WiFi Module - ESP8266 (4MB) (WRL-17146)

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The ESP8266 WiFi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266…

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Hi, I have a question about the ESP8266 WRL-17146 module. What is the pinout for SPI? The datasheet shows that pin 3 is SDA (SDI), what pin is SDO? Which pin is SCK?

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There is a very comprehensive answer here:
esp8266 - Can the ESP-1 use SPI to communicate with sensors? - Arduino Stack Exchange

ESP01 is very useful for driving relays over WiFi, or for reading single-wire sensors such as DHT11 temperature and humidity sensor. Beyond that level of functionality the small number of available GPIO pins becomes a severe limiting factor.


Welcome Jack!

Jeff has got your sorted for your answer using SPI.
What were you trying to interface with?

If you’re looking for a small ESP based board I’d check out the TinyPico. Great little board with lots of pins.