Datasheet

2. UIFlow
Schematic
#include <M5Stack.h>
// declaration
int cur_value_red = 0;
int cur_value_blue = 0;
// initialization
M5.begin();
pinMode(26, INPUT);// Red Button Pin setting
pinMode(36, INPUT);// Blue Button Pin setting
// read data
cur_value_red = digitalRead(26);
cur_value_blue = digitalRead(36);
M5.update();
M5Stack Docs