwards but only one will go backwards. I've tried different motors and tried ...
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6answers
6k views

Robot never goes straight

I am using 2 identical DC motors and a castor wheel. The motors are connected to L293D motor driver and are controlled by RPi. The robot is not going straight. It veers off to the right. I am ...
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1answer
697 views

Quadcopter PID Controller: Derivative on Measurement / Removing the Derivative Kick

Good day, I am currently implementing a single loop PID controller using angle setpoints as inputs. I was trying out a different approach for the D part of the PID controller. What bought this ...
6
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1answer
2k views

CC3D - Replacing RC emitter with an RPi

I am trying to control a quadcopter using te OpenPilot CC3D board and a RaspberryPi. The main idea was first replace the signals from the RC emitter to the CC3D RC receiver for an RPi connected ...
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2answers
567 views

Establishing Data Transfer between two Raspberry Pi's using GPIO

Good day I am currently implementing an autonomous quadcopter with stereo vision using raspberry Pi. One (Let's call this Pi_1) is responsible for stereo vision the other is responsible for motor ...
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0answers
80 views

how to actuate pneumatic muscle by the signals received by emg sensors interfaced with raspberry pi?

My aim is to actuate a pneumatic muscle based on signals received by EMG sensors placed on the biceps. Is there any Matlab code which can process the received EMG signals and convert them into any ...
0
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1answer
406 views

Quadcopter program execution time optimization using Raspberry Pi by increasing i2c baudrate

Is it possible to speed up execution time of a c++ program in raspberry pi solely by increasing the i2c baudrate and increasing the sampling frequency of the sensors? I have the issue of sudden ...
6
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2answers
4k views

Quadcopter PID Control: Is it possible to stabilize a quadcopter considering only angle measurements?

Good day, I am a student currently working on an autonomous quadcopter project, specifically the stabilization part as of now. I am using a tuned propeller system and I also already considered the ...
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0answers
618 views

CC3D OpenPilot - Communication port

I am building a quadrotor with a CC3D (OpenPilot) and a RPi. My first idea is trying to communicate the CC3D with the RPi using the main port of the first one but I can't find any information about ...
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3answers
395 views

Best power solution for my robot

I've built quadruped robot which is using 12 servos (TowerPro SG90 Servo) and Raspberry Pi (model B 1). Right now I'm "feeding" it with 5V 2.5A charger. How can I make it un-tethered? What should I ...
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2answers
385 views

ROS on Raspberry Pi Model 2: UbuntuARM vs ROSBerryPi

Before I ask my question, I'd better confirm that I've read the most prominent post about running ROS on Raspberry Pi devices. That post contains some valuable information, but it's a bit dated, and ...
3
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2answers
624 views

Quadrotor - Control system, where to begin?

I am starting to assemble a quadrotor from scratch. Currently, I have this: Structure; an IMU (accelerometer, gyro, compass); 4 ESCs and DC motors; 4 propellers; Raspberry Pi to control the system, ...
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4answers
264 views

I can't get motors to turn with Raspberry pi

I want to turn some motors using my raspberry pi. I am able to turn an LED on and off using the 3.3V GPIO pin. For the motors, I tried using a L293D chip as per the instructions on this link. What ...
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1answer
2k views

can we detects animals through PIR(passive infrared sensors)

as i dont know that what kind of radiation animals emit. as humans emit IR radiations so PIR sensors help to identify humans. pls suggest me if someone have knowledge about sensors which detects ...
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1answer
631 views

iRobot Create 2 serial battery power

I don's seem to be able to get any battery power from Create 2. I spliced the original cable it came with, and tried to use the power from red/purple(+) and yellow/orange(-) to power a Raspberry Pi2, ...
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2answers
188 views

Raspberry pi quadcopter drifts like crazy

I have recently built a raspberry pi based quadcopter that communicates with my tablet over wifi. The problem is that it drifts a lot. At first I thought that the problem was vibration, so I mounted ...
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2answers
73 views

Arduino mobile robot

Is there a way I can control my arduino robot from anywhere in the world. The robot goes out of range of my home wifi so my wifi shield can't help. Is there a way to make sure the robot is always on ...
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1answer
455 views

How to cut throttle signal to ESC properly?

I have a 16 Channel Servo Driver board from Adafruit (see here), and I communicate to it via I2C using a Raspberry Pi. The servo board is controlling a Qbrain by sending a PWM pulse between 1ms to 2ms ...
3
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2answers
4k views

What is required to build a simple XY-stage?

In the scope of my PhD, I would like to build an automated microscopy set-up that should take images of a sample of 2cm by 2cm. This should be done by taking pictures of 500 micrometers by 500 ...
0
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1answer
852 views

Raspberry Pi Hexapod 18DOF, Best servo control board?

