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# finding the distance by determining the TOF using two arduino and RF link (433Mhz and 315Mhz? Answered

I would like to measure the distance by knowing the Time of flight between the two arduino and two 433Mhz Rf Tx/Rx and two 315 Rf Tx/Rx. Is this possible? if not, what are the alternative way to measure the time of flight and measure the distance? I already know about the Ultrasonic and laser so i want to use the radio frequency. i hope you can help me. thanks!

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## 10 Replies

gocreeps1433 (author)2014-10-18

same with the one that documented in this site. i will use the formula Distance = ( time * speed of light) / 2 ... the time in the formula is the time between the first arduino send the 1st signal until it received the 2nd frequency that came from the second arduino. like a stopwatch, it will start once it transmit then stop when it received.

steveastrouk (author)2014-10-18

what accuracy are you looking for? The discreet logic method's results were quite good.

steveastrouk (author)2014-10-26

The uncertainties in timing, using an arduino are going to be around 1000 feet, if not more.

gocreeps1433 (author)2014-10-26

maybe 80% was good. i just want to try if can get a value. adding an LCD screen to the arduino1 to show the distance.

petercd (author)2014-10-17
gocreeps1433 (author)2014-10-18

Thanks sir. i already see it sir. :)

iceng (author)2014-10-18

That's No micro-Processor but Faster Fast HC discreet Logic dividing the RF !

steveastrouk (author)2014-10-17

Interesting, but I'd like to see the error budget. I suppose it depends what the OP wants for accuracy.

steveastrouk (author)2014-10-17

Bear in mind light travels around 300mm in one nanosecond, and then ask yourself how you can DO that with an arduino who's minimum clock is around 500nsec.

iceng (author)2014-10-17

+2