I posted this a while ago but think it' worth a repost because it works so well and was so easy to do. The infrared sensor is ridiculously sensitive...no fobs in car, just simple beam-crossing
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a Seco-Larm E-931-S35RRQ Enforcer Indoor/Outdoor Wall Mounted Photoelectric Beam Sensor with 35 Foot Range https://smile.amazon.com/gp/product/B001LFPB0M and you can mount it any which way you want with the provided mount. And with the lights, I can just look up from the car and know when to stop (red light).
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One power adapter with the wire adapter port (https://smile.amazon.com/gp/product/B078R93PSY $11.99
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an everspring SM103 contact sensor (it has external wired ports) https://smile.amazon.com/gp/product/B07MCSQFHJ $19.99
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The awesome Everpring SM103 driver I found in this community
