|Version 15 (modified by 11 years ago) ( diff ),|
Audio Jack modem for Iphone and Android
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 )
- 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.
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
GND → GND
VCC → VCC
FSKIN → D6
AIN1 → D7
Measure the voltage on AIN1 with tester to make it (VCC / 2) + 300mV.
5V VCC: 2.7V AIN1
3.3V VCC: 1.95V AIN1