communication between 2 PIC

[ruud67]

After a lot of study, I made my first flowcode V4 program for letting burn 15 different LEDS, depending on 5 switches.
Up, down, left, right and reset.
These LEDS need to be in 2 places.
1 place is the control box with some switches (and the 15 LEDS), the other place is on a flexible arm (again 15 LEDS).
Because of that flexible arm I want to use only 4 wires between the control box and the second screen, so I was thinking about I2C or RS232.
But I can’t find the right way to get started with this.
It only needs to write 15 bits from one side to the other and there is no need for feed back, can somebody help me with this (im very new in this )

Thank you
Ruud

[Benj]

Hello Ruud

I have moved your post into the v4 topic. Please can you post Flowcode questions here.

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Are you controlling each LED from a different I/O pin. If so then it will make things easier for you. Are you also using a second micro on the end of your flexible cable or do you just want to connect up more LEDs to this?

If your using a second micro then RS232 is probably your best option. You should be able to manipulate two variables to control the two 8-bit ports connected to the LEDs. Then simply send these same control bytes over the RS232. The receiver program should then check for incoming bytes and if it received data then update it own ports for its LEDs.

If you only wish to use one micro then you could use something like the MCP23S17 or the MCP23017 which is an output expender chip controlled by SPI or I2C.