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It basically consists of four basic blocks: The architecture of a VTX of those used in FPV is quite simple. Use non-standard frequencies: Transmitters usually have between one and eight channels that we can select, this means that everyone is on one of those channels, if we can choose a frequency that does not coincide with that of any of those channels we can use that frequency for ourselves, exclusively, without interference.We have interference on the frequency we are using and our model aircraft is far away? Well, we change the frequency remotely (we can even save our device or avoid safe loss). Change video channel of our plane or drone remotely by radio control.In addition to the example mentioned above that allows us to vary the emission frequency automatically in order to analyze antennas, we could use it to: The profits are many, and only the imagination is the limit. In fact, I have tried other transmitters of different powers and other physical aspects and all have worked correctly. I did the whole process using a 800mw VTX Partom, one of the most used in model airplanes, but the good thing is that almost all video transmitters that have this physical aspect, such as the VTX FOX (and many others), use this same PLL and protocol.
FPV TRANSMITTER CODE
I also found some code to use as a base, but sorry, since I did this project several years ago, I can't find the original author to give it credit.
FPV TRANSMITTER HOW TO
I was looking a lot on the internet and I found very little information, so I decided to start almost from scratch and do all the analysis of the protocol that the VTX microprocessor uses to communicate with its IC PLL (an MB15E07L, manufactured by Fujitsu, which is the integrated circuit that creates the emission frequency), to know how to control it, and to write the Arduino code.Ī little bit of reverse engineering doesn't hurt anyone.įortunately, the user Changosurf had already described the PLL protocol, although it did not work for me as it was and I had to do more research (the data from the 18-bit latch register did not work with my VTX, nor with any of the ones I tried ). Specifically, what I wanted to achieve was to make a antenna analyzer, also based on Arduino (which is made and works very well, I have to describe in the Blog how I did it and publish the code) that it was able to do a frequency sweep, for example from 1.1 Ghz to 1.4 Ghz, with steps every few Mhz, measuring the SWR in each of these steps to be able to capture all the data in Excel and make a antenna resonance graph in that frequency range. Some time ago it got into my head control a 1.2 Ghz video transmitter with an Arduino. 7 SWR tester antenna analyzer with Arduino.6 Modifying the VTX and connecting to the Arduino.3 Architecture of an FPV video transmitter.1 How to control a FPV VTX with Arduino.CO2 Gadget Boxes, 3D Printed and without 3D Printer.CO2 Monitor on your cell phone with ESP32 and Sensirion SCD30 sensor.CO2 Meter TFT Color Display with TTGO T-Display Sensirion SCD30 - The CO2 Gadget.CO2 on a giant screen for bars, restaurants, classrooms and the like.
FPV TRANSMITTER FULL
Full color touch screen for CO₂ meter Wow!.Are home CO₂ meters as reliable, accurate and precise as commercial ones?.Add temperature, humidity and atmospheric pressure.Use the Senseair S8 sensor in the CO2 Meter.Sensirion SCD4x CO2 sensor (SCD41 and SCD40).Comparison of CO2 sensors MH-Z19B vs Senseair S8.Winsen MH-Z1311A Low Power NDIR CO2 Sensor.Sensirion SCD30 NDIR dual-channel CO2 sensor.