Knock Sensor Brick

// Knock Sensor Brick (TP-K19): 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("Knock 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);
}

// Secret knock lock: Knock Sensor Brick (TP-K19)
// Knock three times within two seconds to unlock: a servo on S1 turns and the matrix shows a tick.
#include <TinkerPie.h>
#include <TinkerPieBricks.h>
using namespace tinkerpie;

tpb::KitSensor knock;
uint8_t last = 0;
int knocks = 0;
uint32_t firstAt = 0;

void setup() {
  Serial.begin(115200);
  tinkerpie::begin();            // also starts the SENSOR ports (I2C bus Wire1)
  if (!knock.begin()) Serial.println("Knock Sensor Brick not found at 0x08: check the cable to SENSOR 1-4");
  last = knock.events();
  servos::setAngle(ServoPort::S1, 0);
}

void loop() {
  uint8_t n = knock.events();
  if (n != last) { last = n; if (knocks == 0) firstAt = millis(); knocks++; music::playTone(800, 30); }
  if (knocks > 0 && millis() - firstAt > 2000) {
    if (knocks == 3) { basic::showIcon(IconNames::Yes, Colors::Green); servos::setAngle(ServoPort::S1, 90); basic::pause(3000); servos::setAngle(ServoPort::S1, 0); }
    else basic::showIcon(IconNames::No, Colors::Red);
    basic::clearScreen(); knocks = 0;
  }
  basic::pause(10);
}