Digilent Nexys Spartan FPGA – Humidity and Temperature Sensor in $50

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Digilent Nexys Spartan FPGA – Humidity and Temperature Sensor in $50

FSM drawing

Features

The final product has the following features:

  • Displays the current temperature and humidity on the board in a user-friendly manner
  • Data recorded by the device is viewable on a PC in a user-friendly manner .
  • User can set ranges for both temperature and humidity and an audible alarm sounds if conditions go outside this range
  • PC software allows remote control over the board via the USB connection

Tasks

The combination of requirements and equipment provides several major areas of development:

  • Circuit design for external sensors and power supply
  • FPGA design, split into two areas:
    • Standard FPGA Logic hardware such as state machines etc.
    • Processor software
  • PC Software design for communication to the board and display of data.

Specifications

The final product has the following specifications:

  • The device operates in two modes.  The first is a single sample mode (AKA Snapshot mode):
    • When activated, the device takes a single immediate reading from the environmental sensors and stores and displays a single result for each measurement.
    • A time-stamp showing how long the device has been in operation is stored with each sample.
  • The second mode is an automated repeated sampling mode (AKA Stream mode):
    • Can be activated or deactivated at any time.
    • Recordings are taken at a rate of 5 times per second.
    • The device is able to store up to 30 minutes of data before downloading to the PC.
  • There is also an alarm that can be triggered under certain conditions
    • The acceptable range of normal temperature/humidity is settable via the hardware
    • If a sample is taken outside of this range in either mode, an alarm goes off.
    • The user can suppress or stop the alarm
    • The device continues operating even while sounding an alarm
  • Both modes of the device can be activated from both the software and the hardware alone.
  • Temperature and humidity resolution are as accurate as possible within the budget level.

Snapshot Stream

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