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Help choosing the right PIC

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internetuser2k12

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Hello!

I have to use RTC DS1307, SD card, and USB HID Communication with PIC. I want to know which is the best PIC/PIC18F for the project. DS1307 and SD Card both uses SPI. So I need two SPI interface to PIC.

I have to read the adc value that is temperature from LM35DZ and log the value with date and time from RTC to SD card.

Should I use MCP23S17?
 
Last edited:

Without the estimated code size and the speed you require it is difficult to help you.

Any way you can start with pic18f2550
 
internetuser2k12 said:
I have to use RTC DS1307, SD card, and USB HID Communication with PIC. I want to know which is the best PIC/PIC18F for the project. DS1307 and SD Card both uses SPI. So I need two SPI interface to PIC.
Click to expand...

You can certainly attach multiple SPI slave devices to the same interface, each device does require a separate CS/SS line by which the SPI master (PIC) selects the currently active SPI slave device.

Therefore, SPI master (PIC) does not normally require multiple SPI interfaces.


BigDog
 

You can certainly make do without a port expander.

EDIT: DS1307 uses I2C and not SPI.

You can use 18F2550 if pin count is sufficient. If you require more pins/IO lines, you can use 18F4550.

To select the required PIC, use the Microchip Product Selector: **broken link removed**

Hope this helps.
Tahmid.
 
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But the RTC DS1307 part in proteus doesn't have a CS/SS pin. How can I use it as a slave with SD Card reader?

- - - Updated - - -

@Tahmid

Can you post a Proteus schematic of PIC18F4550 with RTC DS1307 and SD Card reader?

Thanks
Jayanth D
 

For data transfer with the DS1307, first the slave address must be sent. So, if you do not send the address of DS1307, you won't be transferring data with it. So, at that time, communicate with the SD card.
 

DS1307 uses I2C which is different from SPI.

DS1307 can be connected through any normal IO pin by bit bang..

So there is no interference.
 

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