connecting two arduino boards + getting stable readings

Using Arduino Interfacing w/ Software on the Computer
#1

Hey Everybody

Im currently doing a project with 12 photocells, which will send analog input to MaxMsp. Im using two arduinos- and it is possible to read from both boards at the same time, BUT.. My problem is that the connection seems to be very unstable when I read from both at the same time. I need som help to figure out how I can get stable readings from two arduinos

Im using two arduino Uno and Mac

Mvh. Bjørn Dam Larsen

#2

What exactly do you mean by "read from both boards at the same time" ?

How is everything connected?

...R

#3

I have two arduino uno boards- each have 6 photocells connected via analog input. Both boards are connected with USB.

I am using MaxMsp to read the values. On each board I uploaded the arduino script for ARDUINO2MAX. I alos made sure each board is connedted to a specific serial port.

I can get values from both boards into MaxMsp, thats not a problem. The ISSUE is that the values gets unstable when I use two arduino boards at the same time. It works fine if I only use one board at the time.

Arduino2Max_Nov2012_V_6.ino (1.37 KB)

#4

bjoerndamalrsen:
The ISSUE is that the values gets unstable when I use two arduino boards at the same time. It works fine if I only use one board at the time.

Is it possible the PC program is closing a serial port when it switches to read the other port?
It should keep both ports open all the time.

...R

#5

Sounds like a solution, how can I make sure both are open at the same time?

#6

bjoerndamalrsen:
Sounds like a solution, how can I make sure both are open at the same time?

Just don't close them.

I know how not to close ports in Python.
I don't know anything about MaxMsp.

...R

#7