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20 views

Lockup while evaluating Wire.requestFrom function (Arduino) [migrated]

I am currently working on a Arduino project that combines an InertiaOne IMU sensor board (from Atmel), with an Arduino UNO and two motors driven by a Makeblock driver board. All sensors communicate ...
4
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2answers
417 views

Robot following you; what's the best way?

I built a human-sized robot that can follow anyone wearing an IR beacon. It works quite well indoors and it's quite precise, but outdoors it is completely blind due to sunlight infrared. I have a ...
0
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1answer
82 views

Trying to figure out how to solar power an embedded device

I have an Arndale octa board which itself needs 5V 3A power supply. Then I have four (4x) DC 5V motors and a 5V servo, and a number of other peripheals. So I think 5V 5A is safe to assume? I want ...
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0answers
21 views

Video guidance system for 3pi robot to PC

I am currently working on a graduate project. It aims to build the guidance video system from 3pi robot. The video input would determine the types of action that the robot needs to executed. I'd like ...
0
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1answer
39 views

Vex 393 motor with 12V supply

Have a Vex 393 2-wire motor and I'm using a 6-40V PWM driver @ 5A max. My question is this... The Vex was spec'd at 4.8A stall current and 0.37A no-load current at 7.2V. From what I've read here ...
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1answer
87 views

Servo doesn't move when driven by a PIC micro controller [duplicate]

I have a PIC12F629 and a servo sg5010(for which I could not found any datasheet ) So I built this circuit : simulate this circuit – Schematic created using CircuitLab The LED is for ...
2
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3answers
153 views

How to make two motors spin at the same speed?

I am currently using two identical motors to drive a robot. The motors are both controlled using relays but one of the motors is spinning faster than the other. How can I slow down the faster motor ...
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1answer
44 views

Is it possible to use 2 relays instead of a DC motor controller?

I have been for motor controllers to control two 12V motors that have a stall current of 130A and at max power (expected operation) will draw 68A. I am having trouble finding low cost motor ...
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3answers
152 views

Is It Safe To Apply 24V Across a 12V Motor?

I am trying to determine if it is safe to apply 24V across a 12V rated motor. I am working on a robot that weighs approximately 150lb and has a friction intensive drive system. I believe the motors ...
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0answers
23 views

What is JTAG TCE signal designed for and what effect does it have on the boundary scannable IC?

I know for fact that some boundary scannable ICs don't have this JTAG TCE input signal but some does. Does any one know why?
0
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1answer
52 views

ARM microcontrollers for robotics [closed]

I have been working on ARM9 microcontroller LPC3141 until recently, but I am wondering if there are any better and newer ARM microcontrollers more suitable for robotics. ADD: Are there any general ...
3
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2answers
274 views

GPS positioning for quadcopter

I am an engineering undergraduate student. I am currently working on a project to implement a sensing package on a quadcopter for the deployment in the canopy of tropical rain forests. This package ...
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1answer
75 views

Identifying this “Transistor”, in this particular circuit [closed]

I'm in FIRST robotics, and I've been helping with our robot over the past few weeks. Every robot (in FIRST) is required to have a status light, which is fancy-ily connected to some other gear. ...
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0answers
91 views

PD control (PID without I) - Homework help

I've been given a system - x" = bx′ + kx + ru and I've been asked to rewrite it in the canonical form x' = AX + BU. I've got -- ...
0
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3answers
286 views

Serial connection between Raspberry Pi and Roomba

I have a Raspberry Pi with this FTDI cable and a Roomba 560. The Roomba has an SCI port to allow for control of the roomba via serial. I installed the PySerial library on the pi and send valid ...
0
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2answers
65 views

Using srf05 ultrasonic sensor to detect changes only

I am using the SRF05 sensor to detect distance, so far so good. Now we need to detect only changes, which means, the sensor will have some close object to it, but ...
1
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3answers
365 views

How to drop 6 volts to 5 volts

I am designing a robot using the PIC16F877A microcontroller that will avoid walls and obstacles. I plan to have it run off of 4 AA batteries. I was wondering how i would convert the 6 volt input ...
1
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1answer
187 views

