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Device Specifications

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manaswis edited this page Mar 7, 2013 · 4 revisions

Specifications of the WSN Node

Openpicus Flyport Module

  1. Microchip PIC24FJ256 16bit MCU (see below for specifications)
  2. Transceiver 802.11 b/g/n Wi-Fi certified Microchip MRF24WB0MB

device1 device 2

Flyport Baseboard (Custom Made)

  1. Voltage Regulator LM7833 (TI) for 5V to 3V3 conversion

  2. Ambient Light Sensor APDS-9300 having I2C Interface (12-Bit) (Avago Technologies)

  3. Ambient Temperature Sensor DS18S20/DS18B20 having one wire Interface (12-Bit)(Maxim)

  4. PIR Motion Sensor (Digital O/P)

  5. Interface’s Available : Power (5V/3V3) , UART, ADC, SPI, GPIO

    device3

###PIC24FJ256GA106 Microcontroller Specifications

CPU

  • Up to 16 MIPS performance
  • 16 x 16 Hardware Multiply, Single Cycle Execution
  • 12-bit x 16-bit Hardware Divider

nanoWatt Power Managed Modes

  • Run, Idle and Sleep modes
  • Multiple, Switchable Clock Modes for Optimum Performance and Power Management
  • Run mode: 1 mA/MIPS, 2.0V Typical
  • Sleep mode Current Down to 100 nA Typical
  • Standby Current with 32 kHz Oscillator:2.5 uA,2.0V typical

Flash Program Memory

  • Self-Reprogrammable under Software Control
  • 10,000 erase/write cycles

System

  • Internal oscillator support - 31 kHz to 8 MHz, up to 32 MHz with 4X PLL
  • On-chip LDO Voltage Regulator
  • JTAG Boundary Scan and Flash Memory Program Support
  • Fail-Safe Clock Monitor – allows safe shutdown if clock fails
  • Watchdog Timer with separate RC oscillator

Analog Features

  • 10-bit ADC, 16 channels, 500k samples per second
  • Three Analog comparators

Peripherals

  • CTMU supports Capacitive Touch applications
  • Peripheral Pin Select allows I/O remapping of many peripherals in real time
  • 4xUART Modules with LIN and IrDA support, 4 Deep FIFO
  • 3xSPI ™ Modules with 8 Deep FIFO
  • 3xI2C™ Modules with Master and Slave Modes
  • Five 16-bit Timer Modules
  • Up to 9 Input Capture and 5 Output Compare/PWM with dedicated time base
  • Hardware RTCC, Real-Time Clock Calendar with Alarms
  • PMP, Parallel Master Port, with 16 Address Lines, and 8/16-bit Data

###Sensor Specifications

I. APDS9300 Ambient light Sensor

The APDS-9301 is Light-to-Digital Ambient Light Photo Sensor that converts light intensity to digital signal output capable of direct I2C interface. Each device consists of one broadband photodiode (visible plus infrared) and one infrared photodiode. Two integrating ADCs convert the photodiode currents to a digital output that represents the irradiance measured on each channel. This digital output can be input to a microprocessor where illuminance (ambient light level) in lux is derived using an empirical formula to approximate the human-eye response.

Features

  • Approximate the human-eye response
  • Precise Illuminance measurement under diverse lighting conditions
  • Programmable Interrupt Function with User-Defined Upper and Lower Threshold Settings
  • 16-Bit Digital Output with I2C Fast-Mode at 400 kHz
  • Programmable Analog Gain and Integration Time
  • Miniature ChipLED Package
    • Height – 0.55mm
    • Length – 2.60mm
    • Width – 2.20mm
  • 50/60-Hz Lighting Ripple Rejection
  • Typical 3.0V Input Voltage
  • Low Active Power (0.6 mW Typical) with Power Down Mode

spectral_response

II. Maxim DS18S20 Ambient Temperature Sensor

The DS18S20 digital thermometer provides 9-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20 communicates over a 1-Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. It has an operating temperature range of –55°C to +125°C and is accurate to 0.5C over the range of –10°C to +85°C. In addition, the DS18S20 can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply.

Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same 1-Wire bus. Thus, it is simple to use one microprocessor to control many DS18S20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.

III. PIR Motion Sensor

PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they are commonly found in appliances and gadgets used in homes or businesses. They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors.

PIRs are basically made of a pyroelectric sensor (which you can see above as the round metal can with a rectangular crystal in the centre), which can detect levels of infrared radiation. Everything emits some low level radiation, and the hotter something is, the more radiation is emitted. The sensor in a motion detector is actually split in two halves. The reason for that is that we are looking to detect motion (change) not average IR levels. The two halves are wired up so that they cancel each other out. If one half sees more or less IR radiation than the other, the output will swing high or low.

Block Diagram IIIT-Delhi WSN Node

WSN_Node_Block_Diagram

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