This may interfere with other libraries that use it. The library uses two timer pins by default.

The first thing to check is memory usage, since nothing will work if out of memory. The library works fine on its own, but doesn't play when library is also included. Audio can be encoded at a lower sample rate otherwise.ģ. The value in #define buffSize 128 can be increased to provideĪdditional memory for playback, which will reduce these issues. If pops or clicks are heard during playback, it is most likely that buffer underruns are occurring or the volume is just too high.Įnsure that #define SD_FULLSPEED is uncommented in pcmConfig.h. Popping or clicking when music is playing Ramps are built into the library to prevent popping when PWM is engaged, disabled, and between music tracks of the same Pop or click when playback is started or stopped:

The induced resistance (impedance) protects the MCU from an over-current situationĭisclaimer: Take advice at your own risk, I have never had a problem over years of usage with small 8-ohm speakers.

Standard rules of DC current (ie voltage/resistance=current) do NOT apply because this is more comparable to a HF A/C waveform.

By program design, there should never be a DC current flowing from PIN->GND or PIN->PIN, it will always be either a LOW-LOW state or a high frequency PWM signal.

This is typically true, but TMRpcm is designed and tested with this configuration: Note: Advice is often given NOT to connect a speaker directly to the digital pins on an Arduino. If using an amplifier, consider that the output is a choppy digital PWM signal, not a smooth analog signal. See your board info for the main 16-bit timer/PWM output pins of your board. On ATMega328 devices (Uno,Nano,etc) pins 9,10. The speaker can be connected directly to the output pins. The SD card should be connected as usual per Then copy file to SD card using computer Connecting Everything Project Rate (HZ) > set to 32000, 22050, 16000 or 11025įile > Export > Save as type: Other uncompressed files > Options.

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