The LD2451 module is a small radar with long range capability.( 100m max ), 30° detection angle, with serial and ble connectivity.
Asked claude sonnet 5.5: "create mit app inventor app for reading ld2451 radar sensor. Generate aia file"... and after a few iterations got a fully functional base app ( claude initially used standard bluetooth while the module is ble... ).
Could be used, for example, as an alert for approaching vehicles...
LD2451_BLE1b5.aia (746.2 KB)