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Fall Detection Algorithm based on ST LSM303
Diff: main.cpp
- Revision:
- 0:c355c42bd6de
- Child:
- 1:474dc40b688a
diff -r 000000000000 -r c355c42bd6de main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Thu Aug 23 18:11:16 2018 +0000 @@ -0,0 +1,83 @@ +#include "mbed.h" +#include "LSM303DLHC.h" + + +DigitalOut led1(LED1); +DigitalOut led2 (LED2); + + +float aax, aay, aaz, mmx, mmy, mmz, aaz_old; +bool retval; +EventQueue queue; +InterruptIn free_fall(P5_1); // Free Fall Interupt asserted on pin 5_1 + +LSM303DLHC sensor(P3_4, P3_5); //Initialise LMS303 + +/** Function to calculate Impact Acceleration after a Free Fall Interrupt has been Asserted **/ +void ff_proc() +{ +double atotal; +double TH=4; +printf("Free Fall Interupt Asserted ..... \n"); +retval=sensor.read(&aax, &aay, &aaz, &mmx, &mmy, &mmz); +atotal=sqrt(pow(aax,2)+pow(aay,2)+pow(aaz,2)); +printf("Total Acceleration %f\n", atotal); +if (atotal<TH) //Fall NOT verified +{ + led2=0; + led1=1; + } + +} + +/** Free Fall Interrupt Service **/ +void ff() +{ +// Potential Fall detected + led2=1; + led1=0; + + queue.call(&ff_proc); //Calculate Impact Acceleration and any other thresholds to verify Free Fall Event +} + + + +//*******************************************************************************// + +// main() + int main() { + +int flag=1; +Thread eventThread; + + led1=1; // LED1 OFF + led2=1; // LED2 OFF + + eventThread.start(callback(&queue, &EventQueue::dispatch_forever)); + + led2=0; + printf("Initialising LSM303DLHC ..... \n"); + + retval=sensor.read(&aax, &aay, &aaz, &mmx, &mmy, &mmz); + if (retval==1) + { + printf("Success: LSM303DLHC Connected, Accel Values: %3.2f%3.2f%3.2f\n", aax, aay, aaz); + + + + } + else { + printf("Failure : LSM303DLHC NOT RESPONDING................... \n"); + flag=0; + } + +if (flag) { + +free_fall.fall(&ff); + +while(1) +{ +} + +} +} \ No newline at end of file