ESP 12 unusable pins

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The ESP 12 board has 22 pins enter image description here



Are all of them usable?



I understand that there is an external flash memory that is accessed through SPI, but I'm not sure what the impact on the pins is.



And if it is so, then why are the pins available?



Is there a sort of a decoder board that receive as an input, let's say 3 SPIOs and outputs 8 GPIOs?



Is there a way to obtain more GPIO pins?






esp8266 pins







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  • Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
    – CrossRoads
    1 hour ago














up vote
1
down vote

favorite












The ESP 12 board has 22 pins enter image description here



Are all of them usable?



I understand that there is an external flash memory that is accessed through SPI, but I'm not sure what the impact on the pins is.



And if it is so, then why are the pins available?



Is there a sort of a decoder board that receive as an input, let's say 3 SPIOs and outputs 8 GPIOs?



Is there a way to obtain more GPIO pins?






esp8266 pins







share|improve this question







New contributor




Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
    – CrossRoads
    1 hour ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











The ESP 12 board has 22 pins enter image description here



Are all of them usable?



I understand that there is an external flash memory that is accessed through SPI, but I'm not sure what the impact on the pins is.



And if it is so, then why are the pins available?



Is there a sort of a decoder board that receive as an input, let's say 3 SPIOs and outputs 8 GPIOs?



Is there a way to obtain more GPIO pins?






esp8266 pins







share|improve this question







New contributor




Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











The ESP 12 board has 22 pins enter image description here



Are all of them usable?



I understand that there is an external flash memory that is accessed through SPI, but I'm not sure what the impact on the pins is.



And if it is so, then why are the pins available?



Is there a sort of a decoder board that receive as an input, let's say 3 SPIOs and outputs 8 GPIOs?



Is there a way to obtain more GPIO pins?






esp8266 pins




esp8266 pins






share|improve this question







New contributor




Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






New contributor




Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









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Mihai Ionuţ-Cosmin

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New contributor





Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Mihai Ionuţ-Cosmin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
    – CrossRoads
    1 hour ago
















  • Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
    – CrossRoads
    1 hour ago















Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
– CrossRoads
1 hour ago




Like this one? researchdesignlab.com/esp8266-esp-12-breakout-board.html
– CrossRoads
1 hour ago










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The flash memory is connected to io 6 to io 11 if it is connected in QIO mode. DIO mode lets two of the pins free. According to Arduino core reference the two pins are 9 and 11. The flash pins are labeled SD and most of them are the first SPI interface of the esp8266. You can't use this SPI pins as digital pins, but supposedly you can connect another SPI device.



Some of the esp8266 'free' pins have some restrictions. Boot configuration pins io 0, io 2 and io 15 need to have some state at boot. io2 not LOW, io 15 LOW and with io 0 flashing mode is activated. The A0 is ADC only pin. And you can't count power, EN, Reset and ground as 'pins'.



You can use a multiplexer or an I2C expansion board to get more pins.






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    The flash memory is connected to io 6 to io 11 if it is connected in QIO mode. DIO mode lets two of the pins free. According to Arduino core reference the two pins are 9 and 11. The flash pins are labeled SD and most of them are the first SPI interface of the esp8266. You can't use this SPI pins as digital pins, but supposedly you can connect another SPI device.



    Some of the esp8266 'free' pins have some restrictions. Boot configuration pins io 0, io 2 and io 15 need to have some state at boot. io2 not LOW, io 15 LOW and with io 0 flashing mode is activated. The A0 is ADC only pin. And you can't count power, EN, Reset and ground as 'pins'.



    You can use a multiplexer or an I2C expansion board to get more pins.






    share|improve this answer


























      up vote
      2
      down vote













      The flash memory is connected to io 6 to io 11 if it is connected in QIO mode. DIO mode lets two of the pins free. According to Arduino core reference the two pins are 9 and 11. The flash pins are labeled SD and most of them are the first SPI interface of the esp8266. You can't use this SPI pins as digital pins, but supposedly you can connect another SPI device.



      Some of the esp8266 'free' pins have some restrictions. Boot configuration pins io 0, io 2 and io 15 need to have some state at boot. io2 not LOW, io 15 LOW and with io 0 flashing mode is activated. The A0 is ADC only pin. And you can't count power, EN, Reset and ground as 'pins'.



      You can use a multiplexer or an I2C expansion board to get more pins.






      share|improve this answer
























        up vote
        2
        down vote










        up vote
        2
        down vote









        The flash memory is connected to io 6 to io 11 if it is connected in QIO mode. DIO mode lets two of the pins free. According to Arduino core reference the two pins are 9 and 11. The flash pins are labeled SD and most of them are the first SPI interface of the esp8266. You can't use this SPI pins as digital pins, but supposedly you can connect another SPI device.



        Some of the esp8266 'free' pins have some restrictions. Boot configuration pins io 0, io 2 and io 15 need to have some state at boot. io2 not LOW, io 15 LOW and with io 0 flashing mode is activated. The A0 is ADC only pin. And you can't count power, EN, Reset and ground as 'pins'.



        You can use a multiplexer or an I2C expansion board to get more pins.






        share|improve this answer














        The flash memory is connected to io 6 to io 11 if it is connected in QIO mode. DIO mode lets two of the pins free. According to Arduino core reference the two pins are 9 and 11. The flash pins are labeled SD and most of them are the first SPI interface of the esp8266. You can't use this SPI pins as digital pins, but supposedly you can connect another SPI device.



        Some of the esp8266 'free' pins have some restrictions. Boot configuration pins io 0, io 2 and io 15 need to have some state at boot. io2 not LOW, io 15 LOW and with io 0 flashing mode is activated. The A0 is ADC only pin. And you can't count power, EN, Reset and ground as 'pins'.



        You can use a multiplexer or an I2C expansion board to get more pins.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 33 mins ago

























        answered 1 hour ago









        Juraj

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