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About Keni

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  1. Sorry I must have mis-understood your post as I assumed from it that you were trying to drive an LCD display and LEDs directly over a 30 metre cable using the PIC logic level outputs. These are unsuitable for driving transmission lines so at the very least I would expect them to be connected to some form of line driver. I would be interested to see how you are driving the LCD and LEDs with DC. Perhaps I have the wrong end of the stick again. Now, thats what you call interference! Cheers davidb Hey David, I have a multi-core line (5V) to control a set of transistors, and
  2. Keni, 30m!!! I am surprised it worked at all. I wouldn't dare use standard logic levels over more than 300mm. If that is what you are doing I would consider a re-think before you run into other problems. Regards davidb Why's that? The multi-core lines aren't used to trigger the LED's directly, hence don't require as much current. All lines, including supply lines, are operating at DC, so there won't be the issue of long line capacitance or inductance interfering with the frequency response of my transmitted signal as it would if I were to send using AC. My control li
  3. Hey Guys, It appears my problem was caused by a long-length multi-core cable that I was using. There were a few lines which weren't connected, and were causing noise to be generated on the data lines. This was also manifested as a slight glow in some leds that I was controlling through a 30 metre line. Thanks for the help! Keni
  4. Hey Dave, I don't think that it is an external loading issue. My first version of the hardware did not have the LCD panel connected, and it worked fine controlling the shift register bank through RB1 to RB3 (I verified this again yesterday). I hooked up the output lines to some LEDs and the correct signals are being output. The two issues I can think of now are either the ports are jumping state very quickly for some unknown reason, or the voltage levels aren't high/low enough to be picked up as the correct state. Unless anyone has seen an issue like this before?? Thanks again Keni
  5. Hi All, I am interfacing a 16F88 with a HD44780 driven LCD panel. My arguments are set up as below, i.e. RA6, RA7 and RA0 are the control lines, and RB4, RB5, RB6, and RB7 are the data lines (using the upper nibble). Has anyone experienced any weird output on RB0, RB1, RB2 or RB3 with this configuration? I am controlling a bank of shift registers on RB1 to RB3, and I am seeing some unexpected signals on these output lines Otherwise could my logic levels be incorrect due to a missing capacitor or something?? Thanks everyone! #define LCD_ARGS 2, /* Interface type
  6. Hi, does anyone have any good examples of master and slave code for a 16F88? I have found a few implementations, but nothing that really works. I have read that SourceBoost provides libraries for the master control, has anyone used these? Thanks
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