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Hi,
I am doing a Digital Timer using AT89C4051 and DS1307 RTC. Time is displayed on 16x2 LCD.
I have enabled 1 HZ square wave output and updating the time on LCD every rising edge.
The problem i am facing is the RTC time is not accurate. For every 24 hours i observed a delay of 2 minutes. I...
Hi Tahmid,
Thanks for sharing the circuit.
I have done in a different way.But my circuit needs auxiliary power supply. When i try to derive it from the battery, the circuit draws more current. that shouldn't happen in my case.
Your circuit seems to be working perfect. I tried in simulation...
Hi,
I need a circuit of LED indication.
My Voltage source(Battery) is 10 to 160Vdc. When ever the source is connected i need to show a LED for indication.
Can any body suggest me any idea.
Thanks and Regards,
Viswanath
Hi,
Now i have connected 20x4 LCD to ther Micro controller via PCF8574 I2C Expander.
I have used two PCF8574 chips to work with the LCD in 8 bit mode. This mode is working fine.
Now i have connected only one PCF8574 chip to connect the LCD in 4bit mode. But my LCD is blank.
I have attached...
Hi,
I want to interface PCF8574 I2C GPIO Expander with 89C52 micro controller.
My application is to interface 20x4 Character LCD and 4x4 Matrix Keypad with the 89C52 micro controller using I2C.
Before connecting LCD and KEYPAD, i am just trying to toggle LED.
I have connected the PCF8574 to...
Hi,
Currently i am doing a Battery Charger.
in this I want to have audio and visual indication when the battery is reversely connected.
battery reverse indication i have done using a resistor and LED like we do for negative supply indication.
but my question is about audio indication. Can i...
Hi,
I am viswanath from INDIA.
I am using liquid flux for soldering smd components and RANKEM make Iso prophyl alchol for cleaning the PCBs which consists SMD and leaded components.
after cleaning the pcbs, i observed the PCBs are sticky and some kind of white layer is formed around the...
HI,
Thanks for the link. I will definitely go through it.
DS1307 Seconds range is 00-59 BCD.
for example
When i update the seconds register with 16, it is updating as 10 and with 20 it is updating as 14.
So for updating seconds with 16 i need to send 232; and for 206 i need to send 32...
Hi friends,
I am doing a Digital Clock using RTC DS1307 and 89C4051 micro controller.
Time is displayed on LCD and different alarms can be set through 3 switches.
I have written the following code for updating RTC registers first time. Only minutes code is shown
//Minutes
min++...
Hi,
I am interfacing USB Flash drive to my micro controller using VINCULUM device via UART.
The Vinculum device sends the response in string format, but in micro controller i am receiving in hex format. i am storing all these hex values in an array.
for example if i send IDD command (IDD is...
Hi,
You may refer to the following websites
robokits.co.in
www.rhydolabz.com
www.embeddedmarket.com
https://www.sunrom.com
all are offering PIC development boards and lots more.
Hope this helps you.
Regards,
Viswanath
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