Replace battery in Leifheit Dry & Clean 51000 3.7V

There is two versions of BFN18650 1S1P batteries in Leifheit Dry & Clean:

  • 3.7V 1800mAh – Li-Ion
  • 3.2V – probably LiFePo4 (Li-Po)

Check voltage on device:
Leifheit Dry Clean 51000 Battery 3.7V

Both are 18650 1S1P size. You have to buy version without extra protection pcb because it won’t fit.

If you would like to replace the battery just open case in left back corner. Disconnect the old one and solder connector to the new one.

You can use NCR18650B 3.7V with extra connector it is easy to solder:

trim fucked up my data on Crucial SSD

As always after upgrade Windows 10 it won’t boot. So as always I recreate the boot partitions by deleting them and create new one.

This time I have deleted by mistake my system partition, don’t worry just repair partition table. Then I have restored it. All files was OK.

First boot take a lot of time but finally I saw my desktop. After minute icons on my dekstop started disappearing. I shut down my system because i thought it is ransomware or something.

Recovery software shows all files is OK. MFT looks fine so i have restored them all.

Every restored file is full of null! That has to be trim fault.

SSD did not notice that I restored my partition and trim rewrite it with zero.

There is Crucial BX300 240GB SSD stats:

Cannot install MTP Device and cannot find wpdmtp.inf

On Windows versions N and KN there is no Media Feature Pack. MTP and PTP dirvers (wpdmtp.inf) is included in this pack.

Without it you cant send files to and from the Android phone.

Media Feature Pack for N and KN versions of Windows 10 (choose your language)

Unrecognized device in PTP mode:

Unrecognized device in MTP mode:

Arduino Nano with ATmega 328PB and Arduino IDE support

I did not notice that i bought Arduino clone with ATmega328PB not with the ATmega328P, there is CH340C USB-UART chip. 328PB version is newer chip, some kind better than old.

Main disadvantage that chip is not supported by Arduino IDE and it came with unsupported bootloader to load sketches via Arduino IDE (even with added support to 328PB).

I tried to flash new bootloader via USBasp but i can’t change fuse bits. Fuses stays as it was!
avrdude: verification error, first mismatch at byte 0x0000
0x00 != 0xff
avrdude: verification error; content mismatch

Somehow i have disabled SPIEN (it enable serial programming and data downloading) and i could not program it via ICSP anymore. I got error but 328pb will be alive:
avrdude: auto set sck period (because given equals null)
avrdude: error: program enable: target doesn't answer. 1
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.
avrdude done. Thank you.

Recover atmega 328 fuse bits

I have MiniPro Tl866 programmer that support atmega 328p programming. It not support 328PB, it has difference timings for programing but it works if you choose 328P.

But i could set fuse bits! You have to connect all pins like on scheme down below.

Then before you click program you have to connect XTAL1(PIN9) to pin 7 and XTAL2(PIN10) to pin 8 of 328PB (you have to touch it with small wires for 100ms of programming, do not need to solder).

Uncheck check ID. Set Config an click Programm with checked Config fuse bits and Lock bits:

Now we have to flash bootloader.

328pb Arduino IDE support and bootloader

We will use MiniCore that supports 328PB chip. On Arduino IDE 1.8.7 we can add support for this board in easy way. Open File > Preferences and add extra url for Board Manager:
Then go to Tools > Board > Board Manager and install MiniCore by MCUdude.

Now we can choose our board in tools:
Board: Atmega328
Bootloader: Yes
Clock: 16MHz external
BOD: 2.7v
Compiler LTO: Disabled (you can enable it if you need)
Variant: 328PB

Connect your programmer (i’m using usbasp) and choose Burn Bootloader.

Done, now you can write sketches via usb!

If something is still wrong you should set fuse by tl866 again or try this: For example open boards.txt from “C:\Users\user\AppData\Local\Arduino15\packages\MiniCore\hardware\avr\2.0.1”
Save & close the file.

You can use minicore for all 328p boards as well!

Done. Now we have fully functional 328PB with Arduino IDE.

Entware and pyLoad on Android 7.1 TV Box

Entware is repository full of apps for embeded linux like android on tv box. I have prepared installation script to install it from scratch because android is different. You have to rebuild folders in root on every reboot. Root partition is rebuilt on every boot from the image. I will use /data partition to store files (path /data/opt) and mount –bind on /opt.

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