alarm to track child - Page 1
Forum section: electronics / projects

author: mampmamp
author_rank: Newbie
timestamp: March 25, 2014, 05:30:05 pm
content: I want to make an alarm to track my child in very noisy places and with many people.The system would consist of two parts, one is secured on my hands and the other is with the child. the operation would be simple, eg parent and child are in a busy store, the child suddenly vanishes, then the father takes the device out of his pocket and presses a button, then the device that the child emits a loud sound too high, ready , ie as if the child had given a loud scream, and then only locate Where'd came the "scream". This device would make my life better.I have experience with programming in assembly, and little in electronics.If someone can help me thanks.

author: dr.diesel
author_rank: Super Contributor
timestamp: March 25, 2014, 05:41:29 pm
content: You needthis.

author: Dave
author_rank: Super Contributor
timestamp: March 25, 2014, 06:43:27 pm
content: This comic comes to mind:

author: c4757p
author_rank: Super Contributor
timestamp: March 25, 2014, 06:53:26 pm
content: Don't children already emit loud sounds, like, every thirty seconds or so?You could pretty much rig any RF-controlled battery operated pair of devices to do this. So dr.diesel wasn't far off, just shove a buzzer in there instead of the high voltage generator...Doing itentirelyby yourself would be much harder, there's a lot to consider when making even a simple radio-transmitting device.

author: dfmischler
author_rank: Frequent Contributor
timestamp: March 25, 2014, 07:00:43 pm
content: Why build what you can easily buy?GPS dog locatorChild locator products

author: Len
author_rank: Frequent Contributor
timestamp: March 25, 2014, 07:13:45 pm
content: Quote from: c4757p on March 25, 2014, 06:53:26 pmYes, but the latency is too high. It's amazing how much trouble a kid can get into in 30 seconds.

author: pickle9000
author_rank: Super Contributor
timestamp: March 25, 2014, 09:29:31 pm
content: How about a keyfinder?http://www.ebay.ca/itm/No-Radiation-1-To-1-Anti-Lost-Alarm-RF-Wireless-Super-Electronic-Key-Finder-/390724376310?pt=US_Surveillance_Gadgets&hash=item5af8fcd6f6

author: mampmamp
author_rank: Newbie
timestamp: March 26, 2014, 06:45:58 pm
content: the keyfinder would be cool, but I need to amplify the sound signal. for me, amplifying the signal is easy, the problem is to get enough tension for the sound to be very high. I thought of using a battery of mobile phone, but the maximum decibel I'll get will be equal to own maximum ringer volume of mobile phone. but i need a higher sound than that...

author: Dave
author_rank: Super Contributor
timestamp: March 26, 2014, 08:08:23 pm
content: Quote from: mampmamp on March 26, 2014, 06:45:58 pmNope. Battery voltage does NOT dictate the maximum volume of your mobile phone's speaker.

author: mampmamp
author_rank: Newbie
timestamp: April 01, 2014, 06:46:16 pm
content: what dictates the maximum volume?

author: lapm
author_rank: Frequent Contributor
timestamp: April 01, 2014, 07:04:33 pm
content: When i was child there was this lowtech solution: Harness that is put on child and long lease attached on it.https://www.google.fi/search?q=child+harnessAlto even cheaper solution would be pay attention what your kid does and teach him to stay close...Sorry, could no resists, dont take my advice too seriously.. Has been hard day and im bit on edge...

author: lapm
author_rank: Frequent Contributor
timestamp: April 01, 2014, 07:06:23 pm
content: Quote from: mampmamp on April 01, 2014, 06:46:16 pmproximity to candy section of store i would imagine based on my own observations..

author: AG6QR
author_rank: Frequent Contributor
timestamp: April 01, 2014, 08:05:51 pm
content: Quote from: mampmamp on April 01, 2014, 06:46:16 pmIt's a matter of power, not voltage. Current, impedance, and speaker efficiency enter into it.Suggestion: assuming you really want to do this, consider making it so that the parent's unit transmits a coded signal every 5 seconds or so. The child's unit can be set up so that, if it misses more than two or three consecutive pings from the parent's unit, the alarm sounds. The button on the parent's unit can either be designed to shut off the "ping" transmissions, or can transmit a different code which means "alarm immediately".The idea is, if the child's receiver gets out of range of the parent's transmitter, the alarm would go off regardless of whether the parent pushed the button.Though I'm a parent myself, and while my kids have been separated from me in public a few times, I don't think I'd go for a technological solution.

author: mampmamp
author_rank: Newbie
timestamp: April 02, 2014, 04:32:27 pm
content: Thanks AG6QR, my son is an autistic boy, the relationship between father and son in this case is quite different.I already bought a device that works identical to your suggestion, unfortunately does not work for this type of situation (situation as I described above)I need an autism parent (that seems like no one understands that situation, hehe), which is in the same situation as me, and like my idea, and like electronics too, so that together we can do, alone it is very hard for me. meet someone like this, i think, is very hard too.