Published on April 7, 2009
Yet another application of microcontrollers… GIBSON GUITAR ROBOT Team – Sleeping Mode Abhishek Anand - BG107Cs003 Abhishek Mishra - BG107CS004 Akash Gupta - BG107CS010 Manish Kumar - BG107CS062 Paramjeet - BG107CS080 Subhash Choudhary - BG107Cs119
The Problems of a Guitarist • Tuning mechanism hasn’t evolved much. • Each peg is still turned manually to get the right tone. • Factors like heat change the tone of strings. • Stretched strings are very tough to keep in tone. • People rely on software like Guitar Tuner Pro. • Inconvenience. • Lot of time gets wasted.
The Solution Gibson Guitar Robot
The Solution Gibson Guitar Robot • End to manual peg twisting • Automatic tuning in seconds! • Accurate results • Uses Microcontroller and Motors
Features Gibson Guitar Robot • Dynamic Tuning • Read and Right • Speed Dial • Switch Beats • 200 tunings between battery charges
The Setup MCK – Master Control Knob • adjusts volume – normal function • on pull – becomes tuning selector • LEDs show status of tuning • shows battery level (1-10)
The Setup Charging System • 2.4 V NiCd battery pack • Stepped up to 12V to power other parts (motors etc) • 90 minutes full charge •200 tunings per full charge
The Setup Powerhead Locking Tuners • Rohm's BA6845FS motor drivers • Rotates to pull strings for tuning • RPM is reduced by ratio of 500:1 • also works for manual tuning
The Setup Piezo Pickups • detects frequencies • feeds signals to Data Transmitting Tailpiece • the signals are multiplexed into C8051F120 MCU’s Analog/Digital input
The Setup Data Transmitting Tailpiece • contains Silicon Labs C8051F120 12-bit MicroController • uses crystal-derived reference frequency, to decide if string’s frequency is flat, sharp or on pitch. • depending on the string’s frequency, controls the motors in tuners
Silicon labs C8051F120 12-bit • High Speed 8051 uC core • 100 MIPS Mixed-Signal with 64 I/O Lines • 5 Timers + 1 Watch Dog Timer • 128K Byte In-System Programmable FLASH • 256 Bytes RAM • 8K Bytes XRAM • 2 UARTS • Supply Voltage 2.7V – 3.6V
Working #1 Master Control Knob is pulled up • this enables the C8051F120 unit • lets user load a preset
Working #2 Pickup detects frequencies • converts string vibrations into frequencies • multiplexes all 6 string frequencies • feeds them to C8051F120 ‘s input
Working #3 Tailpiece (MCU) analysis • C8051F120 MCU analyses the signals from pickup • decides which string to tune • decides how much to tune on the basis of • preset loaded • temperature • sends signals to Rohm's BA6845FS motor drivers
Working #4 String Tuning • Rohm's BA6845FS motor driver controls the tiny servo motors attached to each string • Each string is rotated unless it reaches desired frequency
Precautions • Make sure no two strings touch each other – might lead to short circuit • Make sure MCK is not pulled when while guitar is in storage, this would drain out the battery completely • While strings are removed, make sure that Tailpiece (MCU) doesn’t move, this could damage its connectors • Don’t turn the pegs manually while MCK is pulled, i.e. Robot is ON
Conclusions • We saw, how a microcontroller helps in automating difficult tasks. • A microcontroller makes redundant tasks easier. • Gibson Guitar Robot is able to take intelligent decisions by help of a microcontroller. • A microcontroller adds more functionalities and values to a product.
Thank You… For more information - • http://www.gibson.com/robotguitar/guitar.html • http://www.eetimes.com/showArticle.jhtml?articleID=207400963 • C8051F120 Datasheet http://www.datasheetarchive.com/C8051F120-datasheet.html
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