Search found 93 matches

by ljbeng
Tue Jan 14, 2003 11:34 am
Forum: General Discussion
Topic: LED 5x7 matrix driver needed
Replies: 3
Views: 843

Re: LED 5x7 matrix driver needed

Did you get any help on this problem? Let me know I may be able to help. Get back to me via my contact form at www.ljbeng.com. Thanks.
by ljbeng
Mon Jan 13, 2003 2:42 pm
Forum: General Discussion
Topic: pic serial data
Replies: 4
Views: 1217

Re: pic serial data

The pic could convert to DTMF audio out and on the other end the CD22204 DTMF decoder could be used and also be connected to the other PIC. Serial rate may have to slow down considerably but I have used DTMF to send serial data over the phone, very slow but it worked. About 100 Baud was all I needed...
by ljbeng
Mon Jan 13, 2003 11:09 am
Forum: General Discussion
Topic: PIC High Volt Meter
Replies: 1
Views: 596

PIC High Volt Meter

I want to make a High voltage meter (10,000 volts) interfaced to a PIC microprocessor PIC16F877. I have seen simple HV probe designs with 10+ 10MEG Ohm resistors in series but they are made to plug into a voltmeter set to the 100 volt scale (also 10MEG input impedence). I assume I will need an op-am...