Questions tagged [motion]

Motion may refer to the motion of objects, like rotation, drop or picking up, for which **motion sensors** are used. Or it may refer to the motion of persons, for which typically **PIR motion detectors** are used.

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61
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6answers
10k views

What makes smartphones tilt-sensitive? Will they retain this ability in zero-gravity conditions?

Most smartphones are tilt-sensitive, but what device makes this possible? Additionally, how does it (and the sensors associated with it) work? Also, since the working of these sensors seem, almost ...
12
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3answers
15k views

Can I electronically trigger a PIR motion sensor?

I would like to trigger a PIR sensor using an infrared LED. Is that possible? My goal is to simulate motion in front of the PIR, when there otherwise is none. I tried using a handheld remote ...
10
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2answers
2k views

Which sensor to use for detecting nylon string vibration?

I need to detect motion on a nylon (transparent) stringed instrument. When the string is plucked, it would vibrate and I'd like to know what kind of sensor to use in order to detect the action. ...
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9answers
5k views

What sensor should I use to determine if my project is moving?

I don't care how much it's moving, how fast or in what direction, I just want my Arduino-based project to know if it is moving or not (so I can shut off high-current drain LEDs when my bike is ...
8
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8answers
1k views

Looking for small motion sensor

Are there other options for a small (< 5mm long) low-g motion sensor than accelerometers? I don't need to measure the acceleration picking up my device causes, I just want a 1/0 signal when it ...
6
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3answers
12k views

Car security solution - designing the right motion detector

My car gets broken into quite frequently. The car is right outside of our bedroom window. The break ins happen at night, and we never hear them! They must be very sneaky. I would like to design (or ...
6
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4answers
1k views

low voltage motion sensor

I am looking for a motion sensor device that can track person/animal walking by it and record time/date of the event(s). It needs to be able to run on a small battery or two (maybe 2 AA's or a 9 volt)...
6
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3answers
10k views

Sample Application with LHI 778 PIR Sensor

For a motion detecting application I found a sensor with code LHI 778. If you look at the datasheet in the link, the characteristics of its internal FET transistor is not specified and there is no ...
6
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5answers
799 views

Stepper Motor acceleration profiles for short runs

I've done a fair bit of reading on stepper motors and acceleration. I had to wade through a lot of different strategies with a lot of calculations, including one which called for several candles, and "...
5
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1answer
751 views

Identify this component with a weight inside a cylinder

This component was pulled from a device that was used to detect movement. When I first saw this part, I thought it was an electrolytic capacitor, but upon closer inspection, I found that if I shake ...
5
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3answers
7k views

Best way of making a trip-wire type device?

I'm wanting to make a type of electronic "trip wire". My basic idea is to have like a laser and basically when the laser is interrupted then it sends some signal to a microprocessor. I'm not tied ...
5
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3answers
2k views

Generating electricity by moving a door

I'm entirely new to electrical engineering. This is for a hardware/software project I have in mind, where I need electricity without having to plug the device into a power source. My intention is to ...
4
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2answers
9k views

12v LED Strip Lights controlled by PIR *Want to add LDR to project*

I want to add an LDR (Light Dependent Resistor) to my Motion activated stair lights, then On/Off switch can be removed as well as the single Led (On Indicator Only) from my project (I want the LDR to ...
4
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2answers
2k 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 ...
4
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1answer
905 views

Optical linear encoder for motion tracking?

I need to find a cheap optical solution to measure the position of an object in relation to a surface. The object glides in a linear motion along an axis, around 30mm away from the surface. The ...
3
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5answers
5k views

Conveyor belt speed monitoring

I am new to all this so forgive the dumb rating. I need to monitor the speed of a few conveyor belts, the belts are around 10ft to 50ft long and 3ft wide and has anything from heavy boxes to thin ...
3
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3answers
1k views

What motion sensor to use for human breathing [closed]

I need a cost sensitive, reliable, durable motion sensor to track if a baby is breathing or not. This is for use in a university challenge project I hope to win. Any advice on my options are very ...
3
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2answers
1k views

What is this component (probably a shock/vibration sensor)?

