Interfacing with Arduino

Interfacing with Arduino

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  Omer Kilic |[email protected]
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  Interfacing?AB
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  Standard Computer InterfacesWiredUSBSerialPortParallel PortFirewireEthernetAnd others…Wireless
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  WiFi
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  Bluetooth
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  IrDA‘Embedded’ InterfacesSPII2C1-WireUNI/OAnd others…
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  RS232 – TheSerial PortAsynchronous serial communications protocolNo clock is sent - the receiver must provide the clock signalData rate must be known by transmitter and receiverArduino implements a ‘virtual’ serial port via USBhttp://arduino.cc/en/Reference/Serial
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  Voltage LevelsDifferent devicesmay have different voltage levelsExample: RS232Voltage levels specified as +12/-12 volts in the standardHooking these levels up to the micro will FRY it!Solution: Use a level converter
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  RS232 Level Converter
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  Virtual COM PortsSerialport via USBApplications think they are talking to a serial port, which is emulated by the driversNo need to have a physical serial port!Most new machines don’t have them anywayA LogicalChoice(tm) !
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  Example Project: ThermometerAtemperature sensor is connected to an analog input on the ArduinoArduino periodically reports the temperature back to PCPC uses this data to plot graphs etc.
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  It’s an analogworld…Digital – only has two values: on/offAnalog – has many (infinite) valuesComputers don’t really do analogSo they fake it, with quantizationFrom Tod E. Kurt’s ‘Spooky Projects’ notes - http://todbot.com/blog/spookyarduino/
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  Thermometer: Arduino CodeintsensorPin= 0; // the analog pin that the sensor is connected tovoid setup(){Serial.begin(9600);}void loop(){//getting the voltage reading from the temperature sensorint reading = analogRead(sensorPin); // converting that reading to voltage, for 3.3v arduino use 3.3float voltage = reading * 5.0 / 1024; // print out the voltageSerial.print(voltage); Serial.println(" volts");// now print out the temperaturefloattemperatureC = (voltage - 0.5) * 100; // converting from 10 mV per degree with 500 mV offset // to degrees ((voltage - 500mV) times 100)Serial.print(temperatureC); Serial.println(" degress C");delay(1000); // wait a second}From Ladyada’s TMP36 Tutorial - http://www.ladyada.net/learn/sensors/tmp36.html
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  Thermometer: PC SideReadthe incoming data every X seconds (cron)Collect and plot temperature graphs (rrdtool)Example: thermostat-graphhttp://www.anders.com/projects/thermostat-graph/Not an Arduino project but easily hackable!
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  Example Project: OrangeMessenger(demo)
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  Thank you forlistening Any questions?Further questions/comments to [email protected] please…