Raspberry Pi Home-brew Audio
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This document discusses building a homebrew Sonos system using a Raspberry Pi, including the hardware and software components. The hardware includes a Raspberry Pi Zero, PhatDAC, and speaker. The software uses OpenHAB for home automation, Mopidy for music streaming from various sources, and SnapCast for synchronizing audio between rooms. The goal is to create a whole-home multi-room audio system with open standards and customizability, without vendor lock-in, for less money than a traditional Sonos setup.
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became simple and cost effective. This paper illustrates the scheme of integrating of photo-voltaic (PV) system
as distributed generation to micro-grid. PV system is integrated to grid with three-level inverter and five-level
cascaded H-Bridge inverter to invert the type of supply synchronized to grid. Inverter will be controlled with
simple current control strategy. Results were presented for the proposed work considering cases like DG
sending only active power and DG injecting both active and reactive power through three-level and five-level
inverter topologies. Total harmonic distortion in source current and voltage of grid reduce when using multilevel
topology. Rate of change in voltage also reduces resulting in reduced filters when level at output of
inverter is increased.
6.design fabrication and analysis of tri wheeled electric vehicle (2)
In daily life we can observe the difficulties of carrying the patients, old people, physically handicapped in public places like airports, railway stations, bus stands, hospitals, college campuses etc. To aid such people we prepared an electric tri-car to ease the task of carrying them. Moreover, it is a multipurpose vehicle to carry pilgrims in pilgrim places, to carry inspection teams in industries, estates or campuses etc. The seating arrangement of this tri-car is such a way that the disabled can easily get into the vehicle and also get down. This tri-car is designed and analyzed with the help of the soft ware called PROE. Then analysis is done in Statistical and Modal Analysis. We modeled and fabricated a tri-car into a three wheeled electric powered vehicle with three seats and can accommodate two pillions and a driver. We designed the vehicle to be propelled by an electric hub motor mounted in the front wheel and powered by 48V Lithium-ion battery.
4. comparision of pifuzzy techniques for compensation of unbalanced voltages ...
This paper proposes an effective controller for grid connected wind turbine based permanent magnet synchronous machine for improving unbalanced voltages. In this paper, we proposed a comparative analysis under different controllers like PI and Fuzzy Controller to PMSG system. A control structure is designed based on the positive sequence reference signals. With the help of these controllers, the double frequency oscillations in DC-link voltages and variations in active power can be eliminated. More ever, the proposed system can be implemented in Matlab/Simulink and the performance of the proposed Grid based PMSG wind system under grid fault conditions is verified.
3. simulation of 11 level hybrid cascade stack (hcs) inverter with reduced nu...
This paper presents a new multilevel topology based on cascaded hybrid multi-level (HCS)
inverter. There are different topologies for cascaded inverters for reducing the switches, power loss. The output
voltage is increased and the number of switches is reduced with the HCS inverter. Due to this reduction in
number of on-state switches, power loss and voltage drop is reduced. Simulation results for 11 level symmetric
form of converter is described.
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Resumo de direito previdenciário 2016 concurso inss
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презентация к методической работе по теме состав слова
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5. multi level inverter with simplified control strategy for distributed ener...
5. multi level inverter with simplified control strategy for distributed ener...
6.design fabrication and analysis of tri wheeled electric vehicle (2)
6.design fabrication and analysis of tri wheeled electric vehicle (2)
4. comparision of pifuzzy techniques for compensation of unbalanced voltages ...
4. comparision of pifuzzy techniques for compensation of unbalanced voltages ...
3. simulation of 11 level hybrid cascade stack (hcs) inverter with reduced nu...
3. simulation of 11 level hybrid cascade stack (hcs) inverter with reduced nu...
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Raspberry Pi Home-brew Audio
- 2. 1. The Challenge (or “Why would you do this?”)
- 3. ...because...reasons... Whole House Audio ✖ Multiple Inputs ✖ Multiple Outputs ✖ Different Sources for different rooms ✖ “Broadcast” mode No “vendor lock- in” ✖ My choice of providers ✖ My choice of hardware ✖ My choice of software Easy managment ✖ Phone ✖ Tablet ✖ Browser ✖ API
- 4. Open Source + Raspberry Pi?
- 6. Sonos Play:1 - £199
- 7. Pi Zero + PhatDAC + Speaker = £52
- 8. ...because...reasons... Raspberry Pi Zero ✖ Tiny form factor ✖ Runs Linux ✖ GPIO enables DAC connections PHAT DAC ✖ Cheap ✖ Excellent Audio Quality ✖ Easily converts between RCA and 3.5mm jacks Caseflex Speaker ✖ Built-in Sub ✖ Bluetooth, 3.5mm, SD Card and USB in ✖ Available in Black or White
- 10. ...because...reasons... Home Automation via OpenHAB ✖ Already used for my lights (LightwaveRF) ✖ Has generic plugins to talk to APIs Music Streaming via Mopidy ✖ Written in Python ✖ Loads of inputs already exist ✖ MPD-based to plenty of GUI’s available Client Sync via SnapCast ✖ NTP-Based ✖ Concept of “Rooms” ✖ Multiple Audio Inputs
- 11. OpenHAB
- 12. Mopidy
- 13. SnapCast
- 14. Thanks! Any questions? You can find me at: @proffalken matt@doics.co hackerdads.wordpress.com
- 15. Credits Special thanks to all the people who made and released these awesome resources for free: ✖ Presentation template by SlidesCarnival ✖ Photographs by Unsplash
- 16. SlidesCarnival icons are editable shapes. This means that you can: ● Resize them without losing quality. ● Change fill color and opacity. Isn’t that nice? :)