Marvin

See also: MTCDT (Ethernet/LoRa gateway)

Some kind of LoRa device http://www.rdmmakerspace.nl/Marvin/

Source code here: https://github.com/iotacademy/marvin

The device is a bare PCB with a USB on one end. Plugging this in to a computer shows up as a Arduino Leonardo and can be reprogrammed as such from the Arduino IDE. There is also a micro usb connection presumably duplicating the male PCB connector.

Docs

Note that this version varies from original kickstarter project, it uses the Microchip RN2903 at 915 Mhz for US.

Datasheet: http://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en578921 (available from digikey and others for < $15)

Command Refernce: http://ww1.microchip.com/downloads/en/DeviceDoc/40001811A.pdf

Pics

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Sketch

This is a basic sketch that allows for interaction over serial sys ver for example returns the firmware version. Connection can be made using arduino serial monitor or any serial terminal program with configuration set to 57,600bps 8N1, all messages must end with <CR> + <LF>.

/*

  Marvin Hello

    VER: RN2903 0.9.8 Feb 14 2017 20:17:03

*/

// LoRa module params
const int RESET_PORT = 5;
const int POWER_PORT = 6;

int sensorPin = A3;    // select the input pin for the potentiometer
int pirPin = 4;
int ledA = 13;      // select the pin for the LED
int ledB = 11;
int sensorValue = 0;  // variable to store the value coming from the sensor

unsigned long lastTime = 0;
unsigned long nextTime = 1;

void setup() {
  pinMode(ledA, OUTPUT);
  pinMode(ledB, OUTPUT);
  pinMode(pirPin, INPUT);

  // Virtual Serial thru USB connection
  Serial.begin(57600);
  // Leonardo UART to RN2903A module
  Serial1.begin(57600);
  // wait to init
  while (!Serial) {
    // twiddle thumbs here
  }

  // Enable power to the RN2483
  pinMode(POWER_PORT, OUTPUT);
  digitalWrite(POWER_PORT, HIGH);
  
  Serial.println(">> Powering Module");
  delay(1000);

  // Disable reset pin
  pinMode(RESET_PORT, OUTPUT);
  digitalWrite(RESET_PORT, HIGH);
}

void loop() {
  static bool blinkOn = false;

  // proxy data between USB/Serial & Module/Serial
  if (Serial1.available() > 0)
    Serial.write(Serial1.read());
  if (Serial.available() > 0)
    Serial1.write(Serial.read());

  // Turn on LED when there's motion
  digitalWrite(ledB, !digitalRead(pirPin));
  
  // Serial.println(sensorValue);

  if (millis() >= nextTime) {
    // read the value from the sensor:
    sensorValue = analogRead(sensorPin);
    nextTime = millis() + sensorValue;
    if (!blinkOn) {
      digitalWrite(ledA, LOW);
      //analogWrite(ledA, int(sensorValue / 4));
    } else {
      // analogWrite(ledA, 0);
      digitalWrite(ledA, HIGH);
    }
    blinkOn = !blinkOn;
    lastTime = millis();
  }

  delay(20);
}