From: Bdale Garbee Date: Sun, 7 Jul 2024 00:40:42 +0000 (-0600) Subject: change design to specify the non-plus version of Omega 2S module X-Git-Tag: fab-v2p1~8 X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=8c5abc44adbb62d2ff89455044a9338bd28d65a7;p=hw%2Fquantimotor change design to specify the non-plus version of Omega 2S module --- diff --git a/Notebook b/Notebook index 7de6753..339ce8d 100644 --- a/Notebook +++ b/Notebook @@ -203,4 +203,39 @@ They call for 90R traces for the USB signals .. I've never sweated USB line impedance before, though, hopefully USB just works. + Note that the OM-O2S is 75% the price of the Plus version, which is $7.56 + difference in BOM! Plan on using the non-plus version unless we absolutely + must use the bigger one. The only differences are factors of two each in + RAM and flash size. Our application is simple enough I hope that won't be + an issue? + +- one of the things I've learned about OpenWRT is that using 'opkg upgrade' + doesn't work the way a Debian apt upgrade does. Quoting an authoritative + source on a forum: + + opkg doesn't have appropriate fail-safe checks to ensure proper + compatibility at the kernel level and other dependencies. This can + cause major issues with the installation, and therefore should never + be used. + + The implication of this is that if using OpenWRT, I need to think of it as + "a flash'able image" and not an upgradeable in place operating system. I + can't help but have mixed feelings about that. However, just generating + sysupgrade images and making sure the support for using them to upgrade the + in-place firmware is in my builds should work ok. + +2024.07.06 +- loaded a v1p2 proto board. since only the LPC runs AltOS and it's almost + not relevant, I'm going to run a separate serial number series for Quanti + products. This board can be sn 1, and I'll flash that into the LPC as well + as including it in the OpenWRT load somehow eventually. + +- the vertical USB connector will interfere with rectangular daughter cards, + which isn't good. Fortunately, Cvilux USA also makes a right-angle version + that fits in the same footprint (but of course will hang way off the edge + of the current board design). That seems winning. Same price. Added to + pref parts using -V and -H value suffixes to indicate which part, leaving + QuantiMotor design using -V for now since that's real. q10 put in my DK + cart for next order. If the -H version doesn't have some fatal flaw, I think + that's what I want to use. diff --git a/quantimotor.sch b/quantimotor.sch index 9149dba..dc3d94e 100644 --- a/quantimotor.sch +++ b/quantimotor.sch @@ -608,7 +608,7 @@ footprint=Omega2S T 44500 72500 5 10 0 0 0 0 1 device=IC T 51200 71900 5 10 1 1 0 6 1 -value=Omega2S+ +value=Omega2S } C 41900 68700 1 0 0 3.3V-plus.sym N 44100 68700 42100 68700 4