Arduino library for MCP3008 ADC (using hardware SPI)
#include <SPI.h>
#include <MCP3008.h>
#define CS_PIN A5 //A5 is convenient on Feather boards, choose any pin you like.
MCP3008 mcp = MCP3008(CS_PIN);
void setup() {
SPI.begin();
mcp.begin();
}
void loop() {
int v0 = mcp.readADC(0);
}