RPi repair: SD card slot

The Raspberry Pi uses as disk memory an SD card and for that purpose  has an on board SD card slot. The component is badly designed and breaks down easily as many an RPi owner has found out. It is a pity that the card holder is not more robust but on the other hand, the overall cost of the board had to be kept at a minimum.

2016-05-14 09.08.59

Anyway, the slot breaks down easily which gives rize to irratic behaviour. Lots of ideas have been posted to repair it and these range from glueing a piece of credit card on top of the card holder to replacing it by a micro SD card holder. None seemed satisfactory to me and I looked for a more robust solution.

It turns out that almost the same card holder is made by Würth Elektronik under the type name  WR-CRD. The advantage of this model is that it uses metal to force the card into position and not plastic as was the case with the previous one. The card holder is almost the same because, where the original has two switches the replacement only has the one for detecting the presence of the card. Carefully desoldering the broken card holder and – with slight bending of the contacts of the new card holder to the soldering pads before soldering will have an immediate positive result. It turns out that the other switch for detecting write-block is not necessary: the contacts can be left free (on the photo the top two small soldering pads).

This card holder now already is in function for half a year without problems. I assume it will last “forever”,  i.e. as long as the RPi itself!

Note added after repairing the second RPi. There are two issues to take care of: (1) the orientation pins on the back side – made out of plastic – should be removed so that the socket mounts flatly and (2) only the connections to the switch needs to be bent slightly to avoid short circuiting across the soldering pads.

 

Badcel verbouwen: afronding

Tja, wanneer is iets klaar. Aanvankelijk was het wachten op de schuifdeur. Die werd een paar weken later inderdaad gemonteerd. Toen konden we aan de inrichting beginnen en een van de belangrijkste ingrediënten was de rij glasplaatjes in de ontstane nis. Die hangen nu ook maar de ruimte er onder, daar zoeken we nog wat voor.  Hier en daar brengen we nu wat attributen aan, maar dat is niet zo belangrijk meer. Laten we de badcel daarom nu maar als afgerond beschouwen.

Hierboven een serie foto’s die het geheel illustreren. Een paar “gadgets’ zijn (natuurlijk) ingebouwd. Zoals een spiegelverwarming die werkt zolang de spiegelverlichting aan staat. En de dimmer voor de plafondverlichting. De aan-uit schakelaar moet nog in een lijstje met spreuken en dergelijke komen, daar zijn we nog mee bezig.

LircPi : nieuw apparaat bedienen met een stokoude afstandsbediening

Introduction

The project got started after a friend remarked that he could not find  vhs-players of a particular model and brand anymore. Before, I have helped him getting such machines going again, but given their age it is not surprising that more and more of them gave up. He needed these players for his partner who is not really capable or learning how to work with other remotes. Lees verder LircPi : nieuw apparaat bedienen met een stokoude afstandsbediening

LED lamp driver with remote control

Most spotlamps to build into a ceiling are ridiculously high, 8 cm or more. The reason is that most of them are still to fit halogen lamps that require a special mirror and produce a lot of heat. LED lamps should not have this problem because they spread light better and because they are so efficient as to not produce a lot of heat. But most lamps are still high, even if these contain LEDs, probably because companies need to get rid of parts/machines first before they renovate Lees verder LED lamp driver with remote control