Category Archives: Computers

TempMonHTTP

For a while I’ve been tinkering around with a simple project – an Arduino-based temperature (and humidity) monitor that outputs a webpage on my home LAN. The Arduino I used was the Freetronics EtherTen, a quality product.

Screenshot of the TempMonHTTP webpage. Yes, it gets hot in my walk in robe where the home LAN switch is…

Check out the code at https://github.com/gjhmac/TempMonHTTP.

Ahead of their time…

One of my tasks as an undergraduate in the engineering firm I was working at was to look after the website. Back then knowing a little HTML and how to use FTP wasn’t as common as it is now.

The web hosting company we used provided quite detailed logs for all of our virtual visitors. By looking at the IP addresses in the logs it was possible to speculate (the key word here being speculate) which company the visitor worked at.

Our sales and marketing guy caught wind of these logs and suggested we send emails to the companies we suspected had had one of their employees visit our site asking if we could be of any assistance or if they required any further information.

I explained that a) we didn’t 100% know that they had visited and b) this raised all sorts of privacy issues. Plus to me this sort of practice was creepy and not how the Internet was supposed to work.

How naive was I?

New Year, New Kit Update

The new iPad (iPad 6th Generation (128GB)) has been fantastic. I’m now hanging out for some of the goodies promised in iOS 13 (or iPadOS as it may be)…

Unfortunately I can’t say the same about the keyboard/case I selected to go with it (Logitech Slim Folio iPad Keyboard Case). Firstly, the top part of the keyboard seemed to rub on the iPad screen (thankfully only damaging the screen protector). Secondly, the keys are quite fragile and it wasn’t long before one had popped off after the mechanism had broken. To be fair I may have gotten unlucky, plenty of other people online recommend this keyboard/case.

After abandoning the keyboard/case I purchased an STM case and an external Logitech K380 Bluetooth keyboard. Both are going well.

[Part 7] Arduino Data Logger

// ————————————————————————————————————————————————
// Project:   DataLogger
// Version:   0.4
// Date:      26 August 2018
// Author:    Greg Howell <gjhmac@gmail.com>
// ————————————————————————————————————————————————
// Version    Date              Comments
// 0.4        26 August 2018    Modified code to only log to the SD card if the new value is different to the old value
// 0.3        30 June 2018      Added debugging and diagnostics on serial port, sped up ADC for analogue read (128kHz -> 1MHz), fixed “A REF”
// 0.2        26 April 2018     Addition of switch to enable/disable logging to SD card and LED to indicate logging status
// 0.1        17 February 2018  Initial Development
//
// ————————————————————————————————————————————————
// Description:
//  – Logs analog0 value to a text file on the SD card along with date/time stamp in CSV format
//  – Maintains date/time via DS1302 Real Time Clock
//  – Builds with Arduino 1.8.5
// ————————————————————————————————————————————————

// #includes
#include <SPI.h>    // Serial Peripheral Interface
#include <SD.h>     // SD Cards
#include <DS1302.h> // DS1302 RTC

const int chipSelect = 4;
const int buttonPin = 5;  // Pin 5 is the button to enable/disable logging (digital input)
const int ledPin =  6;    // Pin 6 is the LED indicate logging status (digital output)

const byte PS_128 = (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
const byte PS_16 = (1 << ADPS2);

int buttonState = 0;      // initialise button state to off
int oldsensor;            // variable to store the previous sensor value (used in loop())

// Init the DS1302
// Pin 2 = RST
// Pin 3 = DAT
// Pin 4 = CLK
DS1302 rtc(2, 3, 4);
// ————————————————————————————————————————————————
// setup()
// ————————————————————————————————————————————————
void setup() {

  ADCSRA &= ~PS_128;  // remove prescale of 128
  ADCSRA |= PS_16;    // add prescale of 16 (1MHz)

  analogReference(EXTERNAL);  // Analogue reference set to “A REF” pin

  pinMode(buttonPin, INPUT);  // Initialize the pushbutton pin as an input
  pinMode(ledPin, OUTPUT);    // Initialize the LED pin as an output

  rtc.halt(false);            // Set the clock to run-mode
  rtc.writeProtect(false);    // and disable the write protection

  Serial.begin(9600);

  // Use following lines once to set clock if battery fails (modify to suit)
  //rtc.setDOW(SUNDAY); // Set Day-of-Week to FRIDAY
  //rtc.setTime(21, 50, 0); // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(26, 8, 2018); // Set the date to August 6th, 2010

  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // Print current system date from RTC at start up
  Serial.print(“System date: “);
  Serial.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()));

  Serial.print(“Initializing SD card…”);

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println(“Card failed, or not present”);
    // don’t do anything more:
    while (1);
  }
  Serial.println(“card initialized.”);
}
// ————————————————————————————————————————————————
// loop()
// ————————————————————————————————————————————————
void loop() {
  String dataString = “”;                 // make a string for assembling the data to log
  int sensor = analogRead(A0);            // read analogue
  dataString += String(sensor);           // construct string with analogue signal
  buttonState = digitalRead(buttonPin);   // read button state

