![\"Arduino](\"https:\/\/static.knackes.com\/images\/7D\/2014\/2014-03-22-ShakeMotion\/ShakeMotion.jpg\" "\\"Arduino")
<\/a>My car powers the cigarette lighter even when the keys are removed, Which – very slowly – drained the batteries when gadgets where left connected to it. One option would be to open the dashboard to connect a second outlet to the right cable on the car radio, but that would be too easy.The basic Idea was to use an ADXL362 accelerometer<\/a> to know if the vehicle was moving in the last 10 minutes or turn the output off. I first wanted to use the ADXL362’s internal motion activation mechanism, but failed to get the result I wanted, so I resorted to a purely software alternative ruining on the Arduino Pro Mini<\/a>. For this I forked the effort of driving the accelerometer started by Anne Mahaffrey<\/a> to my own, freshly created GitHub repository<\/a>.\u00a0Finally glue everything together with a small arduino sketch : ADXL362_Acc_LED_2_1.zip<\/a>.<\/p>\nHere is a schema from the circuit (done in Fritzing) : and here is my Bill Of Material :<\/p>\n I just added a 12V-to-USB power board to directly feed an USB powered gadget to the\u00a0back side of the box, and it’s finished.<\/p>\n There is much room for improvement : use low power modes on the Arduino, use the built-in motion sensor mode of the ADXL362, use a less power-hungry solution than a LM7805, tailor all my protection components for the same nominal current, but for the moment, it works.<\/p>\n","protected":false},"excerpt":{"rendered":" Second english post to document my Arduino + ADXL362 Motion activated 12V switch. My car powers the cigarette lighter even when the keys are removed, Which – very slowly – drained the batteries when gadgets where left connected to it. … Continuer la lecture
\n![\"Arduino](\"https:\/\/static.knackes.com\/images\/7D\/2014\/2014-03-22-ShakeMotion\/Schema-Small.png\" "\\"Arduino")
<\/a>Schema file in Fritzing format : ShakeMotion_2.fzz<\/a> (the ADXL is not the right one)<\/p>\n\n