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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Some questions about the project code and the CAN bus","articleBody":"Hello @ExperimentalAvionics\r\n\r\nMade a small one refactoring your code for `platformio`  or  `.pio` and replaced all `*ino` files with `*h` files\r\n \r\nI'm trying to figure out how to send altitude via the `CAN` bus\r\nI can't understand why you use `3 bits` to send altitude, even when the altitude is in feet,\r\n\r\n\u003e https://github.com/ExperimentalAvionics/EFIS_ModuleA/blob/b03a0863c105737ba51b5b4a39bdedf4cd190335/EFIS_ModuleA.ino#L185\r\n\r\nThree bits give a huge number gigantic figure and it is excessive.\r\n\r\n\u003e 2^{24} - 1 = 16,777,215\r\n\r\nEven up to `10,000 feet = 3 kilometers`, where small planes don't fly in principle\r\n\r\n\u003e canMsg[4] = AltitudeINT \u003e\u003e 16;\r\n\r\nalways equals `zero`.\r\n\r\nMade this conclusion in the serial port(in HEX):\r\n\r\n\u003e AltitudeINT = 553\r\n\u003e VSI = 77611\r\n\u003e \r\n\u003e canMsg[2]29\r\n\u003e canMsg[3]2\r\n\u003e canMsg[4]0\r\n\u003e canMsg[5]2B\r\n\u003e canMsg[6]2F\r\n\r\nAlso interesting is the variable\r\n\r\n\u003e Pressure_Int = pressure/10;\r\n\r\nDo you use it to get raw altitude values, but this is some kind of nonsense and these are just decibars?\r\nI'm interested in your project, I hope you clarify the above points🙂","author":{"url":"https://github.com/brightproject","@type":"Person","name":"brightproject"},"datePublished":"2024-10-23T01:12:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1/EFIS_ModuleA/issues/1"}