Matrix user forums

another problem we have now on top of the noise is a delay on the TCP stack.

our protocol is as follows:

RX 1 byte
TX 4 bytes

RX 1 byte
TX 4 bytes

RX 1 byte
TX 4 bytes

RX 1 byte
TX 4 bytes

and when done from an application on another pc, there is no noticeable delay. the whole cycle above ...

yes, the heartbeat is recognizable but the waveform is to noisy, even on the oscilloscope.
so taking a sample and half a ms later another one can give a huge difference, even if it should be the same value if the noise wasn't there.

it looks a bit like this except that the R waves don't stand out ...

Thank you Ben,
now we have another problem in our project.
We are trying to get a proper signal out of the EKG from Matrix Multimedia, but we get too much noise.
Is it normal, that it is the same signal with and without groound is connected ?
How can we fix that problem ?

best regards
Kai

Hello
We have a problem with your project.
We are trying to connect both RFID and TCP/ IP blocks to your Microcontroller Port C.

The blocks use these ports:
The TCP/IP E-block uses pins 0-INT, 4-SDA, 3-SCL
The RFID E-block uses pins 0-CTS, 6-TX, 7-RX

We tried to change the chip select pin to 1 ...