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        • C
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      • PIC32
        • C
          • NECTO Studio
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        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
      • Universal Boards
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
          • Fusion for PIC v8
          • Fusion for ARM v8
        • 7th Generation
          • EasyPIC Fusion v7
        • 6th Generation
          • UNI-DS6
          • mikroBoard for PIC 80-pin
          • mikroBoard for AVR
          • mikroBoard for dsPIC
          • mikroBoard for PSoC
          • mikroBoard for 8051
          • mikroBoard for PIC 40-pin
          • mikroBoard for ARM
          • mikroBoard for ARM 144-pin
      • IoT - Wearable
        • Hexiwear
          • Hexiwear
          • Hexiwear Power User Pack
          • Hexiwear Docking Station
          • Hexiwear Battery Pack
          • Hexiwear Color Pack
          • Hexiwear Workstation
      • Analog Boards
        • 7th Generation
          • Analog System Lab Kit PRO
    • Starter Boards
      • PIC (8-bit)
        • Clicker
          • PIC clicker
        • Clicker 2
          • Clicker 2 for PIC18FJ
          • Clicker 2 for PIC18FK
        • Clicker 4
          • Clicker 4 for PIC18F
          • UNI Clicker
        • Ready
          • Ready for PIC Board
          • Ready for PIC (DIP28)
          • PIC-Ready2 Board
          • MMC Ready Board
        • StartUSB
          • StartUSB for PIC
      • dsPIC/PIC24 (16-bit)
        • Clicker 2
          • Clicker 2 for PIC24
          • Clicker 2 for dsPIC33
        • Clicker 4
          • UNI Clicker
        • Ready
          • dsPIC-Ready1 Board
          • dsPIC-Ready2 Board
          • DsPIC-Ready3 Board
          • dsPIC-Ready4 Board
      • PIC32 (32-bit)
        • Clicker
          • PIC32MX clicker
          • 6LoWPAN Clicker
          • PIC32MZ clicker
        • Clicker 2
          • Clicker 2 for PIC32MX
          • Clicker 2 for PIC32MZ
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-32 Board
          • MINI-32 for PIC32MZ
        • Flip&Click
          • Flip&Click PIC32MZ
      • ARM (32-bit)
        • Clicker
          • RA4M1 Clicker
          • Kinetis Clicker
          • MSP432 Clicker
          • CEC1702 clicker
          • CEC1302 Clicker
          • STM32 M4 clicker
        • Clicker 2
          • Clicker 2 for STM32
          • Clicker 2 for Kinetis
          • Clicker 2 for CEC1702
          • Clicker 2 for MSP432
          • Clicker 2 for CEC1302
          • Clicker 2 for PSoC 6
        • Clicker 4
          • Clicker 4 for STM32F745VG
          • Clicker 4 for STM32F4
          • Clicker 4 for TMPM3H
          • Clicker 4 for TMPM4K
          • Clicker 4 for STM32
          • UNI Clicker
        • MINI
          • MINI-M4 for STM32
          • MINI-M4 For Kinetis
          • MINI-M4 for Tiva
          • MINI-M4 for Stellaris
          • MINI-M4 for MSP432
          • MINI-M0 for STM32
        • Flip&Click
          • Flip&Click SAM3X
      • AVR (8-bit)
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-AT Board - 3.3V
          • MINI-AT Board - 5V
        • Ready
          • Ready for AVR Board
          • Ready For XMEGA
          • mikroXMEGA Board
          • AVR-Ready2 Board
        • StartUSB
          • StartUSB for AVR
      • 8051 (8-bit)
        • Ready
          • 8051-Ready Board
      • FT90x (32-bit)
        • Clicker 2
          • Clicker 2 for FT90x
      • Miscellaneous
        • USB
          • USB Wizard
          • Quail
          • FlowPaw Kit
      • Universal Boards
        • Clicker 4
          • UNI Clicker
    • Prog-Debug
      • PIC (8-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC
      • dsPIC/PIC24 (16-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
        • mikroProg
          • mikroProg for dsPIC
      • PIC32 (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC32
      • ARM (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP USB-C
          • CODEGRIP for ARM
          • CODEGRIP for ARM USB-C
          • CODEGRIP for STM32
          • CODEGRIP for KINETIS
          • CODEGRIP for Tiva
          • CODEGRIP for Tiva USB-C
        • mikroProg
          • mikroProg for STM32
          • mikroProg for Tiva
          • mikroProg for Kinetis
          • mikroProg for CEC
          • mikroProg for MSP432
          • mikroProg for PSoC 5LP
      • AVR (8-bit)
        • CODEGRIP
          • CODEGRIP for AVR
          • CODEGRIP for AVR - USB-C
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
        • mikroProg
          • mikroProg for AVR
      • 8051 (8-bit)
        • mikroProg
          • mikroProg for 8051
      • FT90x (32-bit)
