My projects

My projects

My DIY electronics projects

Saturday, 06 February 2016 04:48

And here’s one more project that shows: laziness makes the progress. I have a fish tank in my room – but I am too lazy to turn on the light in it and frequently forget to feed the fish. And the sound of constantly working air pump annoys me. The fish and water plants felt themselves bad in such a conditions. So the automatic aquarium controller became the one of my first DIY electronic devices.

Saturday, 23 January 2016 08:27

I have a home-made automatic garden watering system at my country house. It's made on a base of 

Arduino Leonardo. It works quite properly - but there's always a place for perfectioning. So, I have thought: why water the ground when it's already wet - for example, after a rain?  And I decided to attach a soil moisture sensor to the automatic watering system.

Saturday, 23 January 2016 08:05

And here is my homemade automatic watering system controller!

There'll be a few schematics as I designed the controller in a modular way. It's convenient because if sometime I'll want to improve something - I'll not to redo everything.

Now then, let's see what are the parts of the controller.

Saturday, 23 January 2016 05:56

Recently I have bought a bunch of  a Lithium-ion batteries at Aliexpress. Their capacity is declared  a 1200 mAh  for UltraFire YF 14500, and even a 6000 mAh for UltraFire SJ 18650.

But it is not very reasonable to believe that ambitious numbers are true – according to their price. So I decided to make a simple schematic that can measure the true capacity of these accumulators. One more possible problem may be the high internal resistance. It may result in a major voltage decrease under load. So it will be nice to measure it, too.