Hi all I have been trying to get one ultrasonic sensor (hc-sr04) to send and another to receive using rf to snyc the two arduinos Now I have gotten them to work but the readings are never the same they vary about 2-4cm the whole time which is not very good for what I need, It is most likely timing…

Wireless (separate) ultrasonic receiver and transmitter

DrDiettrich August 28, 2016, 9:02am 2

I don't understand your code. You seem to send a ping from each sketch?

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