Wiring  Pinouts                                                 

Someone's wiring mess.

It looks as though very one of the Arduino Uno’s pins are going to be used. There are 6 analog and 13 digital I/O. I added a 4x20 liquid crystal display (I2C LCD eBay $11.95) and a game controller four button left-right-up-down rocker switch to the project. It turns out that this LCD must use analog channels A4 and A5.

At the moment the Arduino pinout looks like this:

       Digital Pins    0     I/O       USB TDX

                            1     I/O       USB RDX

                            2     Out      Caliper valve R

                            3     Out      Caliper valve L

                            4     Out      Ultrasonic sensor Trigger

                            5     Out      Servo PWM R

                            6     Out      Servo PWM L

                            7      In        Break switch

                            8      In        Wheel speed sensor

                            9      In        Ultrasonic sensor Echo

                          10      In        Up momentary switch

                          11      In        Down momentary switch

                          12      In        Slower momentary switch

                          13      In        Faster momentary switch

    Analog Pins   A0      In        Pressure sense  R

                         A1      In        Pressure sense  L

                         A2      In        Rotation sensor R

                         A3      In        Rotation sensor L

                         A4      I/O      I2C display SDA

                         A5      I/O      I2C display SCL

I am using a 13 wire cable with quick connectors that came out of a retired car’s CD changer, to carry the connections between the legs and the Arduino in the cart. The cable pinout looks like this:

  0. Shield                               Ground

  1. Orange                              5 volt for sensors

  2. Pink (big)                          Not used

  3. Black (big)                        Ground

  4. Yellow                              Rotation sensor right

  5. Red in Brown shield          Pressure sensor right

  6. Dark blue                         Servo PWM right

  7. Brown & Grey shielding     Ground

  8. Purple                             Rotation sensor left

  9. White in Grey shield         Pressure sensor left

10. Grey                                Servo PWM left

11. Brown                              Not used

12. Powder blue                     Not used

            13. Green                              Not used

An additional four conductor cable was needed to power the caliper valves and to supply power to the servos. The servo power lines caused sensor noise when they were inside the 13 wire cable. All is well now.

           Black   –   Ground                        Red      –    6 volts for servos

           Yellow -   24 volts Left caliper      White   –  24  volts Right caliper

Project Electrical Layout.