It Started With a Hardware Limitation I have been using Quectel GNSS modules in my designs for a while. They are reliable, well-documented, and the support ecosystem is solid. But the module I had been using had one problem that I kept running into: no external antenna support . For most projects that is a minor inconvenience. For a marine vessel monitoring and control system , it is a non-starter. A vessel hull blocks sky view, antenna placement is critical, and the difference between a clean fix and no fix at all often comes down to whether you can mount the antenna where it actually has line of sight. An integrated antenna in a sealed enclosure below deck simply does not cut it. So I went directly to Quectel. The Conversation With Quectel I reached out through their official sample request channel. I was not expecting much — most component manufacturers have a standard process: fill out a form, wait, get a few uni...
Its been a while that i am working on an autonomous vehicle and some major parts are tested and still going on with the project. For this project its better to have a manual override control via RC remote controller. After researching the RC controller and receiver i have found out the RC remote controllers use PPM signals to control the servo and ESC. In one of my earlier post's i have mentioned reading the receiver outputs and tested how it can be controlled. PPM signal out from the RC receiver. I have on of my bixler controllers and finally able to use it for this project. Hobbyking 6 channel receiver and 4 channel transmitter is used for this and i wont guaranty that this will or will not work with your projects. The PPM signal will vary depending on different vendors. I read all the output of the receiver and log it for further reference. Designing a circuit Since the code will be very very simple i decided to use ATtiny13A-PU as the micro contr...