Search found 172 matches

by krzychb
Sun Jun 17, 2018 6:11 pm
Forum: Hardware
Topic: Running ESP32 at 2.8V
Replies: 3
Views: 126

Re: Running ESP32 at 2.8V

Hi @p-rimes, Running a chip at reduced voltage means reducing power consumption by the chip. This is done to e.g. run the chip for a longer time on a battery. The overall power consumption will not be reduced by dropping the voltage (and dissipating power) on a linear voltage regulator. What will be...
by krzychb
Wed May 30, 2018 8:37 am
Forum: ESP32 ADF
Topic: Basic example for mp3 from sd card
Replies: 2
Views: 385

Re: Basic example for mp3 from sd card

escalator wrote:I would like to know how is the correct sequence to jump from file to file if you have many files on sd card during play not only a single file as the example.


Hi escalator,

Check periph_console example that shows how to jump from file to file.
by krzychb
Fri Apr 27, 2018 10:02 am
Forum: ESP32 ADF
Topic: ESP32 LyraT Battery circuitry not working
Replies: 3
Views: 324

Re: ESP32 LyraT Battery circuitry not working

glennhuber wrote:Has anyone been successful powering and/or charging a battery connected to the ESP32 LyraT board? I have not!


Maybe the problem is due not matching polarity of the battery connector as discussed in https://github.com/espressif/esp-adf/issues/9 ?
by krzychb
Thu Apr 26, 2018 1:37 pm
Forum: General Discussion
Topic: i want to map analog pins on 5volt between 0 to 1023 (10 bit resolution)
Replies: 35
Views: 1437

Re: i want to map analog pins on 5volt between 0 to 1023 (10 bit resolution)

mikemoy wrote:Archibald, explained what you need to do. You need to add a voltage divider to each of your A/D input pins. There is no software way around this.


My favorite on that: https://www.youtube.com/watch?v=XxLKfAZrhbM
BTW: I can listen to Afrotechmods all day log. Like to EEVblog :)
by krzychb
Thu Apr 26, 2018 4:37 am
Forum: Sample Code
Topic: why does esp32-lyrat running a2dp_sink example without output ?
Replies: 5
Views: 512

Re: why does esp32-lyrat running a2dp_sink example without output ?

Hi do you mean the example of pipeline_bt_sink in the esp-adf ? it is OK,but i found there is less info about make menuconfig in Readme file . For the the 'pipeline_bt_sink' there is no need to configure I2S pins using menuconfig. Related configuration is hidden in the driver 'esp-adf/components/au...
by krzychb
Wed Apr 25, 2018 10:46 am
Forum: Sample Code
Topic: why does esp32-lyrat running a2dp_sink example without output ?
Replies: 5
Views: 512

Re: why does esp32-lyrat running a2dp_sink example without output ?

mkseven32 wrote:i just curious about whether the GPIO setting is right or not?

please help me check it !


I2S GPIO assignment of the ESP32 LyraT is listed under https://esp-adf.readthedocs.io/en/lates ... header-jp4 and your setting for the three I2S signals is the same.
by krzychb
Tue Apr 24, 2018 11:05 am
Forum: Sample Code
Topic: why does esp32-lyrat running a2dp_sink example without output ?
Replies: 5
Views: 512

Re: why does esp32-lyrat running a2dp_sink example without output ?

Hi mkseven32,

mkseven32 wrote:when bt linked to smartphone, while playing muisc, there is a log shows bt is works fine, but there is not any voice out!


The ES8388 codec on board of ESP32 LyratT requires configuration.

Have you tried pipeline_bt_sink example instead?
by krzychb
Wed Apr 18, 2018 3:18 pm
Forum: Hardware
Topic: Digital To Analogue Converter Characteristics
Replies: 4
Views: 435

Re: Digital To Analogue Converter Characteristics

Hello mlibby, Hello, does any one know what is the DAC maximum output value? http://esp-idf.readthedocs.io/en/latest/api-reference/peripherals/dac.html#_CPPv218dac_output_voltage13dac_channel_t7uint8_t And for ADC what is the maximum input value? http://esp-idf.readthedocs.io/en/latest/api-reference...
by krzychb
Sat Apr 14, 2018 10:11 am
Forum: ESP32 IDF
Topic: Configure GPIO4 as ADC Input
Replies: 5
Views: 271

Re: Configure GPIO4 as ADC Input

GPIO12 is also one of dedicated JTAG pins.
If you plan to use JTAG then its operation will interfere with an application toggling DTR.
Apart from that I do not see issues with using GPIO12 as an output.
by krzychb
Fri Apr 13, 2018 2:31 pm
Forum: ESP32 IDF
Topic: Configure GPIO4 as ADC Input
Replies: 5
Views: 271

Re: Configure GPIO4 as ADC Input

Do you mean DTR (Data Terminal Ready) input to control serial communication? GPIO12 or MTDI is one of Strapping Pins and should be either pulled down or pulled up on power-on reset. External device connected to GPIO12 should not pull in opposite direction on power on reset, or ESP32 will likely fail...

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