Well, I have few good uses for it, one of them is ensure in meetings people are respectful of time and are not taking all the time for their own topics. Good for ship-room or SCRUM meetings. Following is a list of parts and for the special ones a link for where you can buy them. Consider searching eBay or other stores for getting best prices. Y
Click here to download the full size of the above Circuit.
ou might also need some male-to-female jumper wires like these: to connect between the display and the Arduino. Also, depending on the exact format of the RTC module, you might need different jumper wires too. If you go with the one mentioned above, it has male header so you can use these male-to-female wires. For connecting the display you need 6 wires and for the RTC 4 wires. Depending on how and what type of buttons you choose, you will need wires and optionally a bread-board to place them on. a) The LED Matrix is pretty nice one and comes from Sure Electronics. Apparently there is a confusing list of variants for this type of display. The link to the Arduino store is where I got mine. b) You can easily change the RTC to be any other, including DS1307 based which is cheaper (less than $4. 00 on eBay). Minor code modifications might be required depending on which RTC module you choose. c) I used Arduino Nano that also has the USB connection, easier to program it and all. To save on cost you can choose any variant actually that is 5V one (the matrix display is designed for 5V logic) Once you enter to this mode, the time to countdown is displayed on the 2nd line with a Yellow down arrow. Pushing Setup lets you edit the time to countdown. Plus or Minus buttons will be used to set minutes and seconds. Pushing Start/Stop again in this mode will start the countdown, time left will be displayed on the 2nd line with a Red...
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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