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I wonder if I can use SPI to communicate between ESP-1 ESP8266 module and SPI sensors and other slaves.

If so, do I need to install a library?

  • sure it can - do you know how to use a soldering iron? esp8266 arduino framework comes with SPI library, so, you won't need to install one – Jaromanda X Jan 15 at 0:46
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ESP-01 was designed as WiFi network adapter, not as a controller board. The are 4 pins on esp-01. RX (io 3), TX (io 1), io 0 and io 2.

SPI requires 3 pins: clock, MISO, MOSI plus one pin for every device connected to the bus. So you could in theory use one SPI device on this 4 pins. The esp8266 Arduino SPI library works only with hardware SPI on esp8266 pins io 12, 13, 14 so you would have to use some software SPI implementation for esp8266.

To connect sensors, actuators or display to the esp-01, I2C is a feasible option. It requires only two digital pins and the esp8266 Arduino Wire library can work on any pair of io pins.

To use esp8266 as MCU with Arduino, there are many development boards with all usable pins broken out (9 pins) and USB chip for simple connection to computer and flashing (Wemos, NodeMCU). Or you can use an esp8266 module with more or all pins of the esp8266 (esp-07, esp-12).

  • Thanks. Do you know any software spi library that might work? – harelabb Jan 15 at 15:59

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