OpenSprinkler Forums Hardware Questions DIY Kit Assembly Questions Not every 2.2u board is equal

This topic contains 4 replies, has 3 voices, and was last updated by  Ray 3 years, 11 months ago.

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  • #39843

    kirkb4989
    Participant

    Hi,

    I was trying to put together a BOM for the bare boards for the 2.2u DIY boards I just bought from your store. I see you state that one can generate a BOM from the Eagle SCH and BRD file and that is true, HOWEVER, the 2.2u board in the Github does not match the 2.2u boards I received (the picture here: http://rayshobby.net/cart/pcb_osdiy22?search=2.2u matches my boards)!

    The 2.2u DIY board in Github has the ATMEGA at 16MHz and uses a different voltage regulator chip for the power. The board I got looks closer to the 2.1 board as far as layout (it uses the same LM2596 buck coverter) but I am concerned about OTHER parts differences.

    Is there a board and schematic file for the 2.2u board I received rather than the incorrect 2.2u schematic on Github that appears newer???

    Thanks!! Kirk

    #39852

    Ray
    Keymaster

    Sorry about the confusion. There are two slightly different versions, as the two sets of files in Github indicate:
    https://github.com/rayshobby/opensprinkler/tree/master/OpenSprinkler%20Controller/hardware/v2.2/diy
    I am pretty sure what you should be looking at is the os22_diy, not the os22_rev_diy. The difference between them is mainly that the former uses LM2596 regulator while the latter uses MC34063. The crystal for both versions should be 16MHz (the schematics say 12MHz, which is a mistake — 12MHz is what OS 2.1 uses). The voltage regulator on your PCB is MCP1700-33 (small, SOT-23 type).

    • This reply was modified 3 years, 11 months ago by  Ray.
    #39863

    kirkb4989
    Participant

    Ahhh! I totally missed that version on the repository. It sure does seem to match!! I am pretty good at SMD soldering so I should have no issues building this- I already have most of the parts on hand.

    Thanks!!!

    #39865

    TheDeadly1
    Participant

    Is that 16MHz crystal for both the CH340 and the ATMega644?

    #39878

    Ray
    Keymaster

    No, CH340 uses 12MHz and it’s a small surface mount component. ATmega644 uses 16MHz. ENC28J60 uses 25MHz.

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OpenSprinkler Forums Hardware Questions DIY Kit Assembly Questions Not every 2.2u board is equal