DIY and Tinkering

Monat: Juli 2020


Currently I am preparing the bird nest cam. The ESP32 cam can be powered on two levels: On 3.3V or on 5V. In several articles on the web I found the information that the ESP32 Cam does sometimes not work properly when powered on 3.3V. Therefore I decided to power it on 5V. The LiPo cells of my old MacBook deliver 3.7V. So I needed a step up converter also called boost converter.

Summertime Project with the Kids: Soap Bubbles

Covid makes us still stay at home. Meanwhile we are allowed to leave home, but where shall we go? As the number of possible opportunities is limited, I had an idea of a nice little project with my kids: A soap bubble machine!

We took some parts of the Arduino starter kit and some Lego bricks and a few hours later it was finished.

Recycling old batteries

I found my 2007 MacBook in the attic and took it apart

MacBook 2007

I will try to re-use as many components as possible in my future projects, but first I’ll have to learn more about Apple’s components. I started with the battery. In its case are 6 LiPo cells. Unfortunately two of my cells are damaged, but that means 4 are left for further usage. Currently I am trying to charge them with the help of a TP4056 board and a 6V 200 mA solar panel. But to gather more data, I first needed to build a data logger.


The four remaining cells are in a good condition. It did several tests with them. I will use at least one of them as battery for my ESP32 cam.

Meanwhile I ordered a HDMI board at Amazon (LCD/HDMI-Karte für 12,1 Zoll / 33,8 cm B121EW03 V2 LTN121W3-L01 LTD133EX2X B133EW01 V4). With the help of this board I am able to use the display of my old MacBook as monitor of a Raspberry Pi4. I will build an Magic Mirror with those components.

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