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car sensors !!
obd2 !!
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My conclusion from the speed bump post was that the built-in accelerometer in the Android phone is probably not enough to detect the obstacle. Alexander Kosenkov commented that maybe the accelerometer vector can be processed in a more sophisticated way but my experience is that the car generates such an amount of vibrations that makes extracting relatively faint signals from the accelerometer rather hard if not impossible.
While I was contemplating on this issue, I got a mail from Edward Pultar, president of Valarm, a start-up based in Los Angeles. These guys created an Android application and associated web services that started as a theft-prevention tool and is being repositioned as a general platform for all sorts of sensor data acquisition and processing. Read their press kit about the exact features of their products.
The most fascinating idea in their product is the use of OBD2 interface to connect to the car's own sensors. OBD2 with a Bluetooth plug is widely used by car fanatics to obtain diagnostic data including speedometer, tachometer, engine temperature, on-board GPS (if the car is equipped with it) and many other sensors. Valarm's idea was to use this wealth of data for use cases other than car diagnostics, e.g. monitoring whether the car is driven recklessly. They do sensor fusion with the car sensors and with the phone's own sensors. For example cars don't normally have accelerometers that can detect excessive vehicle vibration caused by bumpy roads or faulty tires but a smartphone has. The phone is also equipped with a wealth of communication options, large memory and is an application platform. It is therefore an ideal device to aggregate data from different sensors (internal and external) and to send the data to web services.
This may sound like a futuristic research paper but to my utter surprise, even my own car which is well in its teenager years has the OBD2 interface. All I need is a commercially available Bluetooth plug (connection by cable is also possible but is less practical) and the car will talk to my Android phone. This makes Alexander's idea about incorporating the speed profile for the speed bump detection pretty easy to implement.
While I was contemplating on this issue, I got a mail from Edward Pultar, president of Valarm, a start-up based in Los Angeles. These guys created an Android application and associated web services that started as a theft-prevention tool and is being repositioned as a general platform for all sorts of sensor data acquisition and processing. Read their press kit about the exact features of their products.
The most fascinating idea in their product is the use of OBD2 interface to connect to the car's own sensors. OBD2 with a Bluetooth plug is widely used by car fanatics to obtain diagnostic data including speedometer, tachometer, engine temperature, on-board GPS (if the car is equipped with it) and many other sensors. Valarm's idea was to use this wealth of data for use cases other than car diagnostics, e.g. monitoring whether the car is driven recklessly. They do sensor fusion with the car sensors and with the phone's own sensors. For example cars don't normally have accelerometers that can detect excessive vehicle vibration caused by bumpy roads or faulty tires but a smartphone has. The phone is also equipped with a wealth of communication options, large memory and is an application platform. It is therefore an ideal device to aggregate data from different sensors (internal and external) and to send the data to web services.
This may sound like a futuristic research paper but to my utter surprise, even my own car which is well in its teenager years has the OBD2 interface. All I need is a commercially available Bluetooth plug (connection by cable is also possible but is less practical) and the car will talk to my Android phone. This makes Alexander's idea about incorporating the speed profile for the speed bump detection pretty easy to implement.
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