ESP8266 Community Forum

- Thu Nov 17, 2016 11:31 am #58260 Hey guys,
since I had no luck with current sensor and ADC, I bought MCP3201.

So here is config:

Code: Select allVref = 3.3V
IN+ = ADC reading (currently gnd)
IN- = GND
Vss = GND
Vdd = 3.3V

And here is sample code:

Code: Select alllocal MISO = 6              --> GPIO12
local CLK = 5               --> GPIO14
local CS = 8                --> GPIO15
local duration = 3000       --> 3 seconds
local result = 0

gpio.mode(CS, gpio.OUTPUT)
gpio.mode(CLK, gpio.OUTPUT)
gpio.mode(MISO, gpio.INPUT)



-- Function to read SPI
function readSPI()
    spi.setup(0, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, 8, 100)
    result = 0
   
    firstbyte = spi.recv(0, 8)
    secondbyte = spi.recv(0, 8)
   
    print (string.byte(firstbyte))
    print (string.byte(secondbyte))
end

readSPI()

But I always get 255 (firstbyte and secondbyte).

Any suggestion?

Thank you in advance.

PS I know I2C is way easier to use, but there is no ADC I2C chip available in my country right now.