So I buy 5 of these little things when I find out I am dealing with RS232 device instead of a TTL device. They arrive quick and I am delighted only to find I dont quite know how to wire them up. The project is to use an Arduino – which I love dearly – to drive an LED rolling display. I am not an electronics expert – so I struggled a little and popped 2 of them good and proper..
Never mind. I’ll buy this instead http://www.ebay.co.uk/itm/RS232-Serial-Port-to-TTL-Converter-Module-Board-MAX232-for-PIC-ATMEL-MCU-5V-/260995809488?pt=UK_Computing_Other_Computing_Networking&hash=item3cc49000d0
I am as always standing on the shoulders of giants – http://www.sundh.com/blog/2012/04/arduino-library-for-led-message-display/comment-page-1/#comment-93629
So my experience is:
From the RS232 Port – RX, TX and GND. Thats the -> -<and the – signs. Easy enough
On the TTL (Arduino) side – DO NOT USE 5V use 3.3V as this toasts the device and heats up and like tops itself. It certainly got very toasty when I put 5V across it. This could be because I messed up somewhere in the wiring but it certainly works well for me. I can also use the SoftwareSerial library as well so I don’t need to use TX/RX on the TTL Serial pins 0 and 1
So TTL is
-> – PIN X
<- PIN Y
For my device I used PIN 0 and PIN 1 – TX/RX – but I guess you can use other pins.
Hope this helps – it does work!