Good morning gentlemen, thank you for your attention. I’m new to the Ardupilot project, I haven’t set up one yet and I intend to start, I have some projects with Arduino and ESP in operation. I have a project for a cart to apply pesticides in a rural area, I intend to use a GPS signal and later RTK for high precision. I saw that there are several boards compatible with Ardupilot, as you can see for each board you upload the firmware according to the application (rover/plane). Well, regarding the issue of studying, making it viable and assembling it, I’ll read it to introduce the stroller. I need help with you to define the cost-benefit hardware, I saw that the pixhawk 4 can be used, can you help me with the cheapest hardware for my purpose?