Hey, I am making the project with my Arduino uno where i use a NPK sensor which uses SPI interface and send the values to esp32 using nrf20l1 module using Spi interface how do the wiring also i need extra 4 pins left on board for relay and all 6 analog pins how to do please help me
Take a look at the first of the following links for how to use the ESP32 with multiple SPI devices. Suggest you first get one SPI device working. Then set it aside and get the other SPI device working. Then put the two together.
The second link shows how to use the analog pins.
To use RS485, you will need a board such in the following link (note it is for 3.3v use) and there are plenty of tutorials around that show how to use boards like that with the ESP32.
Not familiar with your board.
SPI is a bus and you can connect multiple devices to SCK, MOSI AND MISO; each device will have its own CS connected to a different pin on the ESP32. If you want to communicate with a device, you select it by activating its respective CS pin on the ESP32; once done, deselect the device by de-activating its CS.
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