The strategy is to get the circuit going in stages, testing each part as you go. Once everything is wired correctly and can be either controlled or read by the computer correctly, then you can write the main program with confidence that all the pieces are working. Follow the directions shown in the Arduino Guide ( PDF file ) under the `Flashing an
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LED" section. Use this program to confirm that the LED works under computer control Follow the directions shown in the Arduino Guide under "Reading a Switch". Use the program shown in the Guide to confirm that the Arduino is reading the switch properly. The stream of 1`s going across the monitor window should change to 0`s when you close the switch. If it doesn`t, read the voltage at Pin 3 with your DMM. It should be 5 V with the switch open and 0 V with the switch closed. If it isn`t, remove the switch from the circuit and check for continuity with the beeper function of your DMM. The DMM should beep when the switch is closed (short circuit) and stay silent when open (open circuit). Sometimes switch contacts get dirty so if you aren`t getting a short circuit, try wiggling the switch button while it is closed. The code assumes the switch is connected to Pin 3 on the Arduino, but any pin can be used. Do not connect your motor directly to an Arduino pin and do not use the 5 V power from the Arduino board to power your motor. Instead, control the motor using your TIP120 transistor and a separate 9V or 12V battery. The motor can be either the gear motor or the small motor. For the small motor, you can use the 2N3904 transistor as the switch. "Px" is any I/O pin on your Arduino. For this exercise, use P4. Connect the minus of the battery to the emmiter of the transistor (E pin) and then also connect the emmiter of the...
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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