        • mikroProg
          • mikroProg for FT90x
    • Smart Displays
      • 2.8"
        • ARM (32-bit)
        • AVR (8-bit)
        • dsPIC/PIC24 (16-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 3.5"
        • ARM (32-bit)
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        • PIC (8-bit)
        • PIC32 (32-bit)
      • 4.3"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC32 (32-bit)
      • 7"
        • ARM (32-bit)
        • FT90x (32-bit)
    • MCU Cards
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        • 8th Generation
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      • PIC32 (32-bit)
        • 8th Generation
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      • ARM (32-bit)
        • 8th Generation
        • 7th Generation
      • AVR (8-bit)
        • 8th Generation
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        • 8th Generation
    • Accessories
      • TFT Displays
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MikroElektronika white logo
  • Products
    • click boards icon Click Boards
      • Wireless Connectivity
        • GPS/GNSS
        • GSM/LTE
        • LTE IoT
        • BT/BLE
        • WiFi
        • RFID/NFC
        • GSM+GPS
        • 6LoWPAN
        • ZigBee
        • UWB
        • SigFox
        • Sub-1 GHz Transceievers
        • 2.4 GHz Trancevers
        • LoRa
        • WiFi+BLE
      • Sensors
        • Biometrics
        • Gas
        • Magnetic
        • Motion
        • Optical
        • Pressure
        • Proximity
        • Temperature & humidity
        • Current sensor
        • Miscellaneous
        • Environmental
        • Force
        • Inductance
        • RF meter
        • Click Shields
        • Click Bundles
      • Interface
        • Adapter
        • CAN
        • Port expander
        • RS485
        • USB
        • 1-Wire
        • RS232
        • Ethernet
        • LIN
        • PWM
        • Current
        • DALI
        • I2C
        • Fiber optics
        • SPI
        • DMX
        • CXPI
        • Click Shields
        • Click Bundles
      • Display & LED
        • LED Drivers
        • LED Matrix
        • LED Segment
        • OLED
        • LCD
        • TFT
        • Click Shields
        • Click Bundles
      • Miscellaneous
        • Relay
        • Optocoupler
        • ID
        • Proto
        • Encryption
        • Click Shields
        • Click Bundles
      • Mixed Signal
        • ADC
        • Measurements
        • DAC
        • Digital potentiometer
        • ADC-DAC
        • Click Shields
        • Click Bundles
      • Storage
        • EEPROM
        • FLASH
        • FRAM
        • microSD
        • MRAM
        • SRAM
        • EERAM
        • ReRAM
        • DRAM
        • Click Shields
        • Click Bundles
      • Motor Control
        • Brushed
        • Brushless
        • Servo
        • Stepper
        • Click Shields
        • Click Bundles
      • Audio & Voice
        • Amplifier
        • Microphone
        • Speakers
        • Signal Processing
        • Speech recognition
        • FM
        • MP3
        • Click Shields
        • Click Bundles
      • HMI
        • Capacitive
        • Pushbutton/Switches
        • Potentiometers
        • Rotary encoder
        • Haptic
        • Fingerprint
        • Click Shields
        • Click Bundles
      • Clock & Timing
        • RTC
        • Clock generator
        • Click Shields
        • Click Bundles
      • Power Management
        • Battery charger
        • Boost
        • Buck
        • Linear
        • Buck-Boost
        • Wireless Charging
        • Power Switch
        • USB-C PD
        • Click Shields
        • Click Bundles
      • Click Bundles
      • Click Shields
    • necto icon NECTO
      • NECTO Studio
    • compilers icon Compilers
      • PIC
        • C
          • NECTO Studio
          • mikroC PRO for PIC
        • Basic
          • mikroBasic PRO for PIC
        • Pascal
          • mikroPascal PRO for PIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • dsPIC/PIC24
        • C
          • NECTO Studio
          • mikroC PRO for dsPIC
        • Basic
          • mikroBasic PRO for dsPIC
        • Pascal
          • mikroPascal PRO for dsPIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • PIC32
        • C
          • NECTO Studio
          • mikroC PRO for PIC32
        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
          • mikroPascal PRO for PIC32
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • dev boards icon Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
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  1. Home
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  3. A DataLogger for All Occasions

