Nugroho's blog.

Wednesday, April 15, 2015

Fritzing, One Stop Apps for MicroController

We could write code in it, connecting parts on breadboard (or project-board), auto-route it to schematic and pcb layout (single or double layer).

It has several arduino board ready on parts section

Dengan Fritzing, kita bisa menulis kode mikrocontroler di sini, memasang komponen dan menyambung dengan kabel di project-board, kemudian me-route secara otomatis menjadi skematik seperti di EWB (Electronic Work Bench), routing otomahis juga dilakukan untuk menghasilkan layout PCB seperti di Protel (mendukung single dan double-layer)

Saturday, April 11, 2015

Blink Without Delay Problem on Arduino

Well, not for all, but for me it becomes problem while turning led on using analogWrite command, some led just won’t completely shut down.

(Maybe it completely unrelated, but my analog reading on A0 is oscillating, very unstable)

I have the commands packed on a function

unsigned long t0 = 0;
const long dt = 1000;       
void blinkNoD(int pin) {
  unsigned long t = millis();
  if(t - t0 >= dt) {
    t0 = t;
    led=!led;   
    digitalWrite(pin, led);
  }
}

Since I already have delay in loop, and it really messed with the timing (not mention that maybe the analog reading instability have anything to do with it), I decided to modify the blink code, still without delay command.

unsigned long t0 = 0;
const long dt = 1;       
void blinkNoD(int pin) {
  t0 += dt
  if(t0 >= 4) {
    t0 = 0;
    led=!led;   
    digitalWrite(pin, led);
  }
}

It turned out that my analogRead instability is another problem, get to work on it, :)

Friday, April 10, 2015

Move Object using ActionScript on Flash

Thursday, April 9, 2015

Sensor Analog di Arduino, dengan monitor via bluetooth

KProgram ini digunakan untuk melihat nilai sensor (berupa tegangan) di port analog 0 (A0) di ATMega328.

Di sini sensor diwakili oleh potensiometer yang kaki tepinya masing-masing dihubungkan ke vcc dan ground, kaki tengah dihubungkan ke port analog 0.

Microcontroler membaca port analog 0 yang nilainya kemudian dikirimkan secara serial via bluetooth, juga untuk menyalakan empat led sesuai dengan nilai pembacaan sensor.

Karena ATMega328 memliliki resolusi pembacaan analog sebesar 10-bit, maka led diset sedemikian sehingga led 1 menyala jika nilai kurang dari 255, led 1 dan 2 menyala jika nilai sensor antara 255 dan 512, dst.

Sebagai tambahan, perintah yang digunakan untuk menyalakan led adalah analogWrite() bukan digitalWrite() sehingga meski nilai sensor kurang dari 255, kita masih bisa membedakan levelnya dengan tingkat redup-terangnya led pertama (0 mati, 50 redup, 255 nyala terang).

I also use it to blink led without delay, fade without delay, write to serial via Bluetooth module (HC-05) AND USB-to-TTL.

Notice that I have two TX and two RX, the default pin (0 and 1) for usb communication (upload sketch and debugging), the software serial TX,RX (pin 8 and 7) is used for bluetooth communication.

Here the code. I use some function to isolate some group of commands for easy debugging.

#include <softwareserial .h>

SoftwareSerial mySerial(8, 7); // RX, TX

int led = LOW;        
int dterang = 5;
int terang = 11;
unsigned long t0 = 0;
const long dt = 1000;       

void setup() {
  setupSerial();
  pinMode(13, OUTPUT);
 
