What motion sensor to choose

[camylia]

Hello everyone !
I am worknig on a project where I want to use a motion sensor to detect hand mouvements : Everytime a person takes a piece from an open-front bin, I should get that information to be sent later to an app.

I'll begrateful if someone could help me to choose the right sensor. I thought of using PIR sensor but it doesn't give the output Iwant since its angle of detection is large and tolerates any hand movement.

Any suggestions please ?

 

[bidrohini]

If the common PIR, does not fulfill your requirement, I think you can consider SONAR sensor instead.

Introduction to HC-SR04 (Ultrasonic Sensor) - The Engineering Projects

A brief read on the Introduction to Ultrasonic Sensor HC-SR04. It is a sensor based on transmitter and receiver where former is used to send the waves...

www.theengineeringprojects.com

But HCSR04 will not detect movement. That will detect your presence in front of the bin. If you are looking for precise hand movement detection, I think you have to consider Raspberry and RPI cam-based machine learning models.

 

[Delta Prime]

Welcome to Maker Pro
First one I googled,evaluation of the circuit. simple effective. you can apply to trigger a counter if you would like. To see how many times one's hand dipped into the bin. The components themselves do not have to be exact the resistors transistors LED or detector it's general purpose.
Could you please elaborate on the app itself.

 

[camylia]

Welcome to Maker Pro
First one I googled,evaluation of the circuit. simple effective. you can apply to trigger a counter if you would like. To see how many times one's hand dipped into the bin. The components themselves do not have to be exact the resistors transistors LED or detector it's general purpose.
Could you please elaborate on the app itself.
View attachment 59245

What is the purpose?

 

[Delta Prime]

What is the purpose?

project where I want to use a motion sensor to detect hand mouvements : Everytime a person takes a piece from an open-front bin, I should get that information to be sent later to an app

It's a possible option to your request it will fulfill your requirements to the point it reaches the app I need to know what type of app but if you're more comfortable with modules to interface that could be done as well

 

[camylia]

It's a possible option to your request it will fulfill your requirements to the point it reaches the app I need to know what type of app but if you're more comfortable with modules to interface that could be done as well

I'm stuck at data acquisition first. I need to know what type of sensors could do the job.

 

[Delta Prime]

An LED and a photo transistor will acquire the data you seek. This is only one of many sensors available to you. Allow me to elaborate.
When your hand reaches into the open bin the infrared radiation or light emitted from the LED
will be reflected from your hand to the
Photo transistor detector, a voltage will be developed on the output of the circuit and could be interfaced to your application or app. The application itself will store that information. The the Information being how many times anyone puts their hand in the open bin. The sensitivity of the circuit can be adjusted so that only a hand entering the bin will trigger your application.

 

[Delta Prime]

I thought of using PIR sensor but it doesn't give the output Iwant since its angle of detection is large and tolerates any hand movement

It will solve your probelm.

 

[Delta Prime]

Darn it! I think I scared her away!

 

[Bluejets]

I thought of using PIR sensor but it doesn't give the output Iwant since its angle of detection is large and tolerates any hand movement.

Direct the IR sense through a tube of appropriate size to cut down the angle,........... simple.

There is an Arduino Passive infra red module that might suit, around 16mm diameter I think.
One could also use the Arduino to then give data to your app.

Run of the mill IR tx rx signal would need to be modulated to avoid interference from sunlight etc.

https://www.aliexpress.com/item/1005005224080345.html

Plenty of info on how to use either on the net.

 

[camylia]

Darn it! I think I scared her away!

Haha ! Kind of. I'm not that good at electronics. I understand what you've explained. I don't know what could be an effective solution.
I thought first of a PIR sensor, but if I just wave my hand, regardless it's in the bin or not, that sensor gets triggered.
The other sensor I thought of is those sensors we use in washroom taps, but again I have no idea what type of sensor is. That's it !

 

[camylia]

Direct the IR sense through a tube of appropriate size to cut down the angle,........... simple.

There is an Arduino Passive infra red module that might suit, around 16mm diameter I think.
One could also use the Arduino to then give data to your app.

Run of the mill IR tx rx signal would need to be modulated to avoid interference from sunlight etc.

https://www.aliexpress.com/item/1005005224080345.html

Plenty of info on how to use either on the net.

Ah I see. I got it. Thank you.
If I want to use this sensor I will need to cut down the angle.

 

[Bluejets]

Ah I see. I got it. Thank you.
If I want to use this sensor I will need to cut down the angle.

Note that there are 2 sensor types mentioned in my reply.

One is a passive unit which detects movement by the change in natural heat energy, available as an Arduino "module".

The other is a Tx and Rx unit which generates it's own signal butmust be modulated to avoid interference from sunlight or house lighting etc.
Latter also available as a basic Tx/Rx unit in Arduino module form.

 

[camylia]

Thank you so much =)