A DataLogger for All Occasions

Published: 01/04/2016 | Post categories: Learn, Lets Make

| Views:5967

A DataLogger for All Occasions

We use data everyday and every place. It's almost impossible to exist in a modern society without generating a tremendous amount of data. So what do we use this data for? That's a huge question, but the simplified version of that would be to optimize our process and procedures. We do this to save time, money, lives, or energy. It has even become a saying that the currency of today is information. How we gain information is by converting raw data into something that is useful. Aka information. How to acquire data is done in multiple ways. It can be gathered by people but that tends to be flawed and time consuming. One of the better ways of gathering data is to have small micro-controllers do this task for us.

 

 

The concept is simple. Take a energy efficient device, put some expansions on it and have it gather data all day long. For example, you want to measure sun exposure during a typical day. Or, how about you want to measure the air quality in your restaurant throughout the day and relate it to customer satisfaction. These are all valuable uses of data and how to convert them to information. What is important for us today is how this code works and how could we use this code to generically do our own data logging.

Equipment used:

  • mikroMedia for XMEGA
  • Battery Boost Shield
  • SHT1X Sensor

LetsMakeDataLogger

The equipment isn't what is important, but the code is. The questions we need to answer are:

  • What information and how to mark the collection event
  • Where do we store the data
  • What format do we store it
  • How often do we collect the data
  • For how long do we need the data collected

How to Mark the Collection Event

On the XMEGA this is childs play. It just so happens that this little 8 bit monster has its own RTC. This answers the question of how to mark the event. The clearest event is one that is marked with a reference to day and time. In the example, initializing the RTC is done with:

// Set Real Time Clock: 1000ms, external clk, use interrupt
RTC16_Init(1000, _RTC_EXTERNAL_CLOCK, 1); 
RTC16_Start(); // Enables RTC operation

The source for the magic behind the RTC is found in the __Lib_Rtc.c  file included with the project.

How we get the time is by calling RTC16_Get_Time(); , but the example makes things very easy by passing the temp and humidity to a function called New_measurement(Ta_Res, RH_Res); which calls get time and places the new measurement onto the storage medium.

What you would probably want to do is keep the functions as generic as possible so that the application would be capable of supporting any type of sensor reading.

Where to Store it?

The most logical choice is one that is cheap, vast, and can be easily read or written to. On the mikroMedia the choice is pretty clear. Although flash memory does exist on board, to meet all of the criteria the clear winner is MicroSD. With FAT formatted memory the reading of the data becomes easy and convenient. With the ease of using the FAT32 library, data logging can be done in files. Not only can they be put in files but if there is a huge amounts of data, you can store them in separate files named for their date.

The example was written without use of FAT32. Although it still works fine as is, FAT32 comes with some advantages. How about larger files sizes? The biggest advantage is the ability to use much larger SD cards without the need to re-partition and format.

Another consideration is when you have wireless or wired network connectivity. When this is available, writing to flash might be inconvenient. This all depends on your environment.