  // Logging enabled
  if (buttonState == HIGH) {
    File dataFile = SD.open(“datalog.txt”, FILE_WRITE);

    // if the file is available, write to it
    if (dataFile) {

      // if the new data is different to the old data write it to file
      if (sensor != oldsensor) {
        // Write data to serial output
        Serial.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()) + “,” + dataString);
        Serial.println(String(sensor) + “,” + String(oldsensor));
        // Write data to SD card
        dataFile.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()) + “,” + dataString);
        dataFile.close();
      }
      else {
        dataFile.close();
      }
    // set logging LED to high
    digitalWrite(ledPin, HIGH);
  }
  // if the file isn’t open, print an error
  else {
    digitalWrite(ledPin, LOW);
    Serial.println(“error opening datalog.txt”);
  }
}
  // Logging disabled
  else {
    // set logging LED to low
    digitalWrite(ledPin, LOW);
  }
  // set the old sensor value to the current sensor value (read at top of loop())
  oldsensor = sensor;
  // Wait before repeating 🙂
  delay (500);
}

[Part 6] Arduino Data Logger

// ————————————————————————————————————————————————
// Project:   DataLogger
// Version:   0.3
// Date:      30 June 2018
// Author:    Greg Howell
// ————————————————————————————————————————————————
// Version    Date              Comments
// 0.3        30 June 2018      Added debugging and diagnostics on serial port, sped up ADC for analogue read (128kHz -> 1MHz), fixed “A REF”
// 0.2        26 April 2018     Addition of switch to enable/disable logging to SD card and LED to indicate logging status
// 0.1        17 February 2018  Initial Development
//
// ————————————————————————————————————————————————
// Description:
//  – Logs analog0 value to a text file on the SD card along with date/time stamp in CSV format
//  – Maintains date/time via DS1302 Real Time Clock
//  – Builds with Arduino 1.8.5
// ————————————————————————————————————————————————

// #includes
#include    // Serial Peripheral Interface
#include     // SD Cards
#include // DS1302 RTC

const int chipSelect = 4;
const int buttonPin = 5;  // Pin 5 is the button to enable/disable logging (digital input)
const int ledPin =  6;    // Pin 6 is the LED indicate logging status (digital output)

const byte PS_128 = (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
const byte PS_16 = (1 << ADPS2);

int buttonState = 0;      // initialise button state to off

// Init the DS1302
// Pin 2 = RST
// Pin 3 = DAT
// Pin 4 = CLK
DS1302 rtc(2, 3, 4);
// ————————————————————————————————————————————————
// setup()
// ————————————————————————————————————————————————
void setup() {
  
  ADCSRA &= ~PS_128;  // remove prescale of 128
  ADCSRA |= PS_16;    // add prescale of 16 (1MHz)

  analogReference(EXTERNAL);  // Analogue reference set to “A REF” pin
  
  pinMode(buttonPin, INPUT);  // Initialize the pushbutton pin as an input
  pinMode(ledPin, OUTPUT);    // Initialize the LED pin as an output

  rtc.halt(false);            // Set the clock to run-mode
  rtc.writeProtect(false);    // and disable the write protection

  Serial.begin(9600);

  // Use following lines once to set clock if battery fails (modify to suit)
  //rtc.setDOW(THURSDAY); // Set Day-of-Week to FRIDAY
  //rtc.setTime(15, 50, 0); // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(26, 4, 2018); // Set the date to August 6th, 2010

  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // Print current system date from RTC at start up
  Serial.print(“System date: “);
  Serial.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()));

  Serial.print(“Initializing SD card…”);

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println(“Card failed, or not present”);
    // don’t do anything more:
    while (1);
  }
  Serial.println(“card initialized.”);
}
// ————————————————————————————————————————————————
// loop()
// ————————————————————————————————————————————————
void loop() {
  String dataString = “”;                 // make a string for assembling the data to log
  int sensor = analogRead(A0);            // read analogue
  dataString += String(sensor);           // construct string with analogue signal
  buttonState = digitalRead(buttonPin);   // read button state

  // Logging enabled
  if (buttonState == HIGH) {
    File dataFile = SD.open(“datalog.txt”, FILE_WRITE);

    // if the file is available, write to it:
    if (dataFile) {
      // Write data to serial output
      Serial.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()) + “,” + dataString);
      // Write data to SD card
      dataFile.println(String(rtc.getDateStr()) + “,” + String(rtc.getTimeStr()) + “,” + dataString);
      dataFile.close();
      digitalWrite(ledPin, HIGH);
    }
    // if the file isn’t open, pop up an error:
    else {
      digitalWrite(ledPin, LOW);
      Serial.println(“error opening datalog.txt”);
    }
  }
  // Logging disabled
  else {
    digitalWrite(ledPin, LOW);
  }

  // Wait before repeating 🙂
  delay (200);
}