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This is my Nixie Tube Clock. First I want to use USB to get power and communication. I used STM32F072 48pin series. It has internal rtc and yes, crystalless USB! I wrote PID algoritm for 5V to 170V converter and bingo, i did it with classical boost converter and around %98 duyt cycle! For more information please read my entry about that, unfo
PIC32 and most other microprocessor don't have a separate rtc power supply, so the battery consumption will be much higher than with a dedicated rtc. The internal rtc isn't suitable for longer backup periods with a small battery.
we are using the internal rtc of LPC1768 micro controller. we have made the PCB design and the PCBs are working good. we are using it for some alarm systems. out of 100 the 10% of PCBs are not functioning with rtc. we are using the good quality crystals (32KHz with 1% tolerence ) and we found the crystals are good. Apart from (...)
Hi all, I am working on a project that using SIM908,module on the board. I have a doubt that how could I set /read the internal real time clock of the module? I have searched for a AT command but nothing was referred on the data sheet..
Reference previous thread: I had a similar problem with a PIC18F46J11 which lost several seconds every minute. The crystal WAS running at 32768Hz exactly as intended. I don't know if the same applies to your PIC24 device because you haven't told us which one it is, check you a
Hi, I wanna add battery for internal rtc and when power get off, device will run until battery charge off. So I have to add chargable lion battery in schematic. Anyone can help to adding battery and charging part. I use pic18f66j65 microcontroller. Thanks you
This is a design i have composed for tracking the acceleration and direction of travel of a moving car. I was hoping to get some input for improvements or possible faults. 116448 A 3.7V 18350 or 18650 provides the power to the lm2623 switching boost regulator to provide 5V for the micro the gps and the accelerometer.
Hai every one, I am using the internal rtc for my project to read the date and time, but some one said that external rtc has more advantages compared with the internal rtc why? what is the reason for that? please explain me what are the main difference between internal (...)
i want drive a ds1307 with ATmega32 in assembly (ATmega32 works in 8 MHZ internal oscillator mode) i use this simple program for drive ds1307 and its not working ... leds randomly turn on and off the purpose of this program is first send primary Values to ds1307 (second/minute/hour/day/month/year) and then reading second and send it to
Guys, Does anyone know on how to initialize rtc on STM32 and display the content of the register to LCD ? Any links or reference will be appreciated, Thank you
I have a problem with an internal rtc in LPC2138 b/c battery backup does not work, when I unplug power supply and then plug it I get a random time it seems that battery backup does not work correctly but why? Here is a schematic of connection page 1: and this code I'm using to configure rtc: CCR = (
Guys, I want to set starting time and stopping time with rtc, Shall I use eeprom for it ? How to compare between internal eeprom and rtc ? any clues or ideas ? thanks
Reading and writing the time and date registers is an asynchronous event, separate from the automatic update of the internal registers. Two types of read errors can occur when the time and date registers increment while being read. First, the data could change while a single register is being read, or, second, the data could change during the time
It is better to use rtc DS1307. If you generate time using code and without rtc then when there is a power failure your time will be 00:00:00 and you can't write time to eeprom every few minutes.
You can do this with the internal oscillator since the timing isn't crucial. A few minutes (I'm sure hours as well) here and there won't be a problem. So, there's no need to add an additional rtc chip. Any PIC with a timer should be usable. How many pins do you need in total? Take a look at PIC12F629, PIC16F630 and PIC16F628A. Hope this helps. Ta
I'm rather surprised you were unable to achieve a reasonable level of accuracy with the DS1307. However, the MAXIM DS3224 offers an integrated temperature-compensated crystal oscillator (TCXO) and crystal with an SPI interface. Extremely Accurate SPI Bus rtc with Integrated Crysta
Hi All, Sir, Im Using MSP430 as micro controller in my design, The issue is rtc clock (32Khz) drift, which leads to show rtc (Configured in calender mode) to show Excess 22 Sec in Each 1 Hour, that is almost 5000 ppm error, if i configure the board to source from internal crystal also, same issue persists, I changed load capacitor (...)
Hi, Can'I use my Atmega88 with internal RC oscillator and in the same time connect an 32.768Khz crystal on pin TOSC1 / TOSC2 for rtc, and is this methode accurate ?. Thank's
Hi, Depending on the complexity of the rest of your program you can also use a couple of internal methods. Timer1 can be used as a timebase to an internal interrupt driven rtc. Just add a 32khz crystal and caps to the Timer1 pins, example Assembler code and circuitry in the 18F datasheets, Timer1 section. Timer0 can also be (...)
Hi, Can I use rtc (I mean by connectiong an 32768 HZ crystal on Tosc1 and Tosc2), and the the main clock source is the internal 8 Mhz.? All This on an Atmega 8.