Saturday, 9-January-2021

SIM800L GSM module + Arduino, my first test

EN

In that part, will try to explain my effort to do some primary test with GSM module SIM800L and arduino Nano.
Yes, in fact there are many ready library, ready tutorials or examples over the internet that show similar projects done. I did not discover the fire for everyone.. just small light for myself.

What was my initial intent?
To make some device that I cans send SMS to, with some commands and when it recognize it send some answer(if requested).
Some of the ready projects you can find request weather station data, or sensor`s data. In my test, it follow just base concept that can be made more complex if need.
[Read More…]

Sunday, 3-January-2021

Raspberry Pi - over voltage protection / Raspberry as “notebook”

EN

Will start with the second part of the title : Raspberry as “notebook”. Well, to be honest it come a bit misleading. It is not close to notebook, or tablet but more as : home DIY pc..
I have some Notebook TFTs at home, and they can be used as screen with proper driver. For that part Aliexpress have quite some offers and I order one HDMI (input) to LDVI driver. It come with control buttons, backlight control board, IR remote and LVDI cable. So far so good. It required 12V power supply of at least 2A. My switchable supply has 12V option with 5A output, and is perfect for the job.
Next in the list was DC-DC step down converter, and again you can buy half kilogram on reasonable price over the internet. When prepare it for mount, the pot I replace with 5.6kOhm resistor and the output was steady 5.1-5.2V, and that is perfect for the Raspberry. [Read More…]

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