What is Reddit's opinion of Arduino Bluetooth RC Car?

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This is the app : https://play.google.com/store/apps/details?id=braulio.calle.bluetoothRCcontroller&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dbluetooth+rc+controller&pcampaignid=APPU_1_O8ibXNXYBoWTlwTLwqTIBw. There is more case when I'm adding manual control but this part is working well. I just want to put AutoPilot On/Off with the app. With the Serial.available() function I could do something like if Serial.available() > 2; Pilot = 1; if i press two buttons at the same time for example and it will be detect when the AutoPilot program end ? Thank for your help.

Those would work. Also, there is a pretty nice android app called Arduino Bluetooth RC car https://play.google.com/store/apps/details?id=braulio.calle.bluetoothRCcontroller&hl=en that is meant to retrofit to the RC cars just like you got. I tried it and it works pretty well.

You need an Arduino, maybe the Uno. You can get them on ebay for $5.00 or so, but takes 3 to 4 weeks to arrive. That and the Bluetooth module would be compatible with the Android phone app https://play.google.com/store/apps/details?id=braulio.calle.bluetoothRCcontroller&hl=en He gives a pretty good description of how it works on his website. For the PS3, see https://github.com/Lauszus/PS3-Controller-BT-Library-for-Arduino