How to get input voltage of 5 and 6 volts

I have an interesting problem in building something with robotics. I am using a PIC16F877A micro-controller to control the robot. The motors of the robot require 6 volts and the PIC requires 5 ...
1
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1answer
251 views

Using a FTDI to USB adapter with a raspberry pi and a roomba [closed]

I'd like to control a Roomba 560 using its 8-pin mini din SCI port. I've seen other people do this successfully but I'm still unclear on how exactly to go about this. I was planning on using an USB to ...
0
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2answers
352 views

How can we use a usb(in a laptop) for general purpose input/output operations, such as robotics control [closed]

How can we use a usb port (in a laptop) for general purpose input/output operations, such as robotics control?? I want to control an external hardware such as a robot or say simply an array of LEDs ...
2
votes
1answer
100 views

What does this Op Amp circuit do in this circuit for a line following robot?

I have seen a schematic for a line following robot, but there is something that I can't understand and is shown in the figure below, what is the purpose of the Op Amp circuit? I know that BREAK input ...
-1
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1answer
784 views

How do IR sensors detect color? [closed]

I'm trying to make a line following robot using Arduino. I have searched the Internet for information on how to build it, but a few questions remain: How does an IR sensor detect colors? What ...
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1answer
68 views

Gear ratio reading [closed]

I've ordered a little cheap kit of gears from Tamiya with multiple possibility os gear boxes to test. But I'm wondering how to read the value of the ratio as I'm not sure I've understand it quite ...
0
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1answer
155 views

Arduino multiple serial module usage

I'm stuck at this seemingly simple thing. I have a NMEA GPS module. It doesn't matter how it operates, it just transmit serial data stream at a baud rate of 38400. I have an arduino Mega which has ...
0
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2answers
87 views

Behavior Based Robotic

I was reading this book which talks about behavior base robotics. Since it uses IC for programming at some point it uses a function called startprocess(). After looking through the web I could not ...
0
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1answer
338 views

Using Arduino, how can I dynamically change signal input from one pin to another?

Background I am building a multirotor project similar to this one I built a few months ago. This particular multirotor will be geared for flying FPV (First Person View) which means that I will ...
1
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3answers
166 views

Iphone wireless communication without Wifi? [closed]

I am working on a robot that I would like to control using an Iphone app that I am creating. The problem I'm facing is that the robot will be operating in areas where there will most likely be no ...
2
votes
1answer
315 views

How to make a circuit to run DFRobot with a Netduino

So I ordered a DF Robot kit and got some help to put it together. I want to control the wheels with my netduino. What I want to do is simple. Press the netduino's button, and start the 4 wheels in ...
3
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1answer
267 views

Waterproof sonar?

I'm building sensors for an underwater robot and was wondering if it's possible to waterproof ultrasonic range finders like this one to work underwater. I have made waterproof enclosures before. ...
-1
votes
3answers
603 views

Controlling Microcontroller using Visual C# [closed]

I'm building an ROV which I will program normally with C but I want to control the microcontroller from a PC using a program written in C#. So for the ROV, the microcontroller will be controlling it ...
3
votes
1answer
252 views

Replacing a Wired Controller with an Arduino Uno: Relay Alternative

So, I have a simple robotic arm that has a wire controller you plugin into it. The controller has 8 pins. I haven't played with it too much but I know that the far ends are power sources and the ...
1
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0answers
330 views

Raspberry Pi vs Arduino ADK (with phone tethering)

I was doing some research for my capstone project next year. Basically it is an autonomous rover, designed to scout out outdoor areas and send back video/pictures to a website. So far, our initial ...
2
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1answer
166 views

Winch or regular servo

I am trying to build a robotic arm and for the base I need a servo with a lot of torque. After browsing through hobbyking's servo selections I noticed that winch servos offer a higher torque for ...
6
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1answer
153 views

