LTC4054 doesn’t work.

I don’t have any resistors on CC1 & CC2 since I’m okay with using USB-A to USB-C. However, it gives absolutely nothing when plugged into a power source. I’ve tried removing the resistor R14, but it made no difference. Am I doing something wrong?

u/Educational-Wish1511 — 26 days ago
▲ 61 r/arduino

My custom ESP8266-12F based board.

I made this little thing for a school project. The only problem is that you can’t charge the thing. The USB-C port is basically a decoration, since it doesn’t work for some reason. Not as small as I had hoped, but still pretty nice.

On the front is a 0.96” 64x128 OLED operating with I2C. A 200mAh battery, with two buttons, one of which is connected to GPIO 0. It’s around 8.5 mm thick, which is not bad.

u/Educational-Wish1511 — 26 days ago
▲ 8 r/diyelectronics+1 crossposts

Does someone know why this doesn’t work?

I’m using an ltc4054 for a custom charging circuit in my PCB. I don’t see where I did anything wrong. I removed the 100 ohm resistor on the chrg# to rule out any shorts. The board doesn’t even get hot when plugged in. Just nothing. Does the ltc4054 require a battery to operate? I’m pretty sure it doesn’t, but I don’t know.

u/Educational-Wish1511 — 26 days ago
▲ 0 r/miband

Has anyone’s ceramic casing gotten scratches?

TLDR: My ceramic Xiaomi smart band got scratched, and I don’t know why.

I’m using the White Pearl Xiaomi Smart Band 10 which has the white ceramic casing. I tried scratching it against metal for fun, which left a slight mark. My dumb brain tried to clean the mark by scrubbing it against a window. I ended with a scratched up band. No matter what I do, the marks won’t go away. They also get caught under my fingernails, so they’re definitely scratches.

I thought ceramic doesn’t get scratched with glass. Can anyone explain this phenomenon?

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u/Educational-Wish1511 — 2 months ago