main.cpp

00001 /* mbed Example Program
00002  * Copyright (c) 2006-2014 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016  
00017 #include "mbed.h"
00018 
00019 // Initialize a pins to perform analog input and digital output fucntions
00020 AnalogIn   ain(A0);
00021 DigitalOut dout(LED1);
00022 
00023 int main(void)
00024 {
00025     while (1) {
00026         // test the voltage on the initialized analog pin
00027         //  and if greater than 0.3 * VCC set the digital pin
00028         //  to a logic 1 otherwise a logic 0
00029         if(ain > 0.3f) {
00030             dout = 1;
00031         } else {
00032             dout = 0;
00033         }
00034         
00035         // print the percentage and 16 bit normalized values
00036         printf("percentage: %3.3f%%\n", ain.read()*100.0f);
00037         printf("normalized: 0x%04X \n", ain.read_u16());
00038         wait(0.2f);
00039     }
00040 }