Today is a turning point for the project. The turntable is finished.

Speed control and light organ with servo lift are built in.

And now that the table is publishing data to the cloud, it's officially a Thing.


clean desk


If I was a stressful person, a big weight would fall of my shoulders now.

I'm not a stressful person. But I am happy that I reached this point.

A point of luxury and freedom. I still have loads of time to tap into the cloud part. To creativity!




What's Built into the Table


There are two Arduinos -Yún and UNO, the Infineon Motor Shield and various electronics.

The Yún has audio sample, light organ+servo lift, and MQTT publishing duty.



arduino yun under proto board


The protoboard on top of the Yún has a one transistor pre-amplifier + DC biaser. The duty of that little circuit is to push the AC audio into the 0->5V range of the Arduino ADC.

It also holds the connectors for the stepper motor and the light organ LEDs.


The UNO serves as motor speed controller. It measures the speed from the IR optocoupler that I've built for this project.


Photo 15-04-15 17 57 49.jpg


The UNO uses the Infineon Motor Shield to control the motor, and also shows what's happening on 3 LEDs (fast - on speed -slow).


infineon motor shield


Everything runs now, and the Perpetuum Ebner is happily sharing the spectrum analysis on the internet.


What Now?


I can spend the remaining time on the satellite ideas. They'll tap into that MQTT stream and do something with it.

And unbox the SAMA5D4 again. It's been neglected the last weeks.

And I can also spend a sunny warm evening outside to finalize the mounting of the devices on the sub-chassis.

As you can see on the photo below, there's room for (invisible) improvement there.


Photo 09-06-15 20 17 22.jpg



Table of Contents
Chapter 1: Fix the turntable
1: Perpetuum Ebner Musical 1
2: A Time to Kill and a Time to Heal
3: Preparation for Motor Drive
4: Motor control with Infineon Motor Shield and Arduino UNO
5: Turntable speed sample testbed with Arduino UNO
6: Turntable Speed Sensor design
7: Control Theory - End of Chapter 1
Chapter 2: First Enchantments
8: Digital Light Organ Enchantment
9: Autonomous Servo Lift
10: SMD Time - Solder the IR Speed Sensor PCB
11: Yelp - who can Help me to Compile and Run my First SAMA5D4 C Program
12: Son et Lumiere - End of Chapter 2
Chapter 3: Taming the Board
13: Breakthrough - Run my own C++ Program on the SAMA5D4
14: Digital Light Organ Input Buffer
15: SAMA5D4 Blinky
16: Scope Creep
17: Audio Sampling with 16-bit ADC ADS8343
18: Sending Files to SAMA5D4 over USB
19: Port my Light Organ from Arduino to SAMA5D4
20: Fast Fourier Transform on the SAMA5D4 - End of Chapter 3
Epilogue: Reaching for the Clouds
21: Right-Sizing my Plans
22: My Own C++ Buffered Sampler on the SAMA5D4
23: Building In the Motorized Light Organ
24: Up to the Clouds with Yún
25: Publish or Perish
26: Turntable Finished
Stretch & Boni
Bonus 1a: Remote Light Organ with WiFI pt. 1
Bonus 1b: Remote Light Organ with WiFI pt. 2
Grande Finale: Paho MQTT Client on the SAMA5D4
Related blog
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958
Review 1: Atmel SMART SAMA5D4 Xplained Ultra Unboxing and First Steps
Review 2: Atmel SMART SAMA5D4 Xplained Ultra - Building the Libraries from Source
Review 3: Digital Continuous Rotation (360°) Servo Part 1
Review 4: Digital Continuous Rotation (360°) Servo Part 2
Review 5: Atmel SMART SAMA5D4 Xplained Ultra - TCP/IP running
Review 6: Atmel SMART SAMA5D4 Xplained Ultra - LINUX Distro with SSH support
Enchanted Objects: Let's work together to tame the ATMEL SMART SAMA5D4 Xplained Ultra kit
17 bis: Off South...
Review 7: Atmel SMART SAMA5D4 Xplained Ultra - C++ ADC Example on Linux
Review 8: Atmel SMART SAMA5D4 Xplained Ultra - Product Review
Review 9a: Atmel SMART SAMA5D4 Xplained Ultra - Set up ADC Buffer with Hardware Trigger Part 1
Review 9b: Atmel SMART SAMA5D4 Xplained Ultra - Set up ADC Buffer with Hardware Trigger Part 2
Review 10: Atmel SMART SAMA5D4 Xplained Ultra - New Content on AT91.com
1958 Turntable from the Black Forest - Summary of the Enchanted Player Story