An Introduction To Squirrel Applications Example 7
In this example we will create a remote monitoring application that takes asynchronous sensor readings using the Promise library and detects freefall events. We will conserve power by putting the device to sleep between readings. The device will connect periodically to send readings and will also wake and connect if a freefall is detected. This code can be easily configured for use with an imp006 Breakout Kit, impExplorer Kit, impAccelerator Battery Powered Sensor Node or impC001 Breakout Board.
Advanced
This example will focus on writing Squirrel code. Please visit the Getting Started Guide on the Electric Imp Dev Center to learn how to configure your device with BlinkUp™ and how to use the Electric Imp IDE, impCentral™.
.HAL.nut file in the repository that matches your hardware.
// HARDWARE ABSTRACTION LAYER
// ---------------------------------------------------
// HAL's are tables that map human readable names to
// the hardware objects used in the application.
// Copy and Paste Your HAL here
ExplorerKit_001 <- {
"LED_SPI" : hardware.spi257,
"SENSOR_AND_GROVE_I2C" : hardware.i2c89,
"TEMP_HUMID_I2C_ADDR" : 0xBE,
"ACCEL_I2C_ADDR" : 0x32,
"PRESSURE_I2C_ADDR" : 0xB8,
"POWER_GATE_AND_WAKE_PIN" : hardware.pin1,
"AD_GROVE1_DATA1" : hardware.pin2,
"AD_GROVE2_DATA1" : hardware.pin5
}
// REMOTE MONITORING INTERRUPT APPLICATION CODE
// --------------------------------------------------------
// Application code, take readings from our sensors
// and send the data to the agent
class Application {
// Time in seconds to wait between readings
static READING_INTERVAL_SEC = 30;
// Time in seconds to wait between connections
static REPORTING_INTERVAL_SEC = 300;
// Max number of stored readings
static MAX_NUM_STORED_READINGS = 20;
// Time to wait after boot before disconnecting
static BOOT_TIMER_SEC = 60;
// Accelerometer data rate in Hz
static ACCEL_DATARATE = 10;
// Hardware variables
i2c = ExplorerKit_001.SENSOR_AND_GROVE_I2C; // Replace with your sensori2c
tempHumidAddr = ExplorerKit_001.TEMP_HUMID_I2C_ADDR; // Replace with your tempHumid i2c addr
accelAddr = ExplorerKit_001.ACCEL_I2C_ADDR; // Replace with your accel i2c addr
wakePin = ExplorerKit_001.POWER_GATE_AND_WAKE_PIN; // Replace with your wake pin
// Sensor variables
tempHumid = null;
accel = null;
// Message Manager variable
mm = null;
// Flag to track first disconnection
_boot = true;
constructor() {...}