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DS3232 Clock Frequency Calibration

DS3232 is an extremely accurate RTC with a guaranteed accuracy of 2.5 ppm (0 °C to 40 °C), which translates into an error of just 80 seconds over the course of a year under the worst case scenario. I had done a few projects using this chip before (you can read about them here).

Interfacing DS3232 RTC With MSP430G2452

I have used DS3232 RTC (real-time clock) in many Arduino based projects before. DS3232 utilizes a temperature compensated oscillator, which makes it far more accurate than devices like DS1307. In this blog post, I will give some code examples on implementing a digital clock using DS3232 and the TI MSP430 Launchpad.

I2C Data Logger Using ATmega328p and DS3232 – II

In my last blog post, I showed you the schematic of a I2C data logger I built. Here I will discuss some sample code used for this data logger and how to make it even more flexible.

I2C Data Logger Using ATmega328p and DS3232 – I

There is a popular data logger shield out there designed for Arduino using a DS1307 real time clock chip. And that design makes data logging extremely easy if an Arduino board is used.

Keithley 706 RTC Upgrade – How to Make Any Clock More Accurate

The builtin real-time clock (RTC) in my Keithley 706 works rather nicely as a clock in my lab when the scanner is not in use. The 7-segment displays are big and clear and they are two dedicated displays for the seconds which comes in quite handy. However the main drawback of this auxiliary clock functionality […]

VFD Clock – Putting Everything Together

After I completed the filament driver and the circuit to drive the multiplexed VFD segments, it is time to finish the VFD clock project I had in mind earlier.

TI MSP430G2 SPI Examples

In my earlier posts (1, 2, 3), I showed some examples of using the I2C protocol with TI’s MSP430 Launchpad. Many MCUs in the MSP430G2 family also support the SPI bus. In today’s discussion, I will give a couple of examples on communicating with an SPI port expander (MCP23S17).

MSP-EXP430G2 I2C Master Examples

Last week, I mentioned that in order for the I2C bus to function correctly when using the MSP430 Launchpad you might need to remove the jumper on P1.6. This is because P1.6 is the SCL pin and the connected LED may cause the output voltage to stray from the desired logic voltage levels. In this […]

Temperature/Humidity Data Logger — One Year Worth of Data

I had almost forgotten about the experiment I started late last year using the data logger I built to log the temperature and humidity values in my basement lab for an entire year. The logger worked well during the initial trial run, but having it run continuously for a whole year is another story.

Temperature/Humidity Data Logger — Trial Run

I built a rather generic I2C data logger a few weeks back. As I mentioned in my earlier posts, it can be used to log data from almost any I2C slave devices with relatively little code modification.