Need help limited vision problem

Hi Mark,

I built something similar for my mom who was in a nursing home. When she was in bed she could not see whether the light had been activated or not. I built a sensor that sat on top of the little green light on the panel and when ever it was lit a circuit would turn on a flashing red and blue LED. Mom could see the flashing of the LED on her ceiling. The nursing home would not let me tap into the circuit so I made the unit totally isolated from the system. Here is a link to the project.

https://www.element14.com/community/people/jw0752/blog/2016/01/15/building-an-led-amplifier-for-mom?sr=search&searchId=c33c3adb-c11b-46ff-99c9-b2cd22c6188f&searchIndex=0

Instead of making an LED flash this circuit could drive a small piezo buzzer which would make the sound that you are looking for.

John

Hi Mark,

In thinking about your situation over night I have a couple of questions. Do you really want a sound that would continue for what might be a quite long time. If your nursing facility is anything like my Mom's was you may be waiting a half hour or more. How would you power the sensor module? In Mom's room there was a real shortage of outlets and their placement was poor. The facility would not let us multiple tap an outlet so we were always having to deal with batteries. They also might prohibit use of a device that is not UL approved so batteries might be the only option. The module that I built ran on batteries and we got about 3 months out of a set of batteries. Adding sound to the module would probably cut this time in half. Are you planning on building the device yourself or do you have a friend that will build it for you? My skills are able to design a unit like the one illustrated in my link but I do not have the skills to tie it to your laptop. A timer could also probably be added but this again would consume the batteries much faster and make the design of the project a much bigger deal.

John

I do have my desktop computer 3 feet from the wall mounted LED. I leave my computer on 24/7 because it records what is going on in my room in case something happens. I have tried to think of a solution of some kind of  sensor that would monitor the LED using USB And use my computer to trigger a sound. I had hoped to find some kind off light sensor to USB that would be simple and use the power of my computer nearby.

Any ideas are greatly appreciated;

Hi Mark,

How about using an Arduino? Monitor the output from the light sensor on an analog input to determine whether the light is on or off. Then depending on the state send a serial message indicating that state over to your computer. You could then use something like Processing (https://processing.org/) to read and interpret your serial data and create a clear display on your computer.

Best Regards,

Rachael

Velleman do an educational kit (EDU005 USB Tutor Board) which may be of interest.

https://www.vellemanusa.com/products/view/?country=us&lang=enu&id=525980

It has a LDR light sensor on board and has example programs that you can run and adapt on your PC to read the sensors on a PC over the USB connection.

Seems kinda crazy to require a computer to monitor a LED.......however.....

I had to do this once when my furnace was acting up.  I took a length of fiber optic cable and glued it to the furnace next to the fault LED and ran the fiber cable upstairs to my bedroom.  I attached the fiber to the edge of my bed headboard so if the furnace fault LED turned on, I could see it through the fiber next to my pillow.  At 3am it was bright enough to tell me when the furnace wouldn't light up.  A length of fiber optic cable might be all you need to "see the light" - no batteries required.

...or ...program a robot droid to go find the nurse and bring them back.....

Scott

Good idea I had never thought of that

Would it be possible for a cheap webcam to simply be parked right in front of the LED and you could run an app that would audibly indicate whether the LED was on whenever you wanted to know its status? Or it could audibly beep once per minute as long as the LED is on.

Or a Digispark and use the USB.

Another really cheap easy solution I saw was hacking a computer mouse.

In this case the software detected one of the buttons and did whatever it needed to do. The electronics simply provided a closed circuit (opto coupler) across the button.

Mark