PIR motion sensor connected to Arduino sometimes does not detect a repeatable...
I have connected the PIR motion sensor HC-SR501 to an Arduino Uno and its jumper settings is set to H and GND. (This is not a physical jumper, but a small link that connects both H and GND.)It detects...
View ArticleAdvice on setting up sensor switch
Hi I would like to fit a (motion sensor/IR sensor) sensor switch to a machine in my catering van. The machine is a 12v machine.I would like to start the machine using the sensor switch and would like...
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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 thread...
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Triggering 12v Relay with HC-SR501 PIR sensor
I have a SRD-12VDC-SL-C relay with this configuration:https://robu.in/product/1-roadchannel-relay-module-light-coupling-12v/And I want to trigger it with PIR Motion Sensor Detector Module...
View ArticleBetter displacement finder? Lasers/Inertial Sensors
I've seen laser rpm measurement devices. But can it be used the find displacement/distance moved for object when attached to it?I know taking rpm of wheel and multiplying by circumference would give...
View ArticleCan 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 control,...
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What makes smartphones tilt-sensitive? Will they retain this ability in...
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...
View ArticlePartial Differential Equations to Describe Electric Current
I am a newbie in PDE. I know that Navier-Stokes equations are used to describe the motion of viscous fluid substances, what are the equivalent partial differential equations that are used to describe...
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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.A...
View ArticleSense 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 away...
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Changing regular momentary switch to a motion detector in staircase timer...
(Reference image below)I have a classic staircase timer circuit ("TC") where any of the momentary switches will trigger the timer to power all the bulbs. Now I want to replace one of the "T" switches...
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SR501 PIR Motion sensor outputs high voltage in signal pin
I have connected a SR501 is powered by 5v converted from 12v through 7805 voltage regulator. The output voltage on the signal pin is normally 5v and on high it outputs 8v. This makes my relay module to...
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Motion sensor to detect birds and small animals but ignore humans
I would like to develop a motion activated sprinkler to deter birds (cranes and other smaller birds) and small animals from eating the fish in my pond. I am using the approach of controlling a solenoid...
View ArticleClosed Loop Stepper Motor/Driver
I have been tasked with building a motion control demo box. The controller MUST include an Omron Delta Tau Power PMAC (CK3W-AX1515P).I can be flexible with the other components (motors, drivers, etc.)...
View ArticleA few questions on PIRs and other motion detectors
I grew up incorrectly believing that motion detectors (as part of burglar alarm systems) were designed to detect movement, when in actual fact it is the movement of a heated (like body heat) object...
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Motion triggered battery powered dimmable COB LED light
My view on life, in any field, is not to produce more but to consume less. Everybody told me this is a very eccentric weird mentality. Perhaps they are right. Nevertheless I have to build my project to...
View ArticleUnderstanding use of accelerometers to measure angular (rotational?)...
Imagine this: A rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to 90 degrees back-and-forth (in the xy plane), so does the rod. My goal is to measure the instantaneous...
View ArticleHow to add more lights and sirens to motion detector
I have a motion detector size of a cigarette box that rings bell or simple song when activated using a small remote control. We turn it on after closing the business to go home. We've had many window...
View ArticleSensor 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...
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Very low-power ESP8266-based motion detector
I'm building a new schematic to set up an ESP8266 m-based motion detector which should only work during the night.My goals are:Use an RTC to store time and read time when ESP starts up (if not in time...
View ArticleIs it possible to detect linear motion of a billiard cue using a crude...
I’m working on a project that simulates the motion of a billiard cue. I’m thinking of using an Arduino Uno for communication and an MPU6050 module for detecting angular rotation.For detecting linear...
View Articlemotion 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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How can I limit the active working angle on a microwave motion sensor?
I have a microwave motion sensor that can be triggered in almost every angle.I want to limit its angle of view to only one side of the board but so far I had no success.What I have done:Designed my...
View ArticleHigh 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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How can I sense Infrared Light properly to detect direction of Motion
I've designed the schematic below:Basically, I want to detect direction of motion at a door frame from the top to turn on or off a relay which is probably connected to lights. The phototransistors will...
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HB100 range extension with dish antenna
I have interfaced an HB100 sensor with an ATMega microcontroller. It easily detects my hand movement upto 5-6" away only.I want to extend the range of the sensor so that it detects movement upto at...
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Connecting a 240 V PIR motion detector to a Raspberry Pi
I want to connect a 240 V PIR motion detector directly to my Raspberry Pi 3.Inside its plastic case I found two PCBs. One is the power supply board which has a 24 VDC relay, an S9013 NPN transistor,...
View ArticleIs Modbus suitable for motion control positioning?
I need to issue position setpoint commands to a servo drive 50 times/sec. The drive will be responsible for closing the PID loop, etc, while the motion controller I'm developing will handle generating...
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Motion controller using brushed DC motors
I've designed a simple robot with 2 active wheels and 4 omni wheels and I'm trying to figure out the motion controls.I'm using 8300 RPM motors (https://uk.rs-online.com/web/p/dc-motors/3213192) which...
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How to introduce a PIR motion sensor and/or timer into my circuit?
I created a product demo box that completes a circuit once the "push to start" button is pressed. Closing the circuit allows the customer to see my product in action while holding down a button. I want...
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