Run this:
    puts "Type any characters, then <Return>."

    expect {
        ? {
            set result $expect_out(0,string)
            if [string compare \n $result] {
                scan $result %c value
                puts "You just typed '$result' (decimal ASCII $value)."
            }
            exp_continue
        }
    }



Example output:  type "a<CR>", see decimal 97; type
"<F1><CR>", see the sequence





27-91-49-(49,50)-126
[[explain]]
Win 95










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Also see "[keysyms]", CWIND [[?]], and "[How to send escape characters through Expect]".