433MHz frequency modulated wireless radio links were used to interconnect sensor network nodes. This article gives you an overview of a prototype wireless sensor network that has been successfully implemented as an undergraduate project Wireless Sensor Network with Low Power Consumption.

BIM2-433Mz


RADIOMETRIX: BiM2-433-160

The BiM2 transceiver is an enhanced replacement for the original BiM module. It offers greater transmit power, higher data rates, greatly improved receiver interference rejection and a lower profile.

The module is ideal for enabling bi-directional wireless connectivity in battery powered or handheld applications.

BiM2-433-160 – The sensor network wireless links were powered by 433MHz High Speed FM Radio Transceiver Module. These modules were driven by PIC microcontrollers.

Radiometrix

Pioneers of Low Power Radio - Since 1985

Based in the UK, Radiometrix is recognised as the leading global developer of ISM Band/ SRD FM low power radio modules.

Radiomatrix design and manufacture high-quality and cost-effective VHF and UHF radio modules that cater for the wireless needs of OEMs worldwide.

Available on all major frequencies (151, 169, 173, 433, 458, 868 & 914 MHz), Radiomatrix offer a wide variety of modules to suit a diverse range of licence-exempt and licenced applications.

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PIC18F4550

Base Station

PIC18F4550

The PIC18F4550 Base Station connects to a PC and allow the monitoring of the Wireless Sensor Network. The connection to the PC from the Base Station was realized via USB port. A Visual Basic Application was used on a Windows Operating System to monitor the Wireless Sensor Network.

nanoWatt Technology

Ideal for low power (nanoWatt) and connectivity applications that benefit from the availability of three serial ports: FS-USB(12Mbit/s), I²C™ and SPI™ (up to 10 Mbit/s) and an asynchronous (LIN capable) serial port (EUSART). Large amounts of RAM memory for buffering and Enhanced Flash program memory make it ideal for embedded control and monitoring applications that require periodic connection with a personal computer via USB for data upload/download and/or firmware updates.


PIC16F877

Sensor Nodes

PIC16F877 features 256 bytes of EEPROM data memory, self programming, an ICD, 8 channels of 10-bit Analog-to-Digital (A/D) converter, 2 additional timers, 2 capture/compare/PWM functions, the synchronous serial port can be configured as either 3-wire Serial Peripheral Interface (SPI™) or the 2-wire Inter-Integrated Circuit (I²C™) bus and a Universal Asynchronous Receiver Transmitter (USART). All of these features make it ideal for more advanced level A/D applications in automotive, industrial, appliances and consumer applications.

Microchip Technology

Microchip Technology Inc. is a publicly-listed American corporation that manufactures microcontroller, mixed-signal, analog and Flash-IP integrated circuits. Its products include microcontrollers (PIC, dsPIC, AVR and SAM), Serial EEPROM devices, Serial SRAM devices, embedded security devices, radio frequency (RF) devices, thermal, power and battery management analog devices, as well as linear, interface and wireless products.

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SHT11

Digital Humidity Sensor

All-round relative humidity sensor for any application. SHT11 digital humidity and temperature sensor is the all-round version of the reflow solderable humidity sensor series that combines decent accuracy at a competitive price. The capacitive humidity sensor is available up to high volumes and as every other sensor type of the SHTxx family, it is fully calibrated and provides a digital output.