Would like to use a 5v supply vfd display for one of my projects. Input for the display is RS232. I'm wondering if I can use a maxim232/233 to do the interface between display and mbed. Looking at the data input voltage requirements for these chips, I think that the voltage swing from a mbed digital out pin will work. Can anyone check me on this... Thanks

gary

The max232 works fine with mbed. I have used it in several applications. Provide 5V power to the max232. The max233 needs 3V3 power.

Did you use a pull up resistor on the TX pin of the mbed when driving the max232?

regards

Co Poppe

Pullup would not harm to raise the mbed logic high level a bit, but I didnt use it and it worked fine. I had some max232 in my component inventory so I used those, but if you need to get new components anyhow then I would use the max233.

thank you for fast reply. Same here but happen to have a ST232CN in the junk box. But that wo'nt make a difference.

kind regards

i want to connect mbed with a Vga cable. please help me to it for displaying color images on monitor.