There are situations in home automation applications where you would like to measure the level of some body of water (e. g. pool, pond). The 1-Wire network makes it easy to interface sensors to a PC or simple controller. Some experimenters use a string of capacitors and a timer to measure water depth. I decided to use a simple optical approach. The
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idea is very simple. A pin-pong ball floats on top of the water in the pipe. An infrared triangulation sensor outputs a non-linear voltage corresponding to the distance to the ping-pong ball. The prototype system can measure level changes of up to 24cm with a resolution of around 1cm. This range / resolution can be changed by using different infrared sensors. A lookup table created from the polynomial can be stored in the DS2438 40 Byte nonvolatile memory. This makes the water level sensors easily replaceable. Storing the voltage multipled by 100 as a single byte allows a 40cm range to be stored. For the prototype the values are: The Link 1-wire RS-232 adapter is used to communicate with the sensor. TCL routines are used to process the data. TCL for Windows is available from ActiveState. RRDtool is used to generate graphs. This project is for experimental use only. The user assumes all responsibilities for assembly, installation, and use. This circuit is provided without warranty and the author makes no claim that this device will work in any particular application. Do not use in applications where failure or incorrect operation could jeopardize someone`s safety. This schematic is provided for noncommercial use only.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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