Calculating day of the week
While adding software to perform an automatic adjustment of Daylight Savings Time to my clocks, I came across a problem. My GPS-powered gpSKY CLOCK does not contain a real-time clock. So? Well, the algorithm I used for determining whether or not a date is within Daylight Savings Time (from 2am on the 2nd Sunday in March to 2am on the 1st Sunday in November) relies on knowing the day of the week (0-Sunday, 1-Monday etc.) – data that is automatically…
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Large numbers on small displays…
Widely available and cheap, small 2 and 4-line LCD panels are convenient displays to add capability to Arduino projects that require the display of information or data. With the “LiquidCrystal.h” library built into the Arduino IDE, the availability of both parallel and I2C interfaces, and a wide variety of bright and subtle backlight colours, they are simple to add to your Arduino projects and look great. However, the popular 2 (line) x16 (column) and 4×20 LCDs appear to use the…
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MTK3339 chipset GPS module
I have recently been intrigued by some really innovative geo-caching and GPS-enabled Arduino projects, and it got the creative juices flowing. I read up on various GPS modules on the market and settled on a GPS module called the "Ultimate GPS Breakout v.3′′ that sported the highest receiver sensitivity (-165 dBm), and the fastest read data rate (10 Hz), all packaged in an Arduino-friendly (5V interface) module. Adafruit has a GPS library for this chipset and a whole suite of…
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