The DS3231M is a low-cost, extremely accurate I2C real-time clock (RTC) with temperature compensation. It incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted.
The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred through an I2C bus.
I added and RTC module to the Mossel Bay Mesh Server. We now have a time stamp on Mumble as well as the Mossel Bay Mesh Weather Camera and any other device that uses a time reference.
Here is a few images of the project.
Please note a BNC connector is not to be recommended for use on 5.8 Ghz operations, but at the time this is what I had in my junkbox. The last photo show the antenna installed. In my opinion this antenna works just as well as the grid antenna in the direction of the QTH of Johan ZS2I. I will test it later in a shootout over longer distances. Price-wise the Grid would set you back well over a R1000.00 while the 10 Turn Helical cost me nothing as I had all the parts in the junkbox. If I had to put a price on the antenna it might cost you less than R100.00 Final note: We are working with the Ghz spectrum and all measurements must be very accurate. One millimeter to long or short will effect the antenna’s performance greatly. Connectors and co-ax cable must be of the highest standard and suitable for the Ghz frequencies. No margin for error and sloppy work here!