Jivelite rotary encoder how to#

To display the value of the variable which will be increased or decreased by rotating the Rotary encoder we need a display module. The two output pins are connected to D9 and D8 respectively. The switch of the encoder is connected to digital pin D10 and is also pulled high though a 1k resistor. The first two pins are Ground and Vcc which is connected to the Ground and +5V pin of the Arduino. The Rotary Encoder has 5 pins in the order shown in the label above. The complete circuit diagram for Interfacing Rotary Encoder with Arduino is shown in the picture below

Jivelite rotary encoder how to#

Now let us learn how to interface it with Arduino. Finally it has the two output pins which produce the waveforms as already discussed above.

The signal from this switch is obtained through the pin 3 (Switch). Apart from rotating the knob in clock wise and anti-clockwise direction, the encoder also has a switch (Active low) which can be pressed by pressing the knob inside. The first two pins (Ground and Vcc) is used to power the Encoder, typically +5V supply is used. The pinouts of the KY-040 Incremental type rotary encoder is shown below KY-040 Rotary Encoder Pinout and description The Encoder used here is an Incremental type Encoder. These encoders are classified based on the Output signal and sensing technology, the Incremental Encoder and Absolute Encoders are classified based on Output signal and the Magnetic, Optical and Laser Encoder are classified based on Sensing Technology. There are many types of rotary encoder in the market the designer can choose one according to his application. Hence when the knob is rotated clockwise the Output A will go high first and when the knob is rotated anti-clockwise the Output B will go high first. If you take a look at the two pulses you can notice that they both are 90В° out of phase. This is because we need to identify in which direction the knob has been rotated.

Now the question may arise that, why do we need two pulse signals when one is enough to count the number of steps taken while rotating the knob. Now, if we count the number of pulses we will be able to determine how many steps the Encoder has been moved. When the conductive pad is directly under the pin it goes high resulting it on time and when the conductive pad moves away the pin goes low resulting in off time of the waveform shown above. The output waveform produced by the Output pin A and Output B is show in blue and green colour respectively. Here there are two output pin, Output A and Output B as shown in the figure below. The Output pins are fixed on top of this circular disc, in such a way that when the knob is rotates the conductive pads get in contact with the output pins. These conductive pads are placed at an equal distance as shown below.

It basically consists of a circular disc (grey colour) with conductive pads (copper colour) placed on top of this circular disc. The internal mechanical structure for the Encoder is shown below. There are many types of Encoders each with its own working mechanism, we will learn about the types later but for now let us concentrate only on the KY040 Incremental Encoder since we are using it for our tutorial. It consists of a knob which when rotates will move step by step and produce a sequence of pulse trains with pre-defined width for each step. A Rotary Encoder is an electromechanical transducer, meaning it converts mechanical movements into electronic pulses.