Powering sub-sytems on a robot with a single battery

I am making a robot for a project, and have a quick question about the power system for my robot. I have to power an AVR MCU (5V), 6 servos (also 5V), 4 dc motors (12V), and a camera (9V). I really ...
0
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2answers
280 views

PIC18 Robot - Travelling exact distance straight using two wheel encoders problems

(EDIT: Added TMR0 & TMR1 set-up code) I have a small robot vehicle controlled by a PIC18f4585. It has two wheels (ball bearing on the front) as well as two rotary encoders. The following ...
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votes
3answers
242 views

Information delivery through zigbee

I am doing a project in which i have to measure the voltages of a given terminal and send it to other distant system through zigbee. My work plan is like this: I will use an arduino board and measure ...
15
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8answers
1k views

Microcontroller/cpu for fast trigonometry in robot?

This concerns hardware that does weighs little, because a (fat cat sized, 6 legs with 3 DOF) walking robot should carry it around. Because of that walking it'll need to do a lot of trigonometry (using ...
4
votes
3answers
296 views

Communicating via USART with an AVR - Input Buffer?

I am currently building a robot (as some of you may know from my previous questions). The current task I a dealing with is that of communication. To keep things simple, assume I have 5 commands to ...
2
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2answers
132 views

Wireless communication with robot

I am making a simple robot, and am using a relatively cheap RF transmitter and receiver to send commands to my robot. Essentially, the transmitter end would send data from an AVR MCU via its UART to ...
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votes
1answer
105 views

TI ARM with stacked RAM

Do any of the TI ARM SOCs, e.g. OMAP or Da Vinci, have a version with stacked RAM? (e.g. DDR2 or mDDR) For miniature robots, it would be really nice to not need to spend board area on an external RAM ...
-2
votes
1answer
322 views

How can an experieced programmer get into embedded programming and robotics [duplicate]

Possible Duplicate: How to become an embedded software developer? I would like to know what is the best method to begin learning embedded programming and electronic skills? I am already ...
2
votes
1answer
928 views

Selecting a GPS module for a mobile robot [closed]

I need a GPS module to include in my quad-copter for providing GPS based navigation. I found there are many GPS modules available, and there are different kind of information available in their specs. ...
5
votes
2answers
113 views

Inspection/QA Criteria for Selling Electronics?

I'm a software developer who has recently taken up a penchant for home electronics and personal robotics. I'd like to start building a prototype for a small device that I would sell though a website, ...
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votes
1answer
503 views

Speaking words with Pololu 3pi Robot [closed]

At each instersection I play different music for the compass direction the robot decided to go. Any ideas how to get the robot to speak the words "West", "East", "South", "North"? ...
2
votes
1answer
1k views

How to calculate the range of a RC transmitter

When searching for a transmitter for a RC application in most of the cases they don't provide anything about the range of the module. Just power and the frequency. The Tx power must relate to the ...
0
votes
1answer
745 views

Test ESC using a Servo Tester

I'm trying to test my 20A Hobbywing skywalker ESC. For that I bought this servo tester from ebay I'm a bit confused about the servo tester input. Shouldn't it be just supply power? Then what is ...
3
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2answers
555 views

Electronically controlled pneumatic lift, or something similar

Need to be able to firmly lift about 110Lbs (~50Kgs) weight, through a distance of upto 12 inches. The weight can be considered to be a flat & square wooden board, hinged to a flat platform, with ...
0
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3answers
202 views

robots communicating with each other [closed]

Is there any possible way of designing robots that can communicate with each other? As in, one of the robot can be programmed to act as a master, while the other robot, situated somewhere else, can be ...
1
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2answers
1k views

How do I calculate how long my robot's battery will last?

I am building a robot with multiple types of sensors, 2 motors for locomotion, and 2 motors to control a robotic arm. I am using a variety of color, IR, tilt sensors and such. How would I factor in ...
4
votes
1answer
1k views

How to use an ESC

I'm new to RC related modules. Today I got my Hobbywing's Skywalker 20A brushless esc. Manual is here. I also have a brushless outrunner motor (HL3512) I ...