For the FAT32 library - You will find it on Libstock.com

Although the New_measurement(Ta_Res, RH_Res); takes care of the writing to the medium, your choice might be to separate the writing of the data until another time or when a buffer is filled. Inside the _MMC.c  file included with the project is where all the MMC media action happens.

void MMC_WriteJK( char *datetime, char *temperature, char *humidity ){
    // Construct variables needed for data logging
    char txt[50];
    char tmptxt[6];
    char comma[3] = " ,";
    char crlf[3] = "rn";
    // Construct the string to be written to SDCard
    txt[0] = 0;
    strcat(txt, datetime);
    strcat(txt, comma);
    strcat(txt, temperature);
    strcat(txt, comma);

    strcat(txt, humidity);
    strcat(txt, crlf);

    if (MMC_Check_For_SDcard() == 0) { // Check for SDCard presents
        SR_flg++;
        if (SR_flg == 2){
        Mmc_Fat_Assign(filename,0xA0); // Assign existing file
        Mmc_Fat_Append(); // Add new data at the end of the file
        Mmc_Fat_Write(txt,strlen(txt));// Write the string to flash

What Format do we Store it?

In the example each date / time, temperature and humidity is stored on a single, new line in the file. Each field is separated by a comma. In most cases this is a valid approach to data logging. Having the data in a CSV or Coma Separated Value file is quite convenient due to ease when importing into Excel, Libre Calc, or even visualization tools. Another option that is beyond this review but one I enjoy is the ability to data log directly to an SQL database. A discussion for another time.

How Often do we Collect the Data?

This is highly dependent on the question of how much data will I need to make this into useful information? Do you need 1 measurement per hour or 100,000 per second? In the example they are data logging every second. How I can tell is the by the following line in project.c :

if (old_seconds != t.sec){ // Occurs every new second
    old_seconds = t.sec;
    // data logging magic here

Every second that changes the measurements are taken and written to the medium. For temp and humidity this might be a little too often. For instance, if I were going to place this unit on a motor to measure its vibration and torsion I would want this measurement to be at least 100 x per second if I were looking for low resonance vibrations. You know, they kind that break motors. If I were looking for more of the higher frequency vibrations that loosen nuts and bolts on a motor I might be wanting 20,000 x per second. It's all up to the question you are trying to answer.

Another consideration is power. The more often you measure, the more often you'll be replacing batteries. Power is always a consideration with running on 2 AA batteries.

For How Long do we Need the Data Collected?

Another subjective question but one that can be answered in another question. How many events do I need to sufficiently prove the occurrence of a condition or event? The more rare the occurrence the longer the measurement time. If you are looking for that event that happens once a week, your data logging will need to be long enough to capture several of those events in order to prove a re-occurring trend. 1 event usually isn't enough data to prove real information.

Lastly, consider the storage requirement when data collection periods are high and data collection frequency is high as well.

In the example:

  • collection is 1/sec
  • 3 pieces of data are collected with a total of 32 bytes per log
    • Data time "28/03/2016 14:15:23," is 20 bytes
    • Temperature "28.2," is 5 bytes
    • Humidity "45.5," is 5 bytes
    • "/r/n" is 2 bytes

Let's consider a 24 hour period, 24 hours x 60 min x 60 sec = 86,400 samples per day x 32 bytes per sample = 2.76 Mb

But... if you were going to collect 10,000 of these samples per second.

86,400 x 10,000 = 864,000,000 x 32 bytes = 27,648,000,000 or 27.6 Gb oh my.

Additional Features

The additional information that you get with the Make project is the fact that visual feedback of the data is displayed on a TFT. This can be advantageous if you are using your data in a more immediate way. Think oscilloscope or the word meter. Even short periods of data logging can be useful.

A DataLogger for All Occasions sound pressure

Summary

With the world overflowing in data, let's add to the ocean by collecting the data that is useful for your own purposes. A microcontroller is the easiest and most cost efficient way of collecting, storing, and retrieving data from. Picking a strategy for data logging is like picking the right tool for any job. Power, sensors, and storage are the primary questions that will determine the appropriate equipment.

References

Libstock

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