Powerful for its size and cost, and extemely easy to learn and use. I spend a fair amount of time zipping around townon my scooter, and thought it would be cool to add a voltage monitor to warn when the battery might need recharging. Waiting until the electric starter no longer works is somehow lacking. So after an evening with an Arduino Duemilanove, I had a simple programmable voltage divider with 3
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LEDs indicating battery low, good, and charging. Done. That`s when I saw Liquidware`s very cool TouchShield Slide OLED display with touch screen. It was telling me it wanted to be on my scooter. It`s a bit overkill for just battery status, so I added temperature and time/date readouts. I went to Sparkfun and found a DS18B20 temperature sensor and a DS1307 RTC chip. Perfect. Oh wait, what`s this. an accelerometer Sweet! Hey, a GPS chip. You can see in the first photo that the TouchShield display is separated from the Duemilanove / Cell Module / Sensor shields. These are installed "under the hood" of my scooter and provide power and signals to the display module via a standard 8-wire ethernet cable. This keeps the sensors (accelerometer, GPS, cell module, etc. ) with the scooter making it functional even without the removable external display, as we`ll see later. (NOTE: this photo was taken before the display was fully mounted inside the enclosure, and is shown without the protective rubber boot. ) The sensors are mounted on a Proto Shield PCB from Ladyada`s Adafruit Industries (which is also where I get my Duemilanoves). Most of the wiring was done using 30 gauge Kynar solid wire, with heavier gauge used for some power and ground connections. Good mechanical connections are important considering the shock and vibrations this will be subjected to. I went with breakout boards for the surface mount chips. They take up a bit...
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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