--=====================_120972198==_ Content-Type: text/plain; charset="us-ascii"; format=flowed At 03:47 PM 5/26/2005, Byron A Jeff wrote: > > > > My favorite answer is a 12F509 + 2 74HC595s (to drive > > up to 16 LEDs) but I suspect thats not what is being > > looked for. > >It begs an interesting question. Why is that combo better than >a 28 or 40 pin PIC? I love questions like this . Why indeed? My usual responses: 1) I can use a smaller packaged PIC (6 or 8 pins if the only thing is to read a few switches and drive LEDs). 2) I can place the LED drivers near the LEDs and connect with only 2 or 3 lines plus power and ground. Handy if the PIC is located elsewhere. 3) I can drive the LEDs from an un-regulated supply and keep the PIC supply nice and clean. (this is a trick answer: unreg supply is about anywhere from 3.3 to 6V if using 74hc595 or just about anything at all if using TPIC6595) 3b) Can drive reasonable sized relays instead of LEDs if using TPIC6595. 4) 74hc595 are just SOooo darned inexpensive! Drive 8 LEDs for 10 cents or so. 5) One of my boards has 40 status LEDs on it as well as 3- 7 segment displays. Also has 16 or so digital inputs (both binary and trinary). All driven with only 3 i/o lines from PIC. No question: if this is a one-off hobbyist project that needs only 12 LEDs, spend the extra dollars and go for a larger PIC. But **I** would probably do it with a tiny PIC and shift registers simply because that's what I'm used to doing for larger projects. And I just happen to have several hundred (or more) little (1" x 3") single-sided PCBs that hold an 8 pin PIC, simple 5V zener PSU (with JFET discharge circuit), 2- trimpots wired for RC time measurements, 3- digital inputs, 2- TPIC6595 shift registers. The PIC section can be snipped off, leaving the remainder of the board with the 2- shift registers to connected to previous boards to make a SR chain as long as needed. They get used for all kinds of simple projects. dwayne --=====================_120972198==_ Content-Type: image/gif; name="L342A2-01.GIF"; x-mac-type="47494666"; x-mac-creator="4A565752" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="L342A2-01.GIF" R0lGODlhHAOYAPcAAAAAAIAAAACAAICAAAAAgIAAgACAgICAgMDAwP8AAAD/AP//AAAA//8A/wD/ /////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMwAAZgAAmQAAzAAA/wAzAAAzMwAzZgAzmQAzzAAz/wBm AABmMwBmZgBmmQBmzABm/wCZAACZMwCZZgCZmQCZzACZ/wDMAADMMwDMZgDMmQDMzADM/wD/AAD/ MwD/ZgD/mQD/zAD//zMAADMAMzMAZjMAmTMAzDMA/zMzADMzMzMzZjMzmTMzzDMz/zNmADNmMzNm ZjNmmTNmzDNm/zOZADOZMzOZZjOZmTOZzDOZ/zPMADPMMzPMZjPMmTPMzDPM/zP/ADP/MzP/ZjP/ mTP/zDP//2YAAGYAM2YAZmYAmWYAzGYA/2YzAGYzM2YzZmYzmWYzzGYz/2ZmAGZmM2ZmZmZmmWZm zGZm/2aZAGaZM2aZZmaZmWaZzGaZ/2bMAGbMM2bMZmbMmWbMzGbM/2b/AGb/M2b/Zmb/mWb/zGb/ /5kAAJkAM5kAZpkAmZkAzJkA/5kzAJkzM5kzZpkzmZkzzJkz/5lmAJlmM5lmZplmmZlmzJlm/5mZ 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