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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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Read Quadrature encoders over I2C bus

I need to add encoders to the 4 motors attached to a "remote" PCB. The remote PCB in question does not have microcontroller on it, but rather is connected to the microcontroller PCB with an I2C ...
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0answers
21 views

RCWL-0516 Microwave Radar Sensor

I have recently been interacting with these cheap radar modules from China and works fine specifically the RCWL-0516 Microwave Radar Sensor. Now I wanted to integrate the entire circuit into a custom ...
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0answers
31 views

Simple Animatronic - slow repeating/reciprocal motion for a window display

I am trying to rig a contraption to pull a model hot air balloon back and forth along a curved horizontal track. Its motion is both horizontal (6’) and vertical. I have built the track and rigged the ...
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3answers
113 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 ...
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1answer
63 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 ...
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1answer
71 views

Compensate centrifugal force in accelerometer measurements

I'm working on a project that includes counting the revolutions of a cylinder connected to an engine. This engine runs at a minimum of 5 revolution per second and a maximum of 9 revolution per second. ...
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0answers
20 views

How does “Tilt on Wrist Interrupt is detected with one accelerometer axis” work?

bma456 has a tilt-on-wrist detection interrupt. When ever the device is rotated more than a minimum of 12 degrees to gravity, an interrupt interrupt is generated. In the data sheet, it says "The Tilt ...
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1answer
744 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 ...
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5answers
607 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 "...
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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 ...
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1answer
186 views

Connect 240v PIR motion detector to Raspberry Pi

I want to connect a 240V PIR motion detector directly to my Raspberry Pi 3. Inside its plastic case I found 2 PCBs. One is the power supply board which has a 24VDC relay, a S9013 NPN transistor, ...
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1answer
85 views

Is mbed RTOS suitable for commercial motion control solutions

Is the mbed RTOS suitable for commercial motion control applications? Is it advisable to separate the actual motion controller from the network handler, etc (i.e. motion controller in separate MCU)? ...
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3answers
325 views

How can feedforward be used with PID for motion control

In a motion control system where a motor accelerates, coasts, and decelerates (setpoint is position, not velocity!), what would be the benefit of using feedforward with PID, instead of solely PID? ...
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1answer
374 views

presence detection using Panasonic grid eye [closed]

I want to use grid eye AMG8833 for presence detection. Has anyone used gridEye for the same purpose? Or Can someone suggest algorithms to decide whether someone is present beneath the sensor or not ?...
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2answers
91 views

Choosing an Encoder Resolution

What is the minimum resolution recommended for low acceleration motion control? Maximum Velocity can range between 2 rev/sec to 50 rev/sec. Acceleration could be as low as 0.01 rev/sec/sec. ...
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2answers
612 views

i want to use motion sensor module ouput to trigger a triac

i am begginer in electronics and this is my first circuit its about a small motion sensor 220v AC switch i want to make myself but i want to use Triac as a solid state relay insteade of normal relays ...
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1answer
143 views

Main switch circuit with thyristor and bridge problem

Following circuit is a 220V touch switch from this website: http://8085projects.info/m668-based-touch-sensitive-step-dimmer-circuit.html I'm wondering how it works because the IC take its working ...
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1answer
57 views

Change in current for a moving sliding bar? [closed]

From this diagram: This design is inspired by the classical rail configuration, however, now having all the current flow direction in the -y axis. There are two components, a large rigid conductor ...
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0answers
183 views

Long Range Motion Detection solutions

I'm trying to find solutions for the security of an outdoor area (2km long and 1km wide). We want to detect any breach through the borders of the area, if someone sneaks in and/or someone goes out. ...
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1answer
135 views

High resolution rotary encoder

I'm trying to find a way to translate small angle rotation into some form of digital signal. 1 degree resolution would be excellent, but something like 5 degrees would be ok. I need something like a ...
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2answers
436 views

pir motion sensor sensor - working principle

I read about how PIR sensor works. It is written that it has two slots that convert IR energy to electrical voltage pulses. The working principle is to diff between the two slots and when the ...
0
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1answer
249 views

