Zachary J. Fields
Published © MIT

Remote Alerting Mailbox

You've already waited long enough to get your snail mail. Now use Blues + Pico + Twilio, so it doesn't just sit outside your door!

BeginnerShowcase (no instructions)4 hours1,199
Remote Alerting Mailbox

Things used in this project

Hardware components

Blues Wireless Notecard (Cellular)
Blues Wireless Notecard (Cellular)
×1
Blues Wireless Notecarrier-A
Blues Wireless Notecarrier-A
×1
Raspberry Pi Pico
Raspberry Pi Pico
×1
DFRobot Semi Flexible Monocrystalline Solar Panel (5V 1A)
×1
Battery, 3.7 V
Battery, 3.7 V
×1

Software apps and online services

Blues Wireless Notehub.io
Blues Wireless Notehub.io
SMS Messaging API
Twilio SMS Messaging API

Story

Read more

Custom parts and enclosures

Blues Notecarrier Pico Sidecar

Use it to clip a Raspberry Pi Pico (with female headers) to any Blues Notecarrier-A series.

Code

Blues Apollo

C/C++
#include <Notecard.h>
#ifdef ARDUINO_ARCH_ESP32
  #include <WiFi.h>
#endif

#define productUID "com.your-company.you:project"
#define serialDebug Serial

static const size_t SWITCH_PIN = 14;

Notecard notecard;

void setup() {
#ifdef ARDUINO_ARCH_ESP32
  // Disable radios to improve power profile
  WiFi.mode(WIFI_OFF);
  ::btStop();
#endif

  // Provide visual signal when the Host MCU is powered
  ::pinMode(LED_BUILTIN, OUTPUT);
  ::digitalWrite(LED_BUILTIN, HIGH);

  // Initialize Debug Output
  serialDebug.begin(115200);
  static const size_t MAX_SERIAL_WAIT_MS = 5000;
  size_t begin_serial_wait_ms = ::millis();
  while (!serialDebug && (MAX_SERIAL_WAIT_MS > (::millis() - begin_serial_wait_ms))) {
    ; // wait for serial port to connect. Needed for native USB
  }
  notecard.setDebugOutputStream(serialDebug);

  // Initialize Notecard
  notecard.begin();

  // Check alert latch
  ::pinMode(SWITCH_PIN, INPUT);
  if (::digitalRead(SWITCH_PIN)) {
    // Alert already sent
  } else {
    // Send mailbox alert

    // Activate alert latch
    ::pinMode(SWITCH_PIN, OUTPUT);
    ::digitalWrite(SWITCH_PIN, HIGH);
  
    // Configure Notecard to synchronize with Notehub periodically,
    // as well as adjust the frequency based on the battery level.
    {
      J * req = notecard.newRequest("hub.set");
      JAddStringToObject(req, "product", productUID);
      JAddStringToObject(req, "mode", "periodic");
      JAddStringToObject(req, "vinbound", "usb:10;high:360;normal:720;low:1440;dead:0");
      JAddStringToObject(req, "voutbound", "usb:10;high:180;normal:180;low:360;dead:0");
      notecard.sendRequest(req);
    }
  
    // Optimize voltage variable behaviors for LiPo battery
    {
      J * req = notecard.newRequest("card.voltage");
      JAddStringToObject(req, "mode", "lipo");
      notecard.sendRequest(req);
    }
  
    // Configure IMU sensitivity
    {
      J * req = notecard.newRequest("card.motion.mode");
      JAddBoolToObject(req, "start", true);
      JAddNumberToObject(req, "sensitivity", 2); // 3.904G
      notecard.sendRequest(req);
    }
  
    // Send Motion Detection Alert
    {
      J * req = notecard.newRequest("note.add");
      JAddBoolToObject(req, "sync", true);
      JAddStringToObject(req, "file", "mailbox.qo");
      JAddObjectToObject(req, "body");
      notecard.sendRequest(req);
    }
  }
}

void loop() {
  // Request sleep from loop to safeguard against tranmission failure, and
  // ensure sleep request is honored so power usage is minimized.
  {
    // Create a "command" instead of a "request", because the host
    // MCU is going to power down and cannot receive a response.
    J * req = NoteNewCommand("card.attn");
    JAddStringToObject(req, "mode", "arm,motion");
    notecard.sendRequest(req);
  }

  ::delay(3000);
}

BluesApollo

The Arduino firmware for the Raspberry Pi Pico, used to configure the Notecard to detect mailbox events.

Credits

Zachary J. Fields

Zachary J. Fields

16 projects • 137 followers
I like to make stuff.

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