/* * bright.c: * Vary the Q2W LED brightness with the analog card * * Copyright (c) 2012-2013 Gordon Henderson. *********************************************************************** * This file is part of wiringPi: * https://projects.drogon.net/raspberry-pi/wiringpi/ * * wiringPi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * wiringPi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with wiringPi. If not, see . *********************************************************************** */ #include #include #include #define LED 1 #define Q2W_ABASE 120 int main (void) { int value ; // Enable the on-goard GPIO wiringPiSetup () ; // Add in the pcf8591 on the q2w board pcf8591Setup (Q2W_ABASE, 0x48) ; printf ("Raspberry Pi - Quick2Wire Analog Test\n") ; // Setup the LED pinMode (LED, PWM_OUTPUT) ; pwmWrite (LED, 0) ; for (;;) { value = analogRead (Q2W_ABASE + 0) ; pwmWrite (LED, value * 4) ; delay (10) ; } return 0 ; }