Vehicle remote ignition - Some questions.
hi there everyone, i'm new here can see 
firstly little bit me, i'm 21 , i'm apprentice in electronics.
i purchased arduino uno r3 last week , have been having fun it, , came project idea.
my idea able remotely start car via text message, can warm before getting in it.
whilst reading this, remember car old , has no immobilisation/alarm (which makes easy)
i've gotton far being able start car via web arduino hooked laptop via usb whilst laptop connected home wifi, , running php script can access via phone on same network.
the way relays connected before key barrel, i've spliced accessories, on, ignition , earth wires , put relays between. <kind of primitive guess.
i'm sure can work around cell part of project once cell shield, have 1 small issue.
once you've warmed car , have gotton in it, naturally need put key in , turn on position release steering lock, fine.
but once this, need arduino turn off/release relays when turn car off via key, car shuts down.
it's simple fix, cannot work out how it.
the other way give arduino say, 10 minute delay, release relays (hopeing have key in) i'd rather not that.
if shed light on this, appreciated!
i wish make comprehensive tutorial on how once i'm finished
firstly little bit me, i'm 21 , i'm apprentice in electronics.
i purchased arduino uno r3 last week , have been having fun it, , came project idea.
my idea able remotely start car via text message, can warm before getting in it.
whilst reading this, remember car old , has no immobilisation/alarm (which makes easy)
i've gotton far being able start car via web arduino hooked laptop via usb whilst laptop connected home wifi, , running php script can access via phone on same network.
the way relays connected before key barrel, i've spliced accessories, on, ignition , earth wires , put relays between. <kind of primitive guess.
i'm sure can work around cell part of project once cell shield, have 1 small issue.
once you've warmed car , have gotton in it, naturally need put key in , turn on position release steering lock, fine.
but once this, need arduino turn off/release relays when turn car off via key, car shuts down.
it's simple fix, cannot work out how it.
the other way give arduino say, 10 minute delay, release relays (hopeing have key in) i'd rather not that.
if shed light on this, appreciated!
i wish make comprehensive tutorial on how once i'm finished
my project similar, tap ignition line(its hot if key in on position) , step down logic levels, , feed 1 of pins; testing high or low in arduino.
aka
if key on positiion, energizes ignition wire; have arduino setup sense (probably stepping down 12 volt 5) , connecting general i/o pin; when arduino senses ignition wire energized, releases relay.
aka
if key on positiion, energizes ignition wire; have arduino setup sense (probably stepping down 12 volt 5) , connecting general i/o pin; when arduino senses ignition wire energized, releases relay.
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