Wireless Sensor Networks Design for Radio-Triggered Wake up Sensor

Wireless Sensor Networks design for radio-triggered wake up Sensor

Objective To design a low power sensor network that receives radio signals from a transmitter and wakes up from its sleep mode to transmit data back. The device should be powered by the PIC processor and use minimum power.

Basic Power Management in the Circuit In the wake up period, the node listens to incoming radio packets which are electromagnetic waves and chooses to go back to sleep or stay awake based on the content of packet. The aim is to avoid useless wake up periods and designed such that it should wake up only when a special signal is sent by another node.

Steps required for accomplishing the goal 1. Research all the possible designs required to accomplish the task 2. Make a list of the required components and analyze their effect on the circuit. 3. Simulate the circuit design and test the functionality 4. Start building the circuit.

This figure shows one of the designs that would help make a wireless sensor network for radio-triggered wake up Sensor

Figure 1

This is a PIC processor – one of the major components of the circuit this is connected to the V1 shown in the schematic above. It has many interrupt pins, one of which gets lifted when a particular voltage had been reached.

Figure 2 This figure is a modified version of figure 1.This circuit includes a capacitor parallel to an op-amp. This acts an integrator and accumulates charges on the capacitor and builds voltage across it.

Figure 3