Rotation Measurment with Encoders

  • #1
I am trying to both design a code for Arduino and build a circuit connected with the Arduino which uses 3 anode 7 segment and 3 resistor arrays with 7 pins to connect to the Arduino Uno. The encoder is a rotary encoder. I have Pin A of the rotary encoder connected to pin 13 of the Arduino and Pin B connected to the pin 12. From there on I am not sure where to conncect from. I do believe to connect all 3 7 segments I need to use one of the arrays in parallel with the rest and then connect to the Arduino Uno. I need the 7 segment LED's to read the angle at which the Rotary Encoder is currently at. Up to 360.
 

Answers and Replies

  • #2
Baluncore
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You have two quite separate problems.

Firstly you have a rotary encoder. That will produce two signals called A and B. Those are in quadrature. There may also be a zero position synchronise output available. What model is your encoder? Do you have a link to a data sheet?

Secondly you have a three digit, seven segment display. If you were to use a display with a serial interface you would need less wire but it would take a little more code. An LCD would need less current than an LED display. Have you selected a display. What is the make and part number.
 
  • #3
The 3 different LED 7 segments are required for this project to display the angle. The rotary encoder I have has he serial number faded but I know for sure it does not have a zero position output available. The LED 7 segments are common anode part # 5611BH. All connected to the Arduino Uno thru 3 different resistor banks.
 
  • #4
Baluncore
Science Advisor
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The counting of pulse edges from the encoder will be critical because you will have to re-establish zero if you miss a step. That suggests you will need an optical sensor or a micro-switch to detect when the encoder axis passes zero in a particular direction. Alternatively, a press-button to set when the angle is at zero.

You will need 21 pins to connect the three 7-segment displays directly.
If you do not have enough output pins available, you will need an alternative solution.
Maybe consider;
1. Three addressable latches to hold the segment bits and drivers to sink the segment current.
2. Decoders from 4 bit BCD to 7 segments will reduce the bits output to 2+4+4=10 bits.
3. You might multiplex the LEDs with one digit powered at the time. That will need 3 anode transistor drive bits, plus 7 segment bits = 10 bits total.
4. Or multiplex with a four to seven decoder chip with three anode driver transistors = 4 + 3 = 7 bits.

You need to investigate the drive capability and how many output pins are available.
Ask much more specific questions.
 
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