3 ms·
Why hasn’t some kid with a couple Raspberry Pies and a laser and sensor guerillaed up how to sense when the train is X distance from some stop and heading this
by buffaloo 8y ago
Why hasn’t some kid with a couple Raspberry Pies and a laser and sensor guerillaed up how to sense when the train is X distance from some stop and heading this way - with some mailing list of people to text when the train approaches?