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Hi: I would like to add an FM radio as an alternate to the piezo alarm on a clock that I just finished building using a 28x. All suggestions welcome. Thanks Tim

Good Afternoon: I would appreciate some troubleshooting suggestions. I am having a challenge with getting a MAX7219 to run 4 CC 7 segment display digits. I have all of the segments joined on a bus and with the cathodes grounded, +5 to any segment on the bus lights up the segment on all 4...

The code below is for a "simple" clock that I wish to use a keypad to provide settings for. Some of it seems to work great on it's own (displaying the digits if manually set) and fetching the hex values from the keypad, but I seem to have no consistent results when I try to put it...

Can someone recommend the best way to lose about 1/2 a volt or so? I am trying to use a 74LS32 quad OR gate to combine 4 imputs to 1. The logic is straight forward, but I am presenting 1.08 volts to the inputs of the 74LS32 before I push a button to make the input high. The 74LS32 will read...

I have basically lifted the code below from http://www.rev-ed.co.uk/docs/chi008.pdf and I am trying to scan a 4x4 keypad. In the "scan" section, only the last key_value routine seems to work. For example, as is, only the key_value = 12 routine works. If I comment out the key_value =...

Hi Folks. I got my new 28x and I tried to connect with just the 10k / 22k minimum circuit. I'm stuck way back at the beginning. I have read the new user checklists and I did read the comment that says the circuit diagram on Pag 21 of the getting started manual is correct. Please tell me what...

In my excitement to get started with my new Pic 28X I accidently hooked my power suuply line on the unregulated 12v side of my power supply instead of on the 5v side. I have not been able to communicate with the 28x and I figure I probably burned it out with the 12v. It was connected to 12v...