}

void loop() {
  fadeLed(5);
  blinkNoD(13);
  adcToLed(0);
  bacaAnalog(0);
  delay(100);
}

void adcToLed(int pin){//3,9,10,11
  int nilai = analogRead(pin);
  int sisa = nilai % 256;
  if (nilai<256 data-blogger-escaped--1="" data-blogger-escaped-512="" data-blogger-escaped-768="" data-blogger-escaped-analogwrite="" data-blogger-escaped-dterang="" data-blogger-escaped-else="" data-blogger-escaped-fadeled="" data-blogger-escaped-if="" data-blogger-escaped-int="" data-blogger-escaped-nilai="" data-blogger-escaped-pin="" data-blogger-escaped-sisa="" data-blogger-escaped-terang="" data-blogger-escaped-void="">=255 ){
    terang = 255;
    dterang *= -1;
  }
  analogWrite(pin, terang);
}

void blinkNoD(int pin) {
  unsigned long t = millis();
  if(t - t0 >= dt) {
    t0 = t;
    led=!led;   
    digitalWrite(pin, led);
  }
} 

void bacaAnalog(int pin) {
  int sensor = analogRead(pin);
  mySerial.print("Pin ");
  mySerial.print(pin);
  mySerial.print(" bernilai ");
  mySerial.println(sensor);
  Serial.println("Output dilewatkan port serial via bluetooth");
  delay(10);    
}

void setupSerial(){
  Serial.begin(9600);
  Serial.println("Hello, world? Ini kabel");
  mySerial.begin(9600);
  mySerial.println("Hello, world? Ini bluetooth");
}
/*
PWM: 3, 5, 6, 9, 10, and 11. 
PI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK)
Serial: 0 (RX) and 1 (TX)
*/

Monday, April 6, 2015

Arduino with HC05 Bluetooth Module on OS X Yosemite

Got HC05 Bluetooth Module last Saturday at electronic store, connect it with my Arduino Pro Mini (ATMega 328 based) the usual way: tx—rx, rx—tx, vcc—5v and ground—0v. Powered it on alongside the Pro Mini. The led indicator blinked, good sign, :)

Pairing with my Mac is easy, but make sure the pairing code is 1234, mac use 0000 as default code. If paired successfully the led blink pattern will change.

Open the serial monitor and, nothing appeared, :(

Maybe the IDE busy so I open the OS X terminal and access using screen:

$screen /dev/cu.HC-05-DevB

Still nothing happened.

Unplug all the cable, plug it again. And yup, there’s serial output (using Arduino IDE serial monitor or screen command on terminal )

I have a Mac with Yosemite.

Apparently, most of my problem with arduino board is loose cable connection, :)

Saturday, April 4, 2015

Arduino Pro Mini (ATMega 328 Based), my New Toy

I saw it at electronic part shop while shopping for my DIY guitar preamp part. It based in ATMega 328 and it waking up my years-sleeping microcontroller spirit :D

I always love assembly language, I have several project on ATMega based microcontroller as programmer but it's just that. I just love programming without bothered by hardware, minsys or whatnot.

It's true that arduino language is not asm; it's simplified C. But it come in package, I just have to program it and it'll work. It's the closest thing I got to hardware related interface, for now (I still have a plan that some day I'll master both microcontroller hardware and software interfacing :) )

Anyway, I bought this Arduino Pro Mini and an USB to TTL module.

It just my luck that I bought that PL2303HX module and not Sparkfun breakout board or FTDI connector as my Arduino Pro Mini layout is totally different; it has same dimension as original but the hole for pins is different (it has more hole than the original). The breakout board probably won't match and maybe useless (I don't konw about FTDI). So I think the pl2303hx usb to ttl usb-stc-isp is my best shot.

My luck, or probably not, it means my Arduino Pro mini is the clone, :)

I download Arduino IDE for my MacBook Air with OS X Yosemite.

Install it, there's no problem as I changed my macbook setting on software installer permission (set to ANY)

Ran the IDE, use the example code, blinking LED.

compile it, OK

Upload it, this error message appear:

Arduino: 1.6.2 (Mac OS X), Board: "Arduino Pro or Pro Mini, ATmega328 (5V, 16 MHz)"

Sketch uses 1,068 bytes (3%) of program storage space. Maximum is 30,720 bytes.

Global variables use 11 bytes (0%) of dynamic memory, leaving 2,037 bytes for local variables. Maximum is 2,048 bytes.