Choosing of MCU

[chenjk09]

Hi,

How to choose the correct MCU?

My ECG signal, bandwidth is 0.05Hz to 100Hz

Base on nyquist theorem,
Sample rate > 2 * highest frequency of the signal
Sample rate = 100Hz * 2 = 200Hz

I choose PIC16F887 because it has

A/D Converter:
- 10-bit resolution and 11/14 channels

Base on my understanding 2^10 = 1024
And it also have Program memory, Data SRAM , Data EEPROM
Is my understanding of this particular MCU right?

How you choose the correct MCU and specification to take note?

Is PIC16F887 matched?

Attached file is the Data sheet of PIC16F887

Hope you guys can advice me
Thanks

 

[Nigel Goodwin]

That should be a fine choice - assuming you want a PIC with that many pins?.

 

[chenjk09]

Do you guys have any recommendation?
If choosing of MCU what to take note?

 

[Nigel Goodwin]

Do you guys have any recommendation?
If choosing of MCU what to take note?

One you can write code for?

Number of pins you require, speed you require, what facilities you need.

Really you need to work out what your project needs, and choose one to suit.

Often, for hobby use, you tend to use too large a device - such as a 40 pin one with most of the pins not used.

 

[chenjk09]

10-bit resolution and 11/14 channels
2^10 = 1024
1024 mean the step of the output?

 

[Nigel Goodwin]

10-bit resolution and 11/14 channels
2^10 = 1024
1024 mean the step of the output?

Yes, it means the analogue input can read from 0 to 1023.