App note from FTDI/Bridgetek on simple implementation of external power switch for RTC power hand-over. Link here (PDF) The Texas Instruments SN74AUC2G53 Single-Pole Double-Throw (SPDT) analog switch is used to select the power supplied by the 1.5V battery or by the 1.2V internal LDO.
Tag Archives: rtc
RTC based automatic LED lamp
Dilshan Jayakody published a new build: This is real-time clock based automatic LED lamp which we originally designed to use as night light. This lamp can programmed to turn on and off at the specific time of the day. For example, it can program to turn on at 6 PM on each day and to […]
Tiva and Stellaris Launchpad RTC usage in Energia
Vadim has posted a tutorial on how to use internal RTC of Stellaris and Tiva Launchpad boards in Energia IDE: For those of you who still have one of those old Stellaris Launchpads, I’m going to show how to utilize one of its most useful features – real time clock – in a simple way. Actually, the […]
DS3231 RTC control and theory with the Bus Pirate
@omwah tweeted, “Article I wrote on controlling the Maxim DS3231 RTC with the Bus Pirate” The Maxim DS3231 is an accurate, yet relatively expensive real time clock (RTC). It has an integrated temperature compensated crystal and communicates over I2C. Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.
DIY Binary clock in an old hard drive shell
x2Jiggy wrote a post on his blog detailing the build of his DIY binary clock: This clock uses a minimalist design constructed in the shell of an old hard drive. A DS1307 Real Time Clock (RTC) module keeps accurate time while an ATMega328 (with Arduino bootloader) microcontroller determines which LEDs should be lit to display the current […]
App note: Tips for writing bulletproof real-time clock control code
Here’s a good app note from Maxim on writing real-time clock code to get a stable system operation. With the use of proper device initialization and code sequencing, accurate timekeeping and clock alarm operations become a more manageable task.
Turning your Flash Destroyer into a clock
voidptr writes: So ! …. 2 years later, here an update on living with my dangerous Flash Destroyer hack ! First off, front and back picture :o) I added few things since its birth … A battery for the real time clock, really handy when you reprogram code and you don’t want to lose the […]
3V-5V switchable I2C Real Time Clock Shield
Dave writes: Using the Maxim/Dallas 1307 RTC that runs at 5V with the Arduino Due that runs at 3V. FETs are used for bidirectional level shifter per a Philips app note. All built on a Freetronics ProtoShield of course! Via the forum.
RTC and port expander for an Arduino nixie clock
Luca is designing a nixie clock that will be run from an Arduino. In the latest development he shows to to implement a real time clock source and a port expander to drive the nixies. In this third blog post, I’m going to show you the logical view of my Nixie clock and two of […]
DIY Chronodot, homemade RTC with a battery backup
Valentin built a DIY version of the Chronodot real-time clock with battery backup. He used some disc shaped perfboard to assemble all the components. There is an optional component that you can add – a real time clock (RTC) with battery back up. It is called Chronodot RTC. All it does is ensure that clock […]
Turning your Flash Destroyer into a clock
Ok, so you burned all the memory chips you had around, and now a nice 7-digit display is standing on your desktop just taking up space. This hack turns your unused Flash Destroyer into a clock using a real time clock IC and some spare logic. Via the forum.
Chronoduino board v0.3
The Chronoduino uses an Atmega168PA microprocessor. On the peripheral side there is a DS1337 RTC, a BMP085 barometric/temperature sensor, and a MCP73831 Li-Po battery charging IC. Numerous headers as well as two buttons, LED, and a buzzer are on the board. The idea behind the project is to design an Arduino watch platform (hence, quite unimaginatively – Chronoduino) that’s also […]
DIY GLCD clock project
ezflyr posted his GLCD clock PIC project: The project is based around the 75×52.7mm 128×64 Graphic LCD. The time keeping is delegated to a battery-backed Dallas DS-3231 RTC. A PIC 16F876A is used to tie it all together. The PCB was designed to fit nicely behind the display. It is operated via two push buttons, which allow […]
7400 competition entry: RTC with gate IC
DolceVii posted his old clock made with only gate ICs for the 7400 competition. Via the contact form.
Adafruit DS1307 real time clock breakout board kit
Adafruit has a new DS1307 real time clock kit. We’ve demonstrated the DS1307 with the Bus Pirate, which you can also pick up at Adafruit.