necessaryEvil from nowOn: HW

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2017-10-11

Arduino, DHT11 (Temperature, Humidity) & LCD indicator.

2017-06-05

Arduino, Vibration Sensor SW420

Example Code


int pin_LED   = 13;

int pin_EP    = 9;



void setup() {

    Serial.begin(9600);

    pinMode (pin_LED, OUTPUT);

    pinMode (pin_EP, INPUT); //set EP input for measurment

}



void loop() {

    long measurement = TP_init(); //Vibration sensor.

    delay(50); // default is 50

    Serial.print( "key U:" ); Serial.print( " [" );  Serial.print( measurement ); Serial.print( "] " );



    if (measurement > 500){

            digitalWrite(pin_LED, HIGH);

            Serial.print( "Vibration Level: Earthquake." );



    } else if (measurement > 100){

            digitalWrite(pin_LED, HIGH);

            Serial.print( "Vibration Level: Shake Tea." );

            digitalWrite(pin_LED, LOW);

    } else {

            digitalWrite(pin_LED, LOW);

            Serial.print( "Vibration Level: Very Quiet." );

    }

}



long TP_init(){

    delay(10); // default is 10

    long measurement=pulseIn (pin_EP, HIGH);  //wait for the pin to get HIGH and returns measurement

    return measurement;

}

2016-12-15

Arduino, RGB sensor TCS34725.

Required library Adafruit_TCS34725.
Turn Off embedded LED, wired TCS34725 of LED pin to Arduino of GND pin.

2016-11-24

Arduino, Light Sensor.


#include 



IRsend irsend;



void setup()

{

     Serial.begin(115200);

     pinMode (A0, INPUT);

     pinMode (13, OUTPUT);

}



void loop()

{

     while (Serial.available() == 0);



     int pr  = analogRead(A0);

     int val = Serial.read();



     if (val == 81) {

             irsend.sendNEC( 0x1067A857, 32 );

             Serial.println( "NeoSaid: Received Q." );



     } else if (val == 87) {

             irsend.sendNEC( 0x1067A857, 32 );

             Serial.println( "NeoSaid: Received W." );



     } else if (val == 69) {

             Serial.println(pr);



             if (pr > 700) {

                     Serial.println( "NeoSaid: Light Up." );

             } else {

                     Serial.println( "NeoSaid: Light Down." );

             }



             Serial.println( "NeoSaid: Received E." );

     } else {

             Serial.println( "NeoSaid: Nothing found!!!" );

     }



     //Serial.println(val);

}

2016-11-09

2016-11-01

Arduino, LED


int ledPin_Red = 12;

int ledPin_Green = 11;

int ledPin_Yellow = 10;



void setup()

{

  pinMode(ledPin_Red, OUTPUT);

  pinMode(ledPin_Green, OUTPUT);

  pinMode(ledPin_Yellow, OUTPUT);

}



void loop()

{

  digitalWrite(ledPin_Red, HIGH);

  delay(100);

  digitalWrite(ledPin_Green, HIGH);

  delay(100);

  digitalWrite(ledPin_Yellow, HIGH);

  delay(100);



  digitalWrite(ledPin_Red, LOW);

  delay(100);

  digitalWrite(ledPin_Green, LOW);

  delay(100);

  digitalWrite(ledPin_Yellow, LOW);

  delay(100);

}

2016-05-17

Copy IR signal through Audio Editor.

Audio wave editor: Audacity (freeware)

A. Record IR
Config: 選擇正確麥克風輸入 --> (Mono) Record --> 麥克風聲音調至最大 --> 採樣率拉高一點 (預設 384000 is OK).

B. 複製一段 IR signal 做為待會新的正弦波參考用.
Operation 1: 軌道 ==> 新增 ==> Mono track
Operation 2: 開啟新軌道後, 下拉左邊音訊軌道 ==> Format 32bits ==> Rate 76,000Hz

D. 新增軌道3, 複製軌道2過來, 選擇 "效果" ==> "倒轉" 產生一個波形與軌道2相反的正弦波.

E. 合併兩個軌道 (2&3)
Operation: 於軌道2, 選擇 "音訊軌道" ==> "製作立體聲軌道"

2016-03-17

LIRC, IR Transmitter [ irsend ]

Schematic (with Raspberry Pi)

(yellow, 3.5mm middle) PIN 17 [3.3V] ==> + IR LED - ==> [GND] PIN 06 (black, 3.5mm peak)

# irsend SEND_ONCE SHM38K KEY_OK


IRSEND OPTION

-- Help

-h --help display usage summary

-v --version display version

-d --device use given lircd socket [/var/run/lirc/lircd]

-a --address host[:port] connect to lircd at this address

-# --count n send command n times



-- DIRECTIVE can be:

SEND_ONCE - send CODE [CODE...] once

SEND_START - start repeating [CODE]

SEND_STOP - stop repeating [CODE]

LIST - list configured remote items

SET_TRANSMITTERS - set transmitters NUM [NUM...]

SIMULATE - simulate IR event