GOOD COMPUTER: Broken SD module

2020-07-12 13:29

started messing with this SD card module. seems it’s not properly SPI compliant, as it’s driving CIPO low even when not selected. I think I found the bug; the buffer on that line has its enable pin tied to ground, so it never stops. gonna try lifting it and tying it to CS instead

2020-07-12 14:26

super pro environment lol

2020-07-12 17:11

nothing to it. just gotta use these enormous ham hands to lift pin 13 (4/OE) of U1 and connect it to pin 9 (3A) with a trace. no big deal at all ⚡

2020-07-13 20:52

because I have no skills and no proper tools and no space to move, I’m lifting half the chip with an iron, then will try lift the single pin, and put the whole lot back down. unlikely to work but eh, it’s a cheap part that wasn’t working properly anyway

2020-07-13 20:58

broke three pins. they’re so fine! oh well, shopping time

2020-07-13 21:47

all the cheap ones seem to be based on the same sketchy design (as much as you can tell from thumbnails on store sites anyway). @adafruit and @sparkfun both have different designs and look good from the schematics. @lbhq have them locally, so round 2 soon! https://littlebird.com.au/products/sparkfun-level-shifting-microsd-breakout

originally posted on twitter at: https://twitter.com/robn/status/1282155072483287040