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Ok I need a bit of help understanding this. When you define ports and stuff you will say; PORTB=0xFF and then you see arrays set up using: 0b00101100 is the 0b different because it uses bits instead of letters? thanks

language? chipset? Liam Beale (moderator) http://acronum.com/
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Liam Beale (moderator) http://www.facebook.com/groups/364570536961945/

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Sorry, in C. Here is the sample i found: #include #include //declare global arrays for two patterns ; //PB as output PORTB= 0x00; //keep all LEDs off

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The language is obviously C for either AVR or PIC PORTD = 0xd7; is hexdecimal code PORTD = 0b11010111; is the exact same number (215), but in hexdecimal form instead. The two are generally interchangeable in code, but it generally pays to use one convention ----------------- If at first you don't succeed, you must be using Windows.
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I stick to the hex. For setting up many ports, I prefer to use binary. Binary is easier to read. Dan Collins Moderator
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BTW easy way to convert between the two if you understand them. Each hex placeholder will count to 15 decimal (0-9-F) which is equal to a nibble (four bits). To convert binary to hex, break the binary into four block chunks and find what each represents. For example, 916... 1110010100 (Binary) 0011 1001 0100 (Split Binary) 3 9 4 (Decimal Equivalent, and Hex in this case) Of course, if you have a decimal equivalent in the range 10 to 15 then you assign an approprite character, A to F. 255, or 1111 1111, is FF (written as 0xFF under most circumstances) in hex. 256 is 100 in hex. Conversely, you can take each hex character and convert it back to binary. Tom
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2b or not 2b = $FF Liam Beale (moderator) http://acronum.com/
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0x2B | ~(0x2B) == 0xFF; Dan Collins Moderator
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Dan 'The Man' Collins Moderator http://dancollins.github.com/

Not sure if this has been covered above, but to clarify: Let's pick a number - in this case 255, the largest number you can store in a char variable (unsigned) or a single byte. - 0xFF in hex - 0b11111111 in decimal Note, you can also represent 16-bit (2-byte values also in this format): ie. 65535 = 2^16 - 0xFFFF - 0b1111111111111111 Often in website development, you may see HTML color tags which look something like this: #FFFFFF -- In this case, this is our Red, Green, Blue (RGB) components in 8-bit resolution (ie. max range 0-255) Matt (Mentor)
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Matthew Richardson (Elec.& Software Engineer/Mentor, Brightsparks NZ)

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binary is handy if you forget the decimal value for some things, eg on my eight digit 7 segment display each segment can be turned on or off via binary codes each digit taking an 8 bit byte to control each binary digit is worth 2^x eg 8 bits 2^8 = 256 or 128 64 32 16 8 4 2 1 in each space from 0 - 11111111 a picaxe can use a byte variable to control output pins using a let pins command with a byte variable eg on an 08 or 08M you can count to 0 to 15 in binary in other words 0x... would be hex 0b... would be binary http://resistorhelper.no-ip.org
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