Free fall with ADXL345 accelerometer

Other Hardware Sensors
1

Hello,

I want to be able to turn on an LED when the accelerometer detects free fall. I found :

http://www.varesano.net/blog/fabio/exploring-advanced-features-adxl345-accelerometer-single-double-tap-activity-inactivity-f

I was able to do what Fabio showed in his video. I get free fall readings, now i want to turn on an LED when free fall is detected. I am new to electronics and will greatly appreciate your help. Unfortunately Fabio passed away last year, i found his website too late.

"This is my current wiring:
CS tied to Vcc. Also, I'd lower those pullups to 2K2.
ADXL Arduino
gnd > gnd
gnd > sd0
scl > a5
sda > a4
int1 > d2

resistors between vcc & scl & sda."

2

The Blink example shows you how to turn the built-in light on and off.

3

IIRC this device can signal the freefall condition via an interrupt. You need to detect this interrupt. You need to read one of the many basic arduino tutorials which explain how interrupts work.

You probably also need to carefully read and understand the process for setting up the device so that the free-fall condition will generate the interrupt.