Build a Device: Help Guide from PF Geeks | RinGGiE*RasTa

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Discussion Overview

The discussion revolves around the design and construction of a device intended to notify users through an LED when they enter a specific area. The device consists of two components: one fixed to a wall and the other worn by the user, similar to a wristwatch. The participants explore various technologies and methods to achieve a reliable communication range of approximately 100 meters.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • RinGGiE*RasTa outlines the basic functionality of the device and expresses a need for guidance on building it, mentioning potential technologies like transmitter/receiver devices or RFID.
  • Some participants suggest that achieving a 100m range may require using licensed RF bands, with the ISM band being a possible option, but note that the antenna size may not be suitable for a wristwatch.
  • One participant proposes using a PIR motion detector, which typically has a limited range of about 20 meters, as an alternative to achieve the desired functionality.
  • Another participant suggests using multiple sensors around the perimeter, such as light beam break detectors, and questions the practicality of a wristwatch design.
  • A later reply introduces the idea of using an induction loop system as a potential solution.
  • Another participant mentions the possibility of adapting technology from 'invisible fences' used for pets as a model for the device.

Areas of Agreement / Disagreement

Participants express differing opinions on the feasibility of various technologies for achieving the desired range and functionality. There is no consensus on the best approach, and multiple competing views remain regarding the design and technology options.

Contextual Notes

Some limitations are noted, such as the dependence on specific technologies for range and functionality, as well as the unresolved question of how to effectively integrate the device into a wristwatch format.

RinGGiE_RasTa
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Hello geeks of PF! Wooooo!

I am in need of some help that will allow me to build a device.

Roughly this is how I want my device to work -

This device will help notify users about anything that I would like to notify them by indicating it through an LED. The device has got 2 ends; one end is attached to let's say a wall and the other is on the user like a wrist watch. Whenever the user enters an area (of let's say 100m) that has the first end installed then the end on the user will receive a signal and the LED will light up.

Now please help me out here people.Websites have very bleak guidelines that can help me move ahead with my very first build. I am on the edge of destruction I have tried various means but to no avail. I have narrowed down to either using a transmitter/ receiver device or a radio-frequency identification device. If anyone of you has a better idea then please do let me know. PLEASE HELP ME BUILD THIS DEVICE THANKS =D

It does not matter what signal I use or how I transmit the signal. What matters most is that the end product should have a feasible transmitting/receiving range of let's say 100m, consist of minimal number of interferences from other devices, portable and user-friendly. If we can get to this stage then later on maybe we have further improvise and innovate the product to a better finish.

Attached is a brief sketch of how my device should work.

Thanks mates,
RinGGiE*RasTa
 

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RinGGiE_RasTa said:
Hello geeks of PF! Wooooo!

I am in need of some help that will allow me to build a device.

Roughly this is how I want my device to work -

This device will help notify users about anything that I would like to notify them by indicating it through an LED. The device has got 2 ends; one end is attached to let's say a wall and the other is on the user like a wrist watch. Whenever the user enters an area (of let's say 100m) that has the first end installed then the end on the user will receive a signal and the LED will light up.

Now please help me out here people.Websites have very bleak guidelines that can help me move ahead with my very first build. I am on the edge of destruction I have tried various means but to no avail. I have narrowed down to either using a transmitter/ receiver device or a radio-frequency identification device. If anyone of you has a better idea then please do let me know. PLEASE HELP ME BUILD THIS DEVICE THANKS =D

It does not matter what signal I use or how I transmit the signal. What matters most is that the end product should have a feasible transmitting/receiving range of let's say 100m, consist of minimal number of interferences from other devices, portable and user-friendly. If we can get to this stage then later on maybe we have further improvise and innovate the product to a better finish.

Attached is a brief sketch of how my device should work.

Thanks mates,
RinGGiE*RasTa

Welcome to the PF.

A range of 100m would generally require you to use some licensed RF band. You might be able to use the ISM band (2.4GHz WiFi and microwave ovens), but the antenna will not be wristwatch size.

What is the application? Perhaps we can suggest some alternatives. RFID is short range as well, BTW. On the order of a meter or few meters.
 
Why not just use a PIR motion detector from a security system? Most of them have a relay output that can trigger all sorts of devices including LED's. I guess 100m would be pretty far for this sort of sensor as more motion detectors only work about 20 meters maximum.
 
Cannot you use several sensors around the perimeter (like a light beam break detector) and hard wire the sensor to your Led Indicator?
I am not getting the idea of wrist watch though!
 
berkeman said:
Welcome to the PF.

A range of 100m would generally require you to use some licensed RF band. You might be able to use the ISM band (2.4GHz WiFi and microwave ovens), but the antenna will not be wristwatch size.

What is the application? Perhaps we can suggest some alternatives. RFID is short range as well, BTW. On the order of a meter or few meters.

Well basically, the application for this device is to remind the user of putting on his safety gears whenever he enters a site that requires him to have safety gears on.
 

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