Charles Tritt / Mbed 2 deprecated analogRead

Simple analog read demonstration. Also streams value to serial port and lights LED. Does not use overloaded operators. The first of a collection of five basic demonstration projects.

Dependencies:   mbed

main.cpp@2:e0faf9e57796, 2017-03-27 (annotated)

Committer:
CSTritt
Date:
Mon Mar 27 14:20:32 2017 +0000
Revision:
2:e0faf9e57796
Parent:
1:8e3c0c69a6ca 
Added reading and using DigitalOut state.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 0:2254358fce87 1 /*
CSTritt 0:2254358fce87 2 Project: analogRead
CSTritt 0:2254358fce87 3 File: main.cpp
CSTritt 0:2254358fce87 4
CSTritt 0:2254358fce87 5 Reads from analog input, streams ASCII text to std serial using printf and
CSTritt 1:8e3c0c69a6ca 6 lights onboard LED. Also demonstrates use of floating point literal suffix
CSTritt 1:8e3c0c69a6ca 7 toeliminate warning and int constants for HIGH and LOW.
CSTritt 0:2254358fce87 8
CSTritt 0:2254358fce87 9 Written by: Dr. C. S. Tritt
CSTritt 2:e0faf9e57796 10 Created: 3/27/17 (v. 1.1)
CSTritt 0:2254358fce87 11
CSTritt 0:2254358fce87 12 */
CSTritt 0:2254358fce87 13 #include "mbed.h"
CSTritt 0:2254358fce87 14
CSTritt 0:2254358fce87 15 const int HIGH = 1; // Optional, but makes code more readable.
CSTritt 0:2254358fce87 16 const int LOW = 0; // Optional, but makes code more readable.
CSTritt 0:2254358fce87 17
CSTritt 0:2254358fce87 18 AnalogIn analog_value(A0);
CSTritt 0:2254358fce87 19
CSTritt 0:2254358fce87 20 DigitalOut led(LED1);
CSTritt 0:2254358fce87 21
CSTritt 0:2254358fce87 22 int main() {
CSTritt 0:2254358fce87 23 float value; // Value to be read and sent to serial port.
CSTritt 0:2254358fce87 24
CSTritt 0:2254358fce87 25 printf("\nAnalogIn example\n");
CSTritt 0:2254358fce87 26
CSTritt 0:2254358fce87 27 while(true) {
CSTritt 0:2254358fce87 28 value = analog_value.read(); // Read the analog input value (0 to 1)
CSTritt 0:2254358fce87 29 printf("Value = %f\n", value); // Send value as text via serial port.
CSTritt 0:2254358fce87 30 if (value > 0.5f) { // Activate built-in LED. The f is optional.
CSTritt 0:2254358fce87 31 led.write(HIGH);
CSTritt 0:2254358fce87 32 }
CSTritt 0:2254358fce87 33 else {
CSTritt 0:2254358fce87 34 led.write(LOW);
CSTritt 0:2254358fce87 35 }
CSTritt 2:e0faf9e57796 36 printf("LED = %d\n", (int) led.read()); // Send LED state via serial.
CSTritt 0:2254358fce87 37 wait(0.25); // 250 ms
CSTritt 0:2254358fce87 38 }
CSTritt 0:2254358fce87 39 }