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Thanks for creating this instructable Kepp27 - worked like a charm. Thanks to CésarA94 for the windows VS.@hi631 - I tried your colour version, but the code you posted does not compile - variable KD, which looks like it is part of the receive ISR is not defined, plus there are some brackets missing in the area of if(UCSR0A & (1<=0x20). I've bodged a way around it and it kind-of works. Thanks for sharing.