The Arduino Controlled, Phone Operated, House Wide Audio System (Part 2)
part 3: circuit
so ethernet shield allows our arduino communicate phone, how can arduino control audio signal going speakers? problem solved using fantastic pt2258 ic. little guy receives commands on i2c (pronounced eye-squared-see) bus , has 6 channels of control match our 6 channel amp. chip take 6 audio inputs , can control volume range of -78db 0db. various types of commands can receive located in datasheet , discussed more later.
we need figure out how wire little guy up. if beginner, stop. learning opportunity. go buy cheap soldering iron. not need 1 project. should able find 1 under $20. go find old printer, computer, toaster, etc. , rip apart. find circuit boards , have @ it. soldering tricky , takes quite bit of practice master. find tutorial of liking (trust me, there plenty out there) , learn.
not bad, huh? can scratch "brutally tear apart , defile toaster" off bucket list.
time choice. there 2 routes can take hooking pt2258 chip arduino. buy prototyping board such this , wire yourself, or did , design own pcb make things easier , neater. (i have attached board file of don't feel designing own) either way going following schematic in pt2258's datasheet exactly. not skimp out on capacitors or resistors. these necessary elements of circuit , without them may severely disappointed in sound quality.
there 3 types of components needed: capacitors, resistors, , pt2258 ic itself. each has different, equally important role in circuit. capacitors store charge , release if there sudden drop in power supply side of input. when wired in configuration shown in datasheet, capacitors function smooth audio signals , remove sharp or sudden spikes. resistors used lower voltage or hinder current flow. in configuration shown in datasheet, 1 end connected source , other ground, resistors called "pull down resistors" meaning when there no input signal, circuit pulled down ground. has handy effect of removing annoying static or buzzing when nothing being played through system.
if chose second method of designing own pcb, head on over sparkfun's excellent eagle tutorial. eagle piece of software used designing , manufacturing pcbs.
we need way audio pt2258 chip, right? easy way pick couple 3.5mm through hole jacks. allows input whatever source system want. need way transfer audio output of pt2258 chip our amp. used more 3.5mm jacks on pt2258 board , few rca 3.5mm adaptor cables. there needs way connect board arduino stick few male headers on board connected +5v, gnd, scl, sda, code1, , code2 (code1 , code2 used change i2c address of chip allow more 1 pt2258). used these cables connect board arduino.
when schematic finished, should this. reason have 2 sets of male headers daisy chaining boards larger systems.
also notice how connections in datasheet match of schematic.
next need convert schematic actual board. if used sparkfun tutorial should know how this! mine ended looking this.
click here part 4: assembling board
so ethernet shield allows our arduino communicate phone, how can arduino control audio signal going speakers? problem solved using fantastic pt2258 ic. little guy receives commands on i2c (pronounced eye-squared-see) bus , has 6 channels of control match our 6 channel amp. chip take 6 audio inputs , can control volume range of -78db 0db. various types of commands can receive located in datasheet , discussed more later.
we need figure out how wire little guy up. if beginner, stop. learning opportunity. go buy cheap soldering iron. not need 1 project. should able find 1 under $20. go find old printer, computer, toaster, etc. , rip apart. find circuit boards , have @ it. soldering tricky , takes quite bit of practice master. find tutorial of liking (trust me, there plenty out there) , learn.
not bad, huh? can scratch "brutally tear apart , defile toaster" off bucket list.
time choice. there 2 routes can take hooking pt2258 chip arduino. buy prototyping board such this , wire yourself, or did , design own pcb make things easier , neater. (i have attached board file of don't feel designing own) either way going following schematic in pt2258's datasheet exactly. not skimp out on capacitors or resistors. these necessary elements of circuit , without them may severely disappointed in sound quality.
there 3 types of components needed: capacitors, resistors, , pt2258 ic itself. each has different, equally important role in circuit. capacitors store charge , release if there sudden drop in power supply side of input. when wired in configuration shown in datasheet, capacitors function smooth audio signals , remove sharp or sudden spikes. resistors used lower voltage or hinder current flow. in configuration shown in datasheet, 1 end connected source , other ground, resistors called "pull down resistors" meaning when there no input signal, circuit pulled down ground. has handy effect of removing annoying static or buzzing when nothing being played through system.
if chose second method of designing own pcb, head on over sparkfun's excellent eagle tutorial. eagle piece of software used designing , manufacturing pcbs.
we need way audio pt2258 chip, right? easy way pick couple 3.5mm through hole jacks. allows input whatever source system want. need way transfer audio output of pt2258 chip our amp. used more 3.5mm jacks on pt2258 board , few rca 3.5mm adaptor cables. there needs way connect board arduino stick few male headers on board connected +5v, gnd, scl, sda, code1, , code2 (code1 , code2 used change i2c address of chip allow more 1 pt2258). used these cables connect board arduino.
when schematic finished, should this. reason have 2 sets of male headers daisy chaining boards larger systems.
also notice how connections in datasheet match of schematic.
next need convert schematic actual board. if used sparkfun tutorial should know how this! mine ended looking this.
click here part 4: assembling board
Arduino Forum > Topics > Home Automation and Networked Objects > The Arduino Controlled, Phone Operated, House Wide Audio System (Part 2)
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