Recently I've bought a hexapod kit and 18 TowerPro MG995 servos. My objective is to apply also the Pi camera, sensors and perhaps a claw... So I've been researching and I haven't found a clear answer ...
3
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2answers
3k views

Can I control more than 18 servo motor with a Raspberry Pi

I'm trying to make an hexapod with 18 servo motors and i'm asking how to control them with a Raspberry Pi. (Never used it). I saw lot's of stuff to control 1, but 18, 20... Currently I'm working on ...
3
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3answers
852 views

Sensing the level of a liquid in a tube

I'm looking to build a sensor which will detect the level of liquid in a tube. It does not have to be precisely accurate, just detect whether the level is approximately above a certain height. The ...
0
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2answers
2k views

Using 20 Servos at once, with raspberry pi [closed]

I have recently been asked to review a raspberry pi hat (from a programming view) that will allow PWM control of upto 16 servos, however I am hoping to use this time to work on a hexapod idea I have ...
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3answers
81 views

How can I communicate wirelessly between a RasPi and servo?

I want to use a Raspberry Pi to pan a camera mounted on a servo wirelessly from ~100 feet away. What are some good servos and transceivers for this? To clarify, there should be no physical connection ...
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2answers
249 views

Low power to motors — motor power jumper issue

I'm currently working on my first robotics project using the Initio kit from 4tronix powered by Raspberry Pi. The setup was fairly simple, and I've been testing it out over the last couple of days. ...
3
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1answer
194 views

Controlling an ESC for Brushless Motors with an RPi

I'm looking to build a new (first) quadcopter without the conventional flight controller and radio, with an onboard RPi and applying some newfound knowledge on autonomous control to improve my coding ...
2
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5answers
567 views

Raspberry Pi quadcopter thrashes at high speeds

I am attempting to build a Raspberry Pi based quadcopter. So far I have succeeded in interfacing with all the hardware, and I have written a PID controller that is fairly stable at low throttle. The ...
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2answers
175 views

I need help with choosing a computer on the board

I need a computer on the board like raspberry pi for vending machine (I want to replace the original controller). This is list of some requirements: 1) It should have pins to connect to the mdb ...
1
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1answer
215 views

Is my quadcopter loop fast enough?

I've been working on a quad copter for awhile now, recently I've finished the interface for PID tuning and its leading me to question several design decisions. The quad uses a RaspberryPi as its ...
1
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2answers
419 views

iRobot Create 2 discrepancy betweenOpen Interface Specifications and Create 2 Serial to 3.3V Logic

I am cautiously moving forward with my new iRobot Create 2, planning on using a Raspberry Pi with ROSberry installed to control the Create 2. Discovered a problem with the pin out specs between the ...
2
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3answers
589 views

Connect to video stream with Java app instead of console and mplayer [closed]

I'm building a quadcopter using Raspberry Pi. There is the Pi Camera connected to the Raspberry Pi which is streaming the captured video. I can connect to this stream via Wi-Fi on my notebook (Linux) ...
1
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2answers
303 views

Nano Quadcopters Microcontroller and battery

I am looking into building a nano quadcopter, But as i watch more resources and videos i get more confused, regarding some of the things that i hope would be answered here. I am in very basic level of ...
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2answers
1k views

Raspberry Pi vs BeagleBone Black Rev C on vending machine

I wish to start my vending business, but none of the existing vending machines fit my needs. So, I need to choose the "brains" to my vending machine under current development. The user experience of ...
1
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0answers
509 views

RNN instead of a PID controller

I am building a drone using the raspberry pi and I am using 6*PID controllers to control the speed and the value for each angle, can I use a recurrent neural network (RNN) or other neural network to ...
6
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1answer
4k views

Build a ROS robot with SLAM without laser

I've build a simple wheeled robot based on two continuous servos, controlled by Raspberry Pi running ROS-groovy, with a smart phone mounted on top to provide additional sensors. I'd like to situate ...
1
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0answers
192 views

Raspberry Pi finer servo control

I'm usig RPI and Servoblaster to control servos. I've set the --step-size to 2 us, but I'd like to decrease it to 1us. I've tried to set the ...
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1answer
95 views

Motor control using arduino/raspberry pi [closed]

I'm new to robotics. I would like to know if 56 output lines can be taken from an arduino or raspberry pi?
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2answers
6k views

it's worth to make a line follower using a raspberry pi and a web cam?

I wonder if this would be a competitive robot compared with one made with a traditional approach using a microcontroller and infrared sensors. I suppose that raspberry can perform an edge detection to ...
4
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4answers
1k views

Which micro-controler/processor to be used for autonomous stereo vision robot system?

I am very new two robotics, however I have a working stereo algorithm which I want to combine with a SLAM algorithm. I am developing this system for an other application but I decided integrating it ...
2
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2answers
184 views

How do I learn about Arduino/raspberry-pi based robotics on my own? [closed]

I am interested in learning how to build a dynamic quadcopter, and hope to be fairly proficient with Arduino/raspberry-pi. What resources and/or practices might you recommend?
3
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1answer
8k views

How to read data from i2c using i2cget?

I'm new to embedded devices and am trying to understand how to use i2cget (or the entire I2C protocol really). I'm using an accelerometer MMA8452, and the datasheet says the Slave Address is 0x1D (if ...
1
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1answer
142 views

Need specifications to operate this stepper motor with RPi or Arduino

Here is the disassembled stepper motor that I'm working with: Contains the photo of the motor, and the label that's on the bottom of the motor. I need to identify this stepper motor that was ...