Replace water inlet valve for Samsung washing machine

This is a step to check whether your water inlet valve is function or not. Firstly, open the back cover that place the valve. It is double water inlet type that flow the water simultaneously to the washing machine. Take multimeter and touch at both connectors in each valve. The values will be increased and slowly reduce instead of static to 1 if it still function and vice versa. Even, either one of that valve is not function, then it needs to replace. 

    

Bring that valve to the spare-part shop, ask double inlet valve, double check the diameter size of inlet is matching or not, then replace at your washing machine. Turn on the power, and DONE!!!

Wireless Motion Device (IMU)

The smallest motion device was designed to help people monitor any movement, which can be attached to the body, machine, sports equipment and many more. It equipped with microcontroller (Atmega328), bluetooth HC-05, accelerometer MPU, small battery, and charging port. 

It had two sides of surface mount circuit, with low power management circuit. Suitable for wearable device prototyping, and for portable monitoring device. This is first version and need more improvement later. 

How to develop a simple pressure sensor?

The main material is velostat

and two conductive materials to make it like sandwich

This is capacitance concept

Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential. 

Pressure sensor video

How to setup ESP32 in Arduino IDE?

Open Arduino IDE

Select Preferences or shortcut (control + , ) / (command + , )

Copy and paste this url address into add board url

https://dl.espressif.com/dl/package_esp32_index.json
Then, open board manager, search esp32 and install
Wait until download is finish...Done

Alternatively, open this url
https://github.com/espressif/arduino-esp32
Clone zip.file into your computer
Upload to Arduino IDE...Done

Parcel from JLCPCB

Just got parcel from JLCPCB, excited to look the final product since this is my first time order with them. When unboxing, it is amazing with the quality was superb. Can't get the same product with the lowest price such as from here.

With 10pcs PCB it cost about $2 only and free shipping for the first order. I recommended to all makers outside there to use this company services. Thumbs up. 👍🏻

Thank you JLCPCB for a great service !!!

Schematic to upload code for Arduino using Bluetooth HC-05

STATE from HC-05

RESET from Arduino board

When applied this schematic into your design, no need usb cable anymore to upload code from computer. Just pairing HC-05 with your computer and select the right port then UPLOAD.

Done!!!

How to design your PCB in online software?

This is my first designed using easyeda.com online software

The interesting of this software are:

1. Free software

2. Components updated

3. Can copy from others user and share your design

4. Integrated with JLCPCB company for PCB manufacturing

5. Can view in 3D in 360 degrees

6. Since this is online, can view and edit from any computer.

7. Enjoy it 😄

How to fabricate your own PCB

There are steps to develop and fabricate your own PCB

1. Design your circuit from easyeda.com or any circuit design software (Eagle, Kicad, Altium etc)

2. Print the circuit on the transferred paper using laser printer HP

3. Apply heat on that paper to transfer ink onto the PCB copper

4. Etching (step 3) into ferric chloride (acid) for 10 minutes

5. Take out and clean up ink with thinner

6. Drill the hole with micro drill

7. Solder all components followed the schematic diagram that designed at first

8. Testing and DONE.

Figure below shows the comparison between first orientation of components (left) and new (right). The improvements are on the size minimised and reduced about 30%.

How to setup HC-05

Enter AT Command Mode

Open Serial Monitor

Type AT ---> OK

AT+ROLE = 1   [0 (slave) / 1 (master)]

AT+ADDR?

AT+UART=57600,0,0

AT+NAME=zultronics

AT+PSWD=1234