Show And Tell: Poly - Building an RC Airplane The Hard Way

RE: Show And Tell: Poly - Building an RC Airplane The Hard Way

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RE: Show And Tell: Poly - Building an RC Airplane The Hard Way

Daniel Veilleux — Thu, 11 Jan 2018 18:29:59 GMT

Hello John,

Although the nrf_esb module doesn't have its own frequency hopping implementation, it does allow you to change frequencies quite easily. So when you power up my transmitter it reduces its output power and starts broadcasting a packet on a fixed address and frequency. This packet includes the "transmitter channel" and update rate -- each "transmitter channel" specifies a radio address and a list of frequencies to use. When the receiver gets one of these packets it sends an ACK back to the transmitter and the two are now synced. From then on, both transmitter and receiver use a timer to decide when to turn on their radios. After a packet is received (or missed!) both sides move their radio to the next channel in the list and the process is repeated.

So the idea is to set the update rate to higher than what you actually need to maintain control of the receiver -- this provides some redundancy in case a packet is lost. One packet is sent per channel and the channels are spread out across the 2.4GHz band so interference in a particular part of the band probably won't cause consecutive packets to be dropped. You can get as fancy as you want but I find that constantly moving through the channels works really well.

RE: Show And Tell: Poly - Building an RC Airplane The Hard Way

John So — Thu, 11 Jan 2018 08:01:32 GMT

Hi Daniel,

The original ESB lib does not include any frequency hopping algorithm. Would you elaborate more about how you do frequency hopping ?

Thanks John