Hall Magnetic Sensor Brick

// Hall Magnetic Sensor Brick (TP-K03): quick start
// Reads the brick and shows the value on the TinkerPie matrix and in the Serial Monitor (115200 baud).
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitSensor s;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!s.begin()) Serial.println("Hall Magnetic Sensor Brick not found at 0x08: check the cable to SENSOR 1-4");
}

void loop() {
  bool level = s.state();            // the S pin, debounced
  uint8_t n = s.events();            // how many times it fired (counts up, wraps at 255)
  Serial.printf("S = %d   events = %u\n", level, n);
  if (level) led::fill(Colors::Green); else basic::clearScreen();
  basic::pause(100);
}

// Wheel speed meter: Hall Magnetic Sensor Brick (TP-K03)
// Glue a small magnet on a wheel and hold the Hall sensor next to it. Every pass is one turn: TinkerPie shows the turns per minute.
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitSensor hall;
uint8_t last = 0;
uint32_t t0 = 0;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!hall.begin()) Serial.println("Hall Magnetic Sensor Brick not found at 0x08: check the cable to SENSOR 1-4");
  last = hall.events(); t0 = millis();
}

void loop() {
  if (millis() - t0 >= 3000) {
    uint8_t n = hall.events();
    uint8_t turns = n - last;            // events count up and wrap at 255, so subtracting works
    last = n; t0 = millis();
    Serial.printf("%u RPM\n", turns * 20);
    basic::showNumber(turns * 20, Colors::Cyan);
  }
  basic::pause(20);
}