SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T08:14:26-06:00SparkFun ElectronicsRobomaniac on Finding Missing Objects with RFID, Part 2Robomaniacurn:uuid:c8d5896c-e553-74dd-4191-fea06061e4532021-09-10T06:23:01-06:00<p>I fly FPV drone and we have buzzer on them that we can trigger with remote. There is also a way to program the motor speed controller where after X amount of inactivity the ESC start making the brushless motor beep. Yes brushless motor can be use as sound device. They do startup sound and some 32bit ESC can even play music. Anyway, I program mine to be activated with remote and also start beeping after 2min of not spinning. I would do something similar with the frisbee. I would use the shell of the frisbee to be the speaker chamber, exactly how the airtag is using the case as to amplify sound waves. Airtags are great but in tall grass, range is short.
btw, I totally want to see that 350$ UHF scanner in use!<p>How many frisbee can you buy for 350$?</p></p>
Customer #859347 on Finding Missing Objects with RFID, Part 2Customer #859347urn:uuid:4085a5e3-686e-3a70-fcea-d988d76b149c2021-09-08T16:25:03-06:00<p>The comment about cost really comes down to how many items you plan to track and total cost of ownership.<p>The reader you linked to in this article is rather inexpensive (most I've seen are around $1400-1600 USD) and even that I'd consider to be fairly competitively priced.</p><p>If you look at alternative tracking technologies (UWB / BLE) the price per tag is significantly higher than $0.25-0.50 per tag, so if you plan on tracking more than 10-15 items, then what you've presented here is in fact the lower total cost solution</p><p>for example: $99 (for 4 tags) AirTag bundle is right around $25 per tag so
15 items @ $25 per item is right around $375,
vs
$0.4 x 15 + $350 for the scanner which would put you at $356 for the RFID solution</p><p>This isn't taking into consideration passive RFID tags (as you mentioned) also don't use batteries, so there's also no need to replace batteries down the road so no residual maintenance cost (though they may fall off so you might have to replace them if what they're stuck to doesn't stay stuck).</p><p>On the down side localization of RFID isn't great, going purely on RSSI which is prone to interference and reflection but is better than nothing. UWB tends to outshine RFID or BLE in localization / RTLS but as has been mentioned is far more expensive per tag.</p><p>Great article!</p></p>