Amazing Home automation system with STM32F103 microcontroller Part 1

Amazing Home automation system with STM32F103 microcontroller

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This is ongoing project of building Home automation system ( smart home system ), which will for the start have measurement of temperature and humidity.

It will consist of number of parts ( number of blog posts ).

It is planed to work with micro controller STM32F103C8T6

 and 3.5" TFT LCD.

Next step will be to control relays for ceiling fan, etc.

Next will be to add ESP8266 to have connection to the internet, so the system can be controlled remotely.

Till now I have managed to make a printed circuit board.

Home automation board bottom

Home automation board top

Not really nice to look at, but it is working, and working from the first attempt :-)

The PCB is designed in EasyEDA, and made with toner transfer method 

Except headers for STM32 and TFT LCD, I have also added 3.3V and 5.0V linear regulators.

Beside this, there is also part with MC34063 as a buck converter, which is in front of small linear regulators.

This part is made with intention to connect this device to external power source of 12V.

Of course, everything is programmed using Arduino IDE and STM32duino board.

For measuring temperature and humidity we use DHT11 sensor, which measures temperature and also humidity and uses just three wires, plus, ground and signal.

 

DIY method of making PCB using toner transfer method

 

This is a DIY method of making PCB using toner transfer method. 

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The most important thing is to have good print , done with good quality toner. 
Here we use some dangerous chemicals so be very careful if you going to do this at home.
Please check following video for details, and I will show you also few steps in following points.

As a first step we use sandpaper to remove any oxidation from copper plate, than clean it with paper tissue.

Than we use contact cleaner or acetone to clean any grease.

Then we secure the paper with printed circuit with adhesive tape.

Then  we use nail polish remover ( or acetone - nail polish remover is actually acetone ), take small amount and spread it evenly on the surface of the copper plate.

Ten minutes after we can start to remove paper very slowly.

After we removed first layer of paper we put board into the water, and slowly rubbing we remove the rest of the paper.

This rubbing should be done VERY carefully, so we do not damage toner traces.

And in the end , the result is very satisfactory.

Next step will be to do the etching, which could be done with HCL and hydrogen peroxide.

Etching PCB with HCL and hydrogen peroxide

This is a DIY method of making PCB using HCL  and hydrogen peroxide .

Visit my Youtube channnels :  Electro_Magic ; Practical Tips  ; Delphi practical school             

The most important thing is to have good print , done with good quality toner. 
 Here we use some dangerous chemicals so be very careful if you going to do this at home.
Please check following video for details, and I will show you also few steps in following points.

First you must have good print, done with good quality toner.

      Then we put prepared PCB in plastic box.

For etching we use HCL and Hydrogen peroxide.We pour in HCL just enough to cover PCB, then we add a little of peroxide.

We immediately see how reactions with copper occur.

Here we see bubbles in the reaction of acid with copper.

After few minutes we can see full reaction .

After etching is done, we rinse pcb with water.

Use a steel sponge to remove any toner residue.

The PCB looks almost perfect.

It is very important to have a well-done print at the very beginning, with quality toner.

Tutorial by Kobyx Kitchen bar

Tutorial by Kobyx   Kitchen bar

Tutorial on creating kitchen bar by yourself.

Power resistor DIY

Power resistor DIY

This is one simple way to create power resistor at home.
I needed 0,33 ohm resistor with some larger wattage so I decide to create one, instead of buying one.
I always say, creating is much more fun then buying.

So you need one old high wattage resistor ( I had one 10W 100 ohm ) to use wire from it.You will have to destroy it, and take high resisting wire of desired length-resistance.
You also need some copper wire as connectors.
And you will need jointing filler to create mass for coating, to protect resistor wire from oxidation, and to provide heat transfer from wire to environment.
Also you will need small piece of tin to create mold.

After finishing it will take some day or two to dry