Magic mirror raspberry pi reddit5/9/2023 ![]() The sensor, whether mounted on the cab or the hydraulic arm will be mounted on a platform attached to a steel structure that transmits and mechanically amplifies vibration. You may need multiple sensors to determine what’s happening at the sides of the hole to determine what’s happening at the bottom. The echo from a complex surface of stone(s), hard packed natural contour, loosened earth and material falling/fallen back into the hole will be a more complex and return from the sides of the hole will mimic a soft bottom to some extent, making it even more difficult to determine the hole depth. The echo from a hard flat surface is easy to interpret. The sensor measures the time delay of a sonic echo returning to infer distance. ![]() Re: mount in backhoe … two significant challenges beyond mounting it somewhere it can make the measurement and, assuming that it’s not mounted on the cab, finding shielded cable with fine stranding and soft insulation that can withstand the bending at the arms joints, and a flexible plastic armor to encase it in. Here is the structure as a circuit diagram: If there would be no connection to GND, the input would be undefined if no signal is sent ( randomly 0 or 1), so ambiguous. If no pulse is sent, the signal is 0 ( through the connection with GND), else it is 1. The connection to GND is to have a obvious signal on GPIO24. ![]() We do this because the GPIO pins only tolerate maximal 3.3V. On its end you connect it to Pin 18 (GPIO24) and through a 470Ω resistor you connect it also to Pin6 (GND). There are four pins on the ultrasound module that are connected to the Raspberry: This tutorial shows the connection and control. These small modules are available starting at 1-2 bucks and can measure the distance up to 4-5 meters by ultrasound and are suprisingly accurate. For many ( outdoor) projects a distance measurement is necessary or advantageous.
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