第一回 冬のスイッチ大勉強会 - XBee編 -

1. Switch_lecture
ArduinoMicro + XBee + SerialCommunication

2. とりあえず加速度。
ArduinoMicro
5V
GND
A0
A1
A2
1: Vdd
2: PSD
3: GND
5: SelfTest
6: Out X
7: Out Y
8: Out Z
KXM52-1050

3. Arduino sketch
BAUD_RATE : 9600
Device ID
Read analog values
Print to serial
“id,x,y,z” + ‘n’
int id = 0;
void setup()
{
Serial.begin( 9600 );
}
void loop()
{
int x = analogRead( A0 );
int y = analogRead( A1 );
int z = analogRead( A2 );
Serial.print( id );
Serial.print( "," );
Serial.print( x );
Serial.print( "," );
Serial.print( y );
Serial.print( "," );
Serial.print( z );
Serial.println();
delay( 100 );
}

4. Baud Rate
ボーレート
ボー
baud = 変調回数
9600bps = 1200Bps
9600bps = 1200 Character per sec
1Byte = 8bit = 1character( ASCII )
厳密には = bps ではない

5. AT Command
ATID : Network ID
ATCH : Channel
ATMY : My Address
ATDL : Send Address
ATBD : Baud Rate
ATWR : Write Settings
える

6. Communication
1 x 1
MY: 1
DL: 0
MY: 2
DL: 0
MY: 0
DL: -
MY: 1
DL: 0
Sender Receiver
MY: 0
DL: -
→
→
2~ x 1
→
Sender Receiver

7. Add XBee
ArduinoMicro
3V
RX
TX
GND
3.3V
DOUT
DIN
GND
XBee
Transmit→
書き込み時は外す
Receive←
→
←

8. Arduino sketch
( ArduinoMicro + XBee )
Serial → Serial1
Serial → Serial1
int id = 0;
void setup()
{
Serial1.begin( 9600 );
}
void loop()
{
int x = analogRead( A0 );
int y = analogRead( A1 );
int z = analogRead( A2 );
Serial1.print( id );
Serial1.print( "," );
Serial1.print( x );
Serial1.print( "," );
Serial1.print( y );
Serial1.print( "," );
Serial1.print( z );
Serial1.println();
delay( 100 );
}

9. Read Serial
( openFrameworks )
ofApp.h ofApp.cpp
class ofApp : public ofBaseApp
{
public:
ofSerial serial;
string str;
int index, x, y, z;
};
void ofApp::setup()
{
index = x = y = z = 0;
str = "";
serial.listDevices();
serial.setup( 0, 9600 );
ofBackground( 255 );
}
void ofApp::update()
{
while( true )
{
int c = serial.readByte();
if( c == OF_SERIAL_NO_DATA || c == OF_SERIAL_ERROR || c == 0 )
{
break;
}
if( c == ‘n’ )
{
vector< string > valStr = ofSplitString( str, "," );
if( valStr.size() == 4 )
{
index = ofToInt( valStr.at( 0 ) );
x = ofToInt( valStr.at( 1 ) );
y = ofToInt( valStr.at( 2 ) );
z = ofToInt( valStr.at( 3 ) );
}
str = "";
}
else
{
str.push_back( c );
}
}
}

10. Flow Chart
false
read 1 character
false
true
true
int c = serial.readByte()
c == OF_SERIAL_NO_DATA
or
c == OF_SERIAL_ERROR
or
c == 0
while( true )
break str.push_back( c )
c == ‘n’
ofSplitString( str, "," )
str = ""
index = ofToInt( valStr.at( 0 ) )
x = ofToInt( valStr.at( 1 ) )
y = ofToInt( valStr.at( 2 ) )
z = ofToInt( valStr.at( 3 ) )

11. Get values from string
“0,524,535,751”
convert to int from string
index = ofToInt( valStr.at( 0 ) )
x = ofToInt( valStr.at( 1 ) )
y = ofToInt( valStr.at( 2 ) )
z = ofToInt( valStr.at( 3 ) )
“0” “524” “535” “751”
id
string
string
x y z
string
int
vector< string > valStr = ofSplitString( str, "," )

12. Draw with sensor value
x = 0 ~ 1023
( float )x / 1023 = 0.0 ~ 1.0
( ( float )x / 1023 ) * ofGetWidth() = 0.0 ~ ofGetWidth()
( openFrameworks )
necessary to re-scale values
ofApp.cpp
void ofApp::draw()
{
ofSetColor( 0 );
ofFill();
ofRect( 0, 0, ( ( float )x / 1023 ) * ofGetWidth(), 60 );
}