OPENMV4 four-layer board

Drawing a development board that is cheap and can meet basic development needs actually has nothing to do with openmv, but everyone seems to be familiar with it. . You can flash that firmware, it’s open source anyway, right hhh, or writing it yourself is not a bad idea. Recently, I found a job and I’m bored. I’m playing with H7 for image processing. It’s easier to calculate. It’s equipped with a serial port screen or an M4 monitor. The interaction is pretty good. The drawings are relatively standard. I think (I think) most of the wiring pins are of equal length and are 2.0mm, because most of me prefer to use the bottom board. . . I plan to get an LCD screen and ESP32 on the bottom board, and then replace some of the pins with 2.54 or a white bayonet interface that supports OV5640 (high pixels and low frame rate) and OV7725 (low pixels and high frame rate). Here are a few pictures. . .

-----------------------------------------------Project V1.0 -------------------------------------------------- Board It looks like this. The frame rate of OV5640 is like this. The frame rate of OV7725 is like this. It supports MT9V043 in the back (grayscale, no verification). If you make the board yourself, you don’t need plug-ins, tantalum capacitors, or a 32k crystal oscillator. It costs more than 100. Flash verification. Oh, get the matching capacitor of this crystal oscillator. Wrong, please read the next version.

--------------------------------Project V1.2-------------- -------------------------- Then it was verified that a button was added after the first version to realize the switching of dfu in the board. . . . It is expected to be around December 20th. I will try to send materials and patches. Then I will write down my feelings/xyx. By the way, there are also ordinary prints, which are a bit stuck. In the end, they are all problems. I will still use professional offline prints if there are problems. Comments below.