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Friday, 20 March 2015

The IDEA is before you able to develop bigger network you may try to use small device.

Here at home, I have 2 wireless router that have capabilites such dynamic routing, nat, firewall, and bandwidth.

1 router is connected to the internet, other not directly connected to the internet;

Warning: TP-Link only support 1 network address per cable and wireless.

So we only have chance to build 2 network address on our network.

Task you need to do to accomplish are:
0. Setup wireless setting
1. Bridging 2 wireless SSID
2. Configure and use dynamic routing of both routing so host can communicate
3.

To configure dynamic routing, you need data:
1.
2.

2. Bridging 2 wireless SSID
To configure bridging, you need data:

3. Access restriction
To restrict an access you need:
1.
2.
3.

4. To limit the bandwidth
- Out of router 2 router 1, you need data:

5. To NAT certain address you need a data:
1. What address

6. To setting Firewall you need data:
- Are you use SPI

Javascript application are:
1. Database-driven application
2. Animated 2D and 3D graphics
3. Create games
4. Make things happen when you click a button
5. Image galeries
6.

Start 1: Hello World
1. Create a folder call it "scripts"
2. Then outside that folder create main.js and index.html
3.

Thursday, 19 March 2015

Apa saja sih yang bisa dibangun dengan javascript:

Javascript bisa apa saja?

1. Javascript bisa mengubah isi dari html

Misalnya:

document.getElementById("demo").innerHTML = "Hello JavaScript";

2. Javascript bisa mengubah atribut / properti html

Misalnya:

3. Javascript bisa memvalidasi data. Contoh sebagai berikut:

<!DOCTYPE html>

<html>

<body>

<h1>JavaScript Can Validate Input</h1>

<p>Please input a number between 1 and 10:</p>

<button type="button" onclick="myFunction()">Submit</button>

function myFunction() {

var x, text;

// Get the value of the input field with id="numb"

x = document.getElementById("numb").value;

// If x is Not a Number or less than one or greater than 10

if (isNaN(x) || x < 1 || x > 10) {

text = "Input not valid";

} else {

text = "Input OK";

}

document.getElementById("demo").innerHTML = text;

}

</script>

</body>

</html>

Transistor Lab #2 : Counter circuit

Counting in binary is sophisticated technique hardly to figures; but I finally understand but I almost go insane, that is how transistor used to do arithmatic add between 2 bits together.

At first sight you will really hardly found the key concept. I am in electronics for 5 years, but I finally understand the key in my last year.

The hardest part of binary arithmatic (specially adding together bits) are the carry concept / mechanism.

We can just do binary arithmatic using XOR operation, but when we add 1 + 1 the result shoud be 2, but binary limited the output into 0, 1. There is no number 2. This I confuse about.

But, after reading a lots of tutorial I know now that the carry mechanism it self is using another designated circuit. So there are 2 circuit in arithmatic adder.

The carry circuit was OR circuit and the add circuit is XOR operation. So the total is 2 circuits but supplied with same two A and B input. And the output must be 2. So counting in binary need 2 output, in this case 2 LEDs.

Lets build it

First build an XOR circuit and then built the OR circuit and then connect the A, and B input and then connect the 1 LED to XOR circuit and another LED to OR circuit.

HOW can computer count binary

1. We need to know how computer add 1 bit binary

A	B	Out
0	0

Transistor labs: Electronic Gates

Forget about that silly litle thing. We do this begin with simple thing: "connect this and that".
We will try to build this:
1. Not gate
2. AND gates
3. OR gates
4. NAND gate
5. NOR gate

Di lab ini juga kamu akan mengetahui apa hubungan antara transistor dengan chip-chip IC dan ngapain kamu beli/nyari chip IC di toko Glodok elektronika sewaktu ingin membuat rangkaian elektronika.

Sebagai pemanasan kamu bisa menonton video berikut:

Oke?

Start:
1. A Not Gate
transistor not gate

Rangkaian not gate ini gampang dibuat. Cuma membutuhkan sebuah transistor. Letakkan out sebelum transistor atau dengan kata lain pada kaki collector dan amati out jika A diberi tegangan dan tidak diberi tegangan.

Letakkan a pada basis. Hubungkan kaki emitter pada ground.

2. An AND gate

2-input transistor and gate

Rangkaian AND gate ini gampang dibuat.

3. An OR gates
2-input transistor or gate

Yang paling rumit memang yang bagian tengah diagram. Tapi, kalau berhati-hati kita berhasil membuat rangkaian tersebut diatas breadboard kita.

1 lingkaran = 1 transistor. Jadi rangkaian terdiri dari 2 lingkaran, jadi jumlah transistor yang dibutuhkan = 2 transistor.

4. An XOR gate

exclusive-or gate equivalent

Can you define how many transistor we need to build just an XOR gate based on above?
Answer:
2 for the OR gate, 2 for the AND gate, 2 for the last NAND gate. So the total is 2+2+2 = 6 transistors.

Because its need many transistors or too complex to build, then our ancestor has think about this and introduce us to use an IC (integrated circuit); too fasten human to build such gate.

They produce IC since 1970s. Also, because they know that computers will need lots of this gates to build.

4. NAND gates
2-input transistor nand gate

Apa perbedaan dalam rangkaian AND gate dan NAND gate?
>> Simple, output dikeataskan (NAND) atau dikebawahkan (AND) atau dengan kata lain, output sebelum transistor (AND) atau sesudah transistor (NAND).

5. NOR gate
2-input transistor nor gate

Apa perbedaan dalam rangkaian OR gate dan NOR gate?
>> Simple, output dikeataskan atau dikebawahkan.

Kesimpulan :
1. Gate-gate yang tersedia and, not, or, xor, nand, nor, x-nor.
2. Untuk mengimplementasi gerbang logika juga dapat menggunakan/membeli chip IC.
3. Untuk membuat gerbang logika juga bisa dengan menggunakan switch/saklar.

Next:
1. Bagaimana membuat computer yang bisa menambah / mengaritmatika angka / number?
2. Bagaimana kalau kita membuat permainan berdasarkan transistor?

QUIZ

1. Coba hitung ada berapa gate di dalam IC kita dibawah ini; IC ini bernama/bermerek dagang: "7408 Quad 2-input AND-Gate":

7408 Quad 2-input AND Gate

Yup, jawabannya 4 buah gate berjenis AND. Yup lagi, jika kamu membeli IC ini di toko elektronik apek-apek cina kamu bisa membuat 4 buah gerbang and dengan hanya 1 buah IC ini. Dibandingkan jika menggunakan

2. Coba hitung ada berapa gate OR di dalam chip IC ini; IC ini bernama/bermerek dagang: "7432 Quad 2-Input Logic OR gate"

7432 logic or gate

Yup sama, chip ini terdapat empat gate OR.

3. Coba hutung ada berapa gate NOR di dalam IC ini; IC ini bernama/bermerek dagang: "

7402 logic nor gate

Yup, sama chip ini terdapat empat gate NOR.

Wednesday, 18 March 2015

Electronics: Measurement

1. How to calculate the voltage accross
Principe: To calculate the voltage, the multimeter must be in paralel to what it want to measure.

2. How to calculate the current through an
Principle: To calculate the current, the multimeter must be in serial to what it want to measure.