I have developed a telemetry module for FrSky Smart.Port that works without any problems. As shown in the attachment I use an ATMEGA Beetle for the telemetry data transmission which is connected to the port D11 and the S.Port on the RX8R. The serial data transfer on the Beetle is done with the SoftwareSerial library with signal inversion. What I cannot explain is why the TTL levels of the two communication partners are so different. The TTL level from the receiver has a little over 3V peak and the Beetle is also coming in at 1.67V. I have no clue why that is so! What can I do about it, for example, use a transceiver ...?
Re: Arduino Project: FrSky S.Port (Smart.Port) data transfer with Beetle ATMEGA23u4 via softwareseri
You possible measured between 5V and the signal wire. When the µC is powered with 3,3V and outputs HIGH (3,3V), the difference you measure is 1,7V.
Re: Arduino Project: FrSky S.Port (Smart.Port) data transfer with Beetle ATMEGA23u4 via softwareseri
The operating voltage 5V
Re: Arduino Project: FrSky S.Port (Smart.Port) data transfer with Beetle ATMEGA23u4 via softwareseri
It´s fixed see here: https://www.avrfreaks.net/forum/frsky-sport-smartport-data-transfer-beetle-atmega23u4-softwareserial#comment-2853441
Watch this topic
Disable multi-page viewPlease log in before posting. Registration is free and takes only a minute.
Existing account
Do you have a Google/GoogleMail account? No registration required!
Log in with Google account
Log in with Google account
No account? Register here.