The other day I received a promotional wrist band from a convention booth -- it has two LEDs that flash when you jostle it. I removed the guts to see how it works, and here is what I found: Most of ...
3
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2answers
186 views

Need help modifying a motion detector circuit

I'm working with my son on a 4-H project, and we have great ambitions, but very limited knowledge. We're looking to use a motion detector to switch off the current to electromagnets that will hold ...
3
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2answers
4k views

Faster PIR Sensor speeds?

I am trying to use an array of sensors to trigger a series of stepper motors based on peoples' presence within different areas of a hallway. It is for an interactive kinetic art piece at an elementary ...
3
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1answer
439 views

Robotics Experts: How to do trajectory planning for a robotic arm

I have a homemade 3D printed prosthetic robotic arm similar to the picture below Right now this is completely open loop control system. The elbow, wrist and base can only rotate in around its primary ...
3
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2answers
2k views

What type of LED lights are needed for detecting retro-reflective markers for motion capture project?

I've a project in which I want to add 10-12 led lights around webcam's lens so that the camera can detect retro-reflective tape in it's viewing area. How this process works is something like this. I'...
2
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2answers
6k views

A motion sensor that can be covered?

We are seeking after a motion sensor, probably PIR , that can be covered with regular plastic or ABS ( that means you will have a regular product enclosure where the sensor is inside it ) . I could ...
2
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4answers
7k views

How to count the number of people in a room with a specific sensor? [closed]

I want to count the number of people in a small room. According to my research, there are person-counters in the web but I want to use the number of people data for coding hence I must transfer the ...
2
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5answers
123 views

Suggestion for a lack of light warning unit when in motion

I would like to build a small device that warns me, with sound and or a 'dash' lamp, that my headlight is off if the motorbike is moving. My challenge is it is under warranty, so I cannot in any way ...
2
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2answers
770 views

Creating a large motion sensing plane

I want to try and create a "motion sensing plane" where users can have contact points (their hands) detected when it passes through an invisible plane. Think of it like a giant tablet touch screen, ...
2
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2answers
3k views

DIY linear servo mechanism?

This might belong on the new Makers site, but it could be applicable here too. I'd like to position a device on a 1 meter linear shaft to within 50 microns. I can currently, with steppers, get down ...
2
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1answer
317 views

How to choose laser galvanometers

I am currently looking to purchase laser galvanometers like this and this. However, as I'm not familiar with lasers, I'm not sure the criteria I should use to evaluate whether a given product is a ...
2
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2answers
460 views

GPIO Input fluctuating between high and low when no input is received

I posted this on the Raspberry Pi StackExchange but I feel as though it might be better suited for here, as the SE is pretty inactive anyway. I've got a fairly simple circuit that I've made where a ...
2
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4answers
1k views

Position tracking system for frisbee

I'm trying to build a smart frisbee for use in Ultimate. I'd like to be able to track the position of the frisbee in a playing field with pretty good accuracy (within ~2ft). GPS is a possibility, but ...
2
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2answers
3k views

Sensor options to detect ball

I am working on what I hope is a simple project as I am dabbling in this field. I am trying to create a target (in the shape of a box) roughly 1m by 0.5 meters into which soccer balls will be shot (...
2
votes
1answer
1k views

Development with InvenSense MPU-6000/6050 - where to begin?

I'd like to use a MPU-6000 chip for an AR app on an Android device. However I have no clue where to begin, which parts I need or whatsoever. I'm familiar a bit with Arduino, but only as a newbie. ...
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2answers
2k views

Problems while using accelerometer as a motion switch

I am using an accelerometer ADXL206 and a microcontroller PIC16F917 to determine the relative linear motion of a device that functions according to this motion. I can read data from the accelerometer:...
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2answers
2k views

PIR sensor not triggering P2N2222

I have this setup where a PIR sensor (HC-SR501) powers an LED strip with the help of a P2N2222 transistor. I then manually connected the Transistor base to the 12v rail and it has no problem ...
1
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3answers
117 views

Is there any way to obtain linear or angular distance proportional to a voltage signal?

