Bo, I also have a raspberry pi project.. I got a hifi-berry card for it and it is streaming audio to a central audio system, I'm using VLC media player and an app on my cell phone to control it, I have not made use of the GPIO on them yet, but I would really like to learn how this can be accomplished with FPC, since I am more familiar with pascal than any other language, it would be great to learn how to do this! I have a particular application in mind. I have a relay board that will turn relays on and off with TTL level signals, what I wish to do is have a remote way to turn certain amplifiers on and off. There are 24 amplifiers going to 44 speakers (4 are subwoffers) in and around my house, sometimes I'll want just downstairs and outside amps on, other times I'll want just one room on, or all amps on.... etc. The amps are all in my crawlspace under the first floor, and that's where the raspberry pi is. I also have some volume control chips that are controlled by clocking data into them, I could chain them all together and be able to control all of them with just one clock and one data bit. Any advice on how to get started on controlling GPIO with a raspberry pi with FPC would be greatly appreciated!
-----Original Message----- From: fpc-pascal-boun...@lists.freepascal.org [mailto:fpc-pascal-boun...@lists.freepascal.org] On Behalf Of Bo Berglund Sent: Sunday, July 24, 2016 2:22 AM To: fpc-pascal@lists.freepascal.org Subject: Re: [fpc-pascal] Parallel Port Access with Free Pascal - windows On Fri, 22 Jul 2016 14:19:20 +0000, Mark Morgan Lloyd <markmll.fpc-pas...@telemetry.co.uk> wrote: >Or go the whole hog and >port the program onto a Raspberry Pi: Bo's doing something like you're >asking. Yes, indeed! I now have something like 7-8 operational RPi units for different purposes and in several places I have used the GPIO pins to control and read back digital stuff from FPC programs. Very convenient. Last I did was to attach a 4-way relay board to a RPi and put a smapp FPC command line program on it, which gets called from a PHP script on the Apache webserver on the Pi. Now I have a webpage, with which I can switch on/off the relays with in order to control the operational state of some measuring equipment sitting half way across the workd! You could do a LOT with FPC and a Raspberry Pi! Examples: The Pi also runs an OpenVPN server so I can access it with PuTTY and/or TightVNC to program it if I need to. My Pi also has a port mapping utility which makes it possible for me to remotely access a WiFi network device on a WiFi access point close to the RPi again from a long distance away. THis was created with FPC and Indy10 on the RPi. >Any of those have the advantage that the electronics can be positioned >to minimise the signal run carrying TTL. Long printer cables are >generally bad news. 15 cm wires to the relay board... -- Bo Berglund Developer in Sweden _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
