ESP8266 Community Forum

- Sun Jun 14, 2015 4:07 pm #20472

BE sure to change the CS pin because the ESP8266 standard CS pin is IO15 which always has to be connected to ground!(in this case change it to 2)

I was wondering about this . Did you make a mistake?GPIO15 pin is not a chip select pin as far as I know . It is the MTDO pin used to boot the chip into a SDIO mode which no-one seems to know much about yet . Its a slave mode for SPI I think though

I think you can use any pin that will go high to act as CS (Chip Select) pin

Get you modules here:

https://www.banggood.com/custlink/KvGGhGF4wG

- Sun Jun 14, 2015 11:57 pm #20485 Hi,
when you look on the pin table from the Repository:

(From:https://raw.githubusercontent.com/Links2004/Arduino/esp8266/docs/pin_functions.png)

You can see that Function 2 of IO15 is HSPICS.

To boot the esp normaly, you need to connect IO15 to Ground. Nearly every espboard has it's io 15 connected to ground. Excluding my esp8266 201, where I had to solder wires on.

Last edited by sigrokBlack on Sat May 30, 2020 5:16 pm, edited 1 time in total.

- Mon Jun 15, 2015 8:35 am #20506 Here is a quick schematic I've wrote:

Connections.png

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- Mon Jun 15, 2015 1:12 pm #20519 You could do with some 10K resistores on some lines and GPIO15 if broken out should be pulled low via a 10K resistor to ensure the chip does not go into SDIO mode.
See the wiki above for circuits and info

Get you modules here:

https://www.banggood.com/custlink/KvGGhGF4wG