This design explains how to use an encoder to set the number shown by a 7-segment display. Turn the knob clockwise to increment the number, turn it counterclockwise to set it back. Encoders are the most practical (and handy) way to set a large number of digital devices. Think of an alarm clock, would'nt be easier to set the alarm time simply turning a knob, in place of frantically pressing a couple of buttons? By the way, grandma alarm clock works exactly in that way. The circuit counts four main parts (Nutchip, encoder, display driver and display), nonetheless should not be difficult to understand. Its a matter of connecting two Nutchip inputs to the two encoder pins, and all four Nutchip outputs to a 4511 7-segment display driver.
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We suggest you to read the counter project pages for a detailed description of the 4511 and 7-segment displays. Here we note how all of the display connections are handled by the 4511 itself. The display, a common-cathode part, has been selected because it fits nicely a breadboard, but you can replace it with another brand or model provided it is a common-cathode type. Also, different parts can have different pinouts, therefore require a different board wiring to suit the new layout. To pinpoint all of the pins, try to power the display with a 5V source connected in series with a 390 ohm resistor (for limiting the current). Try powering different pin pairs until the whole pin/segment pattern is discovered. A good puzzling game for a rainy day, if nothing else...
The incremental-type (also known as quadrature-type ) encoder connects directly to a couple of input pins (IN1 and IN2). We can think of an encoder in terms of a pair of switches (namely A and B encoder pins) with one of their pins connected together (COM pin). We connected this common pin to GND; therefore, from Nutchip's perpective, the A and B switches acts like any other pair of common-or-garden switches. The Nutchip reads an "1" on the input when the switch is open, and a "0" when the switch is closed. No other parts are required, as Nutchips include an internal pullup resistor which makes the input positive (a logic "1") whenever the pin is not connected to...
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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