/* * volts.c: * Read in all 4 analogs on the Q2W analog board. * * 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, pin ; // Enable the on-goard GPIO wiringPiSetup () ; pinMode (LED, OUTPUT) ; // On-board LED // Add in the pcf8591 on the q2w board pcf8591Setup (Q2W_ABASE, 0x48) ; printf ("Raspberry Pi - Quick2Wire Voltmeter\n") ; for (;;) { for (pin = 0 ; pin < 4 ; ++pin) { value = analogRead (Q2W_ABASE + pin) ; printf (" %5.2f", (double)value * 3.3 / 255.0) ; } printf ("\r") ; fflush (stdout) ; delay (100) ; digitalWrite (LED, !digitalRead (LED)) ; // Flicker the LED } return 0 ; }