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How to use H-bridge HG7881 (HG7881CP) module with external power supply and Arduino UNO

First-time use of H-bridge HG7881 (HG7881CP) module was pretty confusing for me. I didn’t find good (if any?) information about wiring this module up and running it with Arduino. But same time it seems to be quite popular. Here I share how I connected it to an external 12V power supply. You can use any other voltage

Accidentally blew a fuse of Arduino CNC controller by reverse polarity

Today I was messing around with my CNC shield (version 3.00) and GRBL. But somehow I managed to accidentally reverse the polarity of my power cables. Until today I had no problem keeping that in mind. The fuse was blown and like it’s not enough yet- drives also. DRV8825 drives have no reverse polarity protection-

Arduino CNC shield version 3.0 with GRBL v0.9

My experience with arduino cnc shield was bit frustrating at start. This article is about version v3.0 CNC shield. I didn't know anything about this shield, GRBL software and how gcode is sent to CNC machine. So I was pretty unsure about everything I was doing.

Tabbing solar cells together using this simple jig

Here is a simple solution to align and fixate cells while tabbing solar cells together using common tile spacers. This is very good because I can focus on soldering cells instead how they are aligned and fixed.

How to wire digital dual display volt- and ammeter

Once I bought a popular “Chinese” volt- and ammeter gauge with 100V/10A ratings. Unfortunately, I didn’t find any good resource about how to wire/connect it. Actually, it’s not rocket science, but I had waited for it 2-3 weeks and didn’t want to blow it at first try. All the diagrams were somehow too technical for me.

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