A project on temperature/humidity logging a couple of years ago. In that project I logged the temperature and humidity readings in my basement lab over the course of a year. One issue with the approach I took back then was that the data could not be observed in real time because the logged data were written to an SD card and could only be re
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trieved once the logging process was done. So naturally this time around I wanted to build a data logger with better capabilities. One way to obtain real time data is to stream the logged data over the Ethernet so that the data can be logged, processed and then displayed on a PC. And this is the approach I took. The Ethernet chip Arduio officially supports is WIZnet`s W5100. But it seems that Microchip`s ENC28J60 based controller boards can be had at a much lower price point and several libraries (like this one ) already exist so I decided to give that a go. The temperature/humidity sensor I used in this project is Sensirion`s SHT21. I have used it in many of my projects before and it is very easy to use with various libraries readily available. One thing to note is that the maximum Vcc for SHT21 is around 3. 3V. So if you were to use 5V on your MCU, an I2C level translator (i. e. TI`s PCA9517 ) needs to be utilized in order to avoid damage to the sensor. The ENC28J60 module I used can be obtained on eBay for less than $5. Since both the sensor and the Ethernet module operate at 3. 3V, it is much easier to power the MCU at 3. 3V as well so that we do not have to worry about voltage level translations. While ATmega328p is not rated to run at 16Mhz at 3. 3V, in normal cases this shouldn`t be an issue. Since the default Arduino fuse settings assume a 5V supply voltage, you might need to adjust the fuse settings in situations...
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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