If we have a programmable arbitrary function generator as a voltage signal source and if we are able to output any waveform like a sine or exponential decay as output voltage versus time; how can this ...
1
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1answer
454 views

motion detected protocol

Is there a standard protocol for motion sensors, PIR sensors, etc. to tell parking lot lights, etc. that motion has been detected, so the lights need to turn on? I'm not asking for protocols that ...
1
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2answers
3k views

PIR sensor led strip with N channel mosftet

I have a PIR sensor (HC-SR501) and I want it to turn an led strip(12V 0.8A) on when the sensor detects motion and off when there's no motion. I checked a previous thread which is similar in that ...
1
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1answer
64 views

Calling a routine every x miliseconds

I'm working on a motion controller using the mbed platform. The idea is to calculate the theoretical position in the move every x milliseconds and then compare it to the actual position from the ...
1
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1answer
70 views

To Fail-Safe or not Fail-Safe on RS485/422 Transceiver

I'm stuck on a PCB design issue. I'm designing a new PCB (Daughter board) that will plug (via DB15-F to DB15-M) onto another PCB (existing Mother board) and the design intent is to take (from the ...
1
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2answers
7k views

Pinout of microwave motion sensor FC1816

Please, help to figure out the pinout of microwave motion sensor FC1816. The seller "doesn't understand" what it is required on queries to provide the pinout for the module. The module is the ...
1
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2answers
876 views

Simple Phototransistor Motion Detector

I am trying to make a simple motion detector for objects within a few feet in a very small footprint with minimal parts. I don't need to know much info about the motion just simply if there was motion ...
1
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2answers
1k views

motion sensor with high pitch noise?

Don't know exactly where I should post this but I'm pretty sure it would be fine here . I was walking home right now late a t night and I walked by this persons house and out of no where I heard a ...
1
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1answer
102 views

Fast, long linear motion (about 60 cm/ 23 inches) [closed]

I'm currently researching a way to build a punch imitation (for boxing training) and for this i need a simple, fast (if it can be configurable great) and long linear motion which can handle a ...
1
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1answer
316 views

Accelerometer - Tilt Detection

I'm using the MMA8453Q for tilt detection of 45 degree in any axis. I'm a newbie to embedded devices. I have a few questions. 1) Should I be using Transient detection or Motion detection for my use ...
1
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1answer
1k views

MPU 6050 Digital Motion Processor Gyro Units

I'm running into an odd issue with a motion control processor (MPU 6050 / 9150) that is returning raw gyroscope values as specified between the -/+ 32768 which in the way this gyro is configured ...
1
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2answers
397 views

Recording motion/movement sequence efficiently & accurately

We have a motion platform (camera - pan & tilt) that is controlled by a user using a joystick (so the demand inputs are pan & tilt velocities). The platform itself uses stepper motors, so we ...
1
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4answers
484 views

Low-cost long-range movement detection

I have to design a circuit for a device to detect any motion in front of the device up to 2 meters. I have tried with IR reflection sensor, but couldn't achieve the range. Then, I found a circuit on ...
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2answers
136 views

Most energy efficient way to detect motion

I am hacking together a prototype wrist band, with BLE as the main component. I'd like the device to detect a bump or a wave. What would be the most energy efficient way to do so? I'd like the ...
1
vote
1answer
619 views

Picking the right sensor for a military style alarm

as a "squad engineer" of our airsoft team, I have been asked to create a device that will help us with our "capture the hill" tournaments. As I mostly work with software, I have an hard time picking ...
1
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2answers
947 views

Linear motion - 50mm / 15 N

I need your help or advice. I need somehow to make a linear motion with stroke of 50 mm and starting force about 10N, the holding force after pull (stroke of 50mm) should be at least 20N. The holding ...