Wireless 433mHz with Arduino, hitting the radiowaves

433mHz sender unit(left) and receiver unit (right)

I picked a pair of these up for 0.99$ each, so who can resist the tempation.

ACS712 30A interface with Arduino, measuring power usage

ACS712 30A sensor

The ACS712 is a hall-effect sensor, so when in using it be careful not to have any magnetic interference hitting the thing.There many variations of the IC this here is the 30A version. The current capabilities it can handle id conveniently located on the chip itself.

LCD and Arduino, getting readable output

16x2 on the top and 20x4 LCD on the bottom

The 16x2 LCD is salvaged from a 48V PSU that had lost it's magic smoke in a spectacular way. So guud guy that i was i hauled it home and dismantled it before it met it's end in a bin.

MPU-6050 and Arduino, sensing board movement

MPU-6050 sensor board

The MPU-6050 combines within itself both accelerometers and gyroscopes in all 3 axis. It outputs all of the data on a I2C output.

ULN2003 and Arduino, steppermotor control

ULN2003 and stepper motor 5V

This is the cheapest combination of stepper motor and controller i could get mi hands on, through ebay(2.92$ with shipping).

First impressions for this set is that you get what you pay for. The ULN2003AN is a Texas Instruments DIP chip. Circuitboard measures 32mm in width and 35mm in length. Chip is seated on a socket so if there are any complications, as in the magic white smoke leaking out, you can replace the chip. All of the board is a full through hole design so again if anything misbehaves just replace it. Soldering job is adequate for this kind of cheap-o standard. One solderbridge but that's the only thing that's amiss.

The Stepper motor supplied has the markings a 28BYJ-48, so it has 4 phases 8 beats. With internal gearing in 1:64. It's rated at 5V DC. Motor-s diameter is 28mm. And is supplied with 20cm wires.On the sides it has two mounting holes for screws, rivets or anything else you can think of for mounting.

Code for testing  

ENC28J60 and Arduino, ethernet for your microcontroller

ENC28J60

DATASHEET for the main chip on board.

What is Arduino

Arduino is a tool for making computers that can sense and control more of the physical world than your desktop computer. It's an open-source physical computing platform based on a simple microcontroller board, and a development environment for writing software for the board (as said by the developers of Arduino).

Cheapest arduino choices 

In all things combined it's the next best thing since the computers were invented. Anything you can imagine you can develop with it, and if you want to go to masses you can always strip it and use the Atmega microcontroller. 

Okay there are a few defects, mainly no integrated graphics department. But there are workarounds for that, although not as powerful that there should be but still it's a possibility.

In mi opinion why it's the next best thing is because it's popularity has skyrocketed. Because of that there are endless add-ons for it. That's why I said you can do everything with it, and so much has already been done by the community. Also the community who can argue with that. If you could ever get in some kind of trouble, there is always someone who can help you.