= Audio Jack modem for Iphone and Android = === ARMS22-SOFTMODEM SMD === With this board, datas are transferred from Arduino to iPhone and from iPhone to Arduino. The communication speed is 1225bps (※ The actual data transfer rate slightly lower.) It is suitable for a small amount of data communication like switch inputs and sensor information. This is semi-finished products. To use this, solder a pin header or a pin socket to this board. Dimensions: 33 x 18mm ( without audio jack ) == Applications == [http://side2.256byte.com/2010/08/android-softmodem/ Android with this board] [http://side2.256byte.com/application/softmodem-terminal/ Softmodem Terminal application for Android] [http://side2.256byte.com/2010/09/android-shutter-control/ Android to control the camera shutter in a SLR] [http://d.hatena.ne.jp/NeoCat/20100822/1282486171 Make voice audio with JavaScript and play it as a way of data communication] [http://mkroll.mobi/hardware/rfid_tag_reader/rfid_tag_reader.html iPhone RFID Tag Reader] == Disclaimer == * Because data communications with this device uses audio, data corruption may occur sometimes. Please consider incorporating the checksum processing, and retrying. * Please make the iPhone's volume maximum. == Connection == Use a 4 pin male to male cable to connect to iPhone. With some cable, cross-talk may occurs that cause communication errors. Please use the gold plated shielded cables. The shorter the cable, the better. Connect to Arduino as follows (right side is the Arduino's pin.) FSKOUT → D3[[BR]] GND → GND[[BR]] VCC → VCC[[BR]] FSKIN → D6[[BR]] AIN1 → D7[[BR]] == Volume Adjustment == Measure the voltage on AIN1 with tester to make it (VCC / 2) + 300mV. 5V VCC: 2.7V AIN1[[BR]] 3.3V VCC: 1.95V AIN1[[BR]] == Arduino Library: !SoftModem == [http://code.google.com/p/arms22/downloads/detail?name=SoftModem-004.zip SoftModem-004.zip] === Sample Sketch ===