The power and ground runs from the regulator still need to be routed, but this is a likely safe bypass cap layout for both the regulators and the cpu.Ī (54. I’m assuming here that there are no physical constraints on the board (i.e components can be moved to simplify routing.). As well I moved things around to make routing easier and the distance to the crystal shorter while hopefully leaving room to run the power connections. 1uf caps, one for the 3.3V regulator and one for the atmega.) As you will see I removed all traces and all vias (and the text) to start from scratch. That said here is a sketch with what I think are the correct bypass caps (I added 2. I think you may have routing database problems, some of the rats nest lines in pcb are acting strange. Can the components all be moved around to simplify the routing? Is there any thing that needs to be where it is on the board for external reasons? If not, when you have cleaned up the temp directory I’ll have a look at routing the board in minimal space. I connected my Arduino UNO with my custom board like shown in the fritzing schematic below. I have printed the custom PCB and soldered everything in place now I want to program the bootloader. At worst the CPU won’t work when the boards are made which means you will have to redo the boards. Im making a custom board with AtMega2560-16AU as MCU and CH340G as bootloader (schematic can be seen in the picture). I expect the routing still wants to be as direct as possible. It looks from the photo that it indeed doesn’t need to be that close. I understand that the cristal and bypass capacitors should be as close as possible from the microcontroler, but are you shure it must be that close?
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