Listing Program At89s51 Projects
27.09.2019by admin
Complete guide about DS1307 RTC interfacing with 8051 microcontroller, rtc configuration, data framing, registers and rtc programming by using I2C protocol.
Hi everyone, I'm doing a project on Atmel microcontroller. The aim of the project is to sense the ambient temperature using lm35, digitize the data using adc0804 and then display the temperature on an LCD. When the temperature exceeds a certain threshold display the message and simultaneously activate a buzzer. Components used are: lm35 (temperature sensor) adc0804 at89c51 (microcontroller) lcd Source code in 'C' If you have any information or data or useful links regarding this project please reply. Thanks in advance.:).
I'm new in this web. But i'm not new in programer.I see your project is cool. You said,you used 89C51,LCD,ADC0804 and LM35.
I work in automatic field,i see many manufactors use PTC resistor as a temperature sensor, so why don't you use it?u have to create a constant current so when the temperature raise, the resistor raise so the voltage drop in this resistor raise. The voltage then will be sent to 89C51 as a input signal. It look like very easy,right?It's my opinion.
But you can send me your project, i will see it and feed back to you as soon as possible combination makes you live, division makes you die. You have clicked on the '?' Button for search help. To search the site, enter your search terms in the box labeled 'search the site' and hit Enter. Some tips for better search results. Precede each search term with a '+', as follows:. +Modbus +TCP Otherwise, any post with either term will match.
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RTC Interfacing with 8051 Microcontroller RTC Programming and Interfacing RTC interfacing with 8051 microcontroller is similar to all other kinds of “Real Time Clocks” interfaced to it. So let us look on simple RTC interfacing with and programming procedure involving in it. Step1: Select RTC Device The various kinds of RTC chips are available in the real time embedded world, which are classified based on various criteria such as package type, supply voltage and pin configuration etc. A few types of RTC devices are;.
Two-Wire Serial Interface (I2C Bus). Three-Wire Serial Interface (USB BUS).
Four-wire Serial interface (SPI BUS) First, we need to select type of RTC device by category based on requirement like I2C Bus RTC or SPI Bus RTC or other, which suitsfor interfacingwith respective microcontroller. Then we can select features of RTC device depending on requirement of application such as battery life, suitable package and clock frequency. Let us consider two-wire interfacing.
Step2: Internal Register and Address of the RTC Device RTC stands for real time clock which provides years, months, weeks, days, hours, minutes and seconds based on crystal frequency. RTC consists of inbuilt. A battery backup will be provided in case of failure of main power supply by connecting a battery to RTC device.
RTC DB1307 Configuration: RTC Internal Blocks and Pin Diagram A0, A1, A2: are address pins of RTC DB1307 chip, which can be used to communicate with the master device. We can control eight devices with RTC interfacing with by A0, A1, A2 bits using I2C protocol. VCC and GND: VCC and GND are power supply and ground pins respectively. This device operated with 1.8V to 5.5V range. VBT: VBT is a battery power supply pin.
Battery power source must be held between 2V to 3.5V. SCL: SCL is a serial clock pin and it is used to synchronize data on serial interface. SDL: It is a serial input and output pin. It is used to transmit and receive the data on serial interface. Clock Out: It is an optional square wave output pin. OSC0 and OSC1: These are crystal oscillator pins which are used to provide the clock signals to the RTC device. The standard quartz crystal frequency is 22.768KHzs.
Device Addressing: I2C bus protocol allows many slave devices at a time. Every slave device must consist of own address to represent on it. The master device communicates with particular slave device by an address. RTC device address is “0xA2” wherein “1010” is given by manufacturer and A0, A1, A2 are user define address, which is used to communicate eight RTC devices on the. Device Addresing R/W bit is used to perform read and write operations in RTC. If R/W=0, write operation is performed and R/W=1 for read operation.
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Address of Read operation of RTC= “0xA3” Address of Write operation of RTC= “0xA2” Memory Registers and Address: RTC registers are located in address locations from 00h to 0Fh and RAM memory registers are located in address locations from 08h to3Fh as shown in figure. RTC registers are used to provide calendar functionality and drive time of day and to display the weekends. Memory Registers and Address Control/Status Registers: DB1307 consists of two additional registers such as control/status1 and control/status2 which are used to control real time clock and.