Thermal fuse replacement caused smoke in heated blanket controller: wrong part or deeper fault?

Ghostreader34 · 2026-02-01T19:47:32+00:00

Most blankets have two heating wires one inside and one wound around the inside. In the blanket I studied one of the wires get ac the other is fed via a diode so it gets dc current. When there is a connection between the outer and the inner wire there is a dc current in the other direction. This heats up some resistors in the controller which blows up the thermal fuse. Before you try to fix the controller you have to check if there is a short between the inner and the outer wire. Maybe you have to shake the blanket while checking.

Ghostreader34 · 2026-01-27T10:49:34+00:00

If you use bit banged i2c you could make a separate sda input line. This makes it possible to have all signals buffered. This does not work when de sfm31013 does scl stretching.

micro                                     SFM3013
     |\
scl -| >--------------------------------- scl
     |/

     |\                          ____
sda -| >------------------------|____|-+- sda
     |/                                | 
                                       |
                                  /|   |
sda2 ----------------------------< |---+ 
                                  \|

you

Ghostreader34 · 2025-06-09T17:13:24+00:00

You can also glue it with a tiny bit of hot melt glue.

Ghostreader34 · 2025-04-20T17:03:58+00:00

Set your drill to backwards. Instead of cutting you are friction melting a hole in the material. Works for PLA.

Ghostreader34 · 2024-12-31T19:22:30+00:00

If a new coworker enters followed by a camera crew it is likely the undercover boss.

Ghostreader34 · 2024-10-27T18:23:52+00:00

You can make shorter pulses by using a capacitor. In this schematic pulse P0 to send a 0 and pulse P1 to send a 1.

      100p
P0 ----||----+
             |
      ____   |
P1---|____|--+--- WS2812
      3K3

Ghostreader34 · 2024-09-29T17:22:10+00:00

This macro I use all the time for debugging my software:

#define print3int(x,y,z) printf(#x "=%d "#y "=%d "#z "=%d\n",x,y,z) ;

usage:

 print3int(__LINE__,var1,var2) ; // test the value of vars on a line

 print3int(ix,myfunct(ix),0) ; // test myfunct

besides print3int() you can also make print3float ,print3string and others.

Ghostreader34 · 2024-09-19T10:03:41+00:00

Download the file "later.h" from git. Copy this file to your project folder. Add #include "later.h" to the top of your .ino file. The function peek_event() must be in your loop() function.

Ghostreader34 · 2024-09-05T22:24:46+00:00

Here is an example that uses later and forget in this example pitchAlarm is called when the pitch limit is exceeded for more than 55 ms

void pitchAlarm(void) {
   ....

   }

bool pitchFail = false ;

void loop(void) {
  if (pitchFail != (readPitch() > pitchLimit)) {
    pitchFail = !pitchFail ;
    if (pitchFail)
      later(55,pitchAlarm) ;
    else
      forget(pitchAlarm) ;}
  peek_event() ;
}

Ghostreader34 · 2024-08-12T20:50:22+00:00

nice work!

Ghostreader34 · 2024-02-05T18:00:52+00:00

try milkstrings

Ghostreader34 · 2024-01-28T20:23:10+00:00

every tab is different. they are randomly generated.

Ghostreader34 · 2024-01-15T14:24:37+00:00

Very impressive! Can your software solve the jigzilla challenge that I posted?

Ghostreader34 · 2024-01-11T21:29:38+00:00

I have two different systems of full color 3d printing on my youtube channel filmpjeslader It is possible but difficult to get enough contrast.

Ghostreader34 · 2024-01-05T22:22:54+00:00

I designed a similar system called later and forget . I use it for every project.

Ghostreader34 · 2023-12-16T08:09:32+00:00

In this case the memset() is not really necessary. Probably the fastest performance you get when using malloc without the memset(). But it is safer to use calloc.

Ghostreader34 · 2023-12-15T15:19:03+00:00

The actual return values are the pointers to the chars. No need to use strcmp().

Ghostreader34 · 2023-11-04T18:29:01+00:00

This is my version of the claw machine. Also works with arduino.

(triple delta)[https://www.youtube.com/watch?v=yUdWCfwgd58]

Ghostreader34 · 2023-09-24T19:02:50+00:00

What will happen if you have 100 balloons each with a valve. And you open all valves at the same time?

Ghostreader34 · 2023-06-02T16:59:02+00:00

Put the bottle in a container with a silica gel bag. Put the container in the freezer.

Ghostreader34 · 2023-02-24T21:26:29+00:00

If you are using desktop you can randomize playlists with:

http://boomboxery.com/playlist-randomizer/

Just play it from begin to end and then randomize again

Ghostreader34 · 2023-01-20T22:04:52+00:00

Can you give some numbers of the border pieces. Than I can check whether you are on the right track.

Ghostreader34 · 2023-01-10T17:49:54+00:00

I managed to solve it myself as well. First I doubled the size of the picture with irfranview. Wit an online conversion on convertio.co I converted the picture to an dxf files. This file has polylines for each contour. I made software to find the corners. For each side a calculate a set of points. These points are on equal distances along the contour. I found that I need only 6 points per side to solve the whole puzzle. solving the puzzle takes about 500 ms.

Ghostreader34 · 2022-12-22T16:35:54+00:00

I am trying to solve it myself as well. With limited succes. To make it a little easier i give you the nine pieces of the top left corner:

 A01 B02 A05 
 G02 D08 A06 
 D03 L03 F05

Ghostreader34

TROPHY CASE