ARM Cortex-R for motion control application [closed]

I need to control about 50-motors(brush DC/Stepper) with each of them having an encoder for feedback.Precise motion control is needed for each motor axis.I have been looking at ARM cortex-M4 ...
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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 ...
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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 ...
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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 ...
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1answer
606 views

how to program BMI160 inertial measuremen unit to latch detection flags

How should BMI160 registers be set to enable detection flags to be set in INT_STATUS? For example, how to get TAP_STATUS byte-0 bit-5 s_tap_int to set if XDK110 is tapped? I don't need actual ...
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1answer
98 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 ...
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1answer
64 views

PIR motion detector or Emitter receiver pair or? [duplicate]

I have a simple 3 ft by 3 ft goal. I want to electronically detect when a ball passes into the goal but not when it goes wide. I had initially thought i could use a simple PIR motion detector ...
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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 ...
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0answers
218 views

Accelerometer - Offset correction

I'm using the MMA8453Q for motion detection. The accelerometer is mounted such a way that when it is stationary, X & Y axes are at 0g & Z-axis is at 1g. My usecase is: A tilt across any axes ...
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1answer
304 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 ...
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0answers
349 views

Relate Pyroelectric Passive Infrared Sensor analog output to the digital “motion detected” signal

I'm using a digital PIR sensors from the picture below. it outputs a high (3.3V) on motion detection, low (0V) when no motion was detected. The analog sensor component of this motion sensor is the <...
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1answer
69 views

MEMS measurements of relative motion [closed]

I haven't performed any tests, but if I am in a train with velocity != 0, what will measure my IMU? (With IMU I suppose to have acc + gyr + magn). I am in a relative motion system, and my MEMS will ...
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1answer
113 views

passive motion sensor

I would like to get a microcontroller out of sleep when the board starts moving (or vibrating). If possible it should just be a passive switch (I only need a positive edge from a battery to get the ...
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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 ...
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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 ...
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1answer
172 views

How to detect end of avaliable movement of mechanism connected to a stepper motor, without external detectors?

I have access to (not quite working) 3D printer. It has no endstops, no switches that would detect extreme positions of head or table. I know this because I was there when it was assembled. All cables ...
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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 ...
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2answers
250 views

Complicated photo-motion-timer switch design?

Here's my scenario: I have an array of 120V LED fixtures that need to be turned on for 10 minutes when the following conditions occur: It's dark out AND Someone walks in front of a motion sensor OR ...
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3answers
123 views

Sense human behind plastic?

We need to get some kind of a simple sensor, that can sense someone is standing close to a product . But, it has to be behind plastic, and not seen at all . We only need to detect someone 1 meter ...
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0answers
194 views

Is “transient detection” exclusive to Freescale?

I'd like to detect the dynamic component of acceleration, i.e. the change in acceleration, and generate an interrupt when such change is detected. I see that MMA8451/2/3 calls this "Transient ...
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1answer
245 views

Accelerometers and transient acceleration

I'm trying to understand the notion of transient acceleration threshold. I'm working with the popular MMA8452 and the way I understand transient acceleration is that it represents the dynamic ...
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3answers
1k views

Detecting a moderately-fast moving object from 1ft away

I have a small side project using Arduino (pro mini or nano) that would detect passing model race cars (and quadcopters) and counting how many times it passed through a selected location. I thought of ...
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2answers
5k 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 ...
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4answers
341 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
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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 ...
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1answer
159 views

adam module sensing AC motion detector [closed]

I have been trying to setup a custom security system for my house. I am using Milestone's XProtect system with multiple cameras and one Adam 6050 module. I use the Adam 6050 module for magnetic door ...
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2answers
176 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 ...
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1answer
118 views

How are microcontrollers designed? [closed]

I've always wondered the steps involved in designing a microcontroller. Let's say one wanted to design a dedicated motion control chip, would this be "hard wired" into the chip? What kind of software ...
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2answers
866 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 ...