pi_dial

read NZ rotary dial's input from a retro phone using raspberry pi

reverse arranged dial in NZ

Wiring:

Dial	Pi
4	GND
5	GPIO16
3	GPIO20

Example of signal:

              |    while dialing, p5 will toggle until the dial back to its home position    |

p5: __________--------------------------------------------------------------------------------_______________
p3: _________________________________________--------___-------___--------___-------___-------_______________

                         |      when released, the rotary dial will start rotating back      |
                         |            and sending pulses to p3 on its way back               |
                                             |      this piece in p3 is the signal to be     |
                                             |       processed and read the number from      |
input_number = 10 - pulse_count

Usage:

use argument -f to freeze the signal

file
v1.py	only 2 wires connect to port 4 and 5, can just read the number but not robust
v2.py	3 wires version, the proper way of connection
read_gpio.py	visualise gpio input, read from GND by default for debugging. use -p port_number to select port, use -l set port to PUD_DOWN which is PUD_UP by default

Signals for all the number:

reading interval is set to 0.01s

-------___--------__--------___--------__--------___-------___--------___-------___--------___------                    
Number: 0

--------__--------__--------___--------___-------___--------__--------___-------___-------                              
Number: 1

--------___--------__--------___-------___--------___-------___--------__-------                                        
Number: 2

--------__--------___-------___--------___-------___--------___------                                                   
Number: 3

--------___--------___-------___--------__--------___-------                                                            
Number: 4

--------___-------___--------___-------___-------                                                                       
Number: 5

--------___-------___--------__-------                                                                                  
Number: 6

--------__--------___-------                                                                                            
Number: 7

--------__-------                                                                                                       
Number: 8

-------                                                                                                                 
Number: 9