I have an external sensor (personal, mobile). For example, a thermometer. I'd like to connect it to an ordinary mobile phone (no OS, just JavaME) and write JavaME application which reads data from that sensor and displays them on the screen.
My understanding was that I could connect sensor to phone using the audio jack (headphone jack), because every phone has that jack. But I didn't find any info how to read data through that jack.
So, my questions are:
1) Is it possible to connect an external sensor to phone's headphone jack and read data from it in JavaME application? How? Code example?
2) What are the other ways to connect an external sensor to JavaME phone? Bluetooth? Sms?
Thanks for your help!