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The Atmel AT89S52 is a microcontroller in the 80C51 family.
The AT89S52 microcontroller operates at a frequency of 12 MHz.
To limit the amount of current to the ports
AT89S52 is a microcontroller based on the Intel 8051 architecture and features. Concerning your question, AT89S52 is the heart of most project involving Dual Tone Multi Frequency (DTMF), that is to say it is the controller IC used in such project.
can we replace AT89c51 by AT89s52 but i have c51 code
It depends on the interfaces for the sensors. 1-wire would only need 1 wire, so if you have 10 i/o pins you could have 10 sensors. Its probably I2C, so for 6 sensors you'd need at least 12 I/O pins. Providing you have enough I/O pins on the Microcontroller you can use ANY Microcontroller available.
You actually have that reversed. A microcontroller is connected to a relay via a ULN2803 (or other power device driver IC) because the output pins of the microcontroller can't drive relays. The ULN2803 darlington transistors provide the power amplification and the inductive kickback protection needed to drive the relay while only lightly loading the microprocessor output pins.
The PIC16F88 microcontroller has a total of 13 I/O pins that can be configured as user input or output ports. These pins are grouped into Port A, Port B, and Port C, with Port A having 6 pins, Port B having 8 pins, and Port C having 4 pins. However, the exact number of usable I/O pins can depend on the specific configuration and function requirements of the application.
yes
semi conductor
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