First Last / Mbed 2 deprecated BMT-K9_wait_potmeter_store_value

blink LED; blink ratio on / off depends on potmeter value

Dependencies:   mbed

main.cpp@0:34a08ea1e3fc, 2013-09-24 (annotated)

Committer:
vsluiter
Date:
Tue Sep 24 15:05:54 2013 +0000
Revision:
0:34a08ea1e3fc
Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vsluiter 0:34a08ea1e3fc 1 #include "mbed.h"
vsluiter 0:34a08ea1e3fc 2
vsluiter 0:34a08ea1e3fc 3 // myled is an object of class DigitalOut. It uses the LED_RED pin
vsluiter 0:34a08ea1e3fc 4 // in human speech: myled is an output that can be set to zero or one. LED_RED is the pin which is connected to the output
vsluiter 0:34a08ea1e3fc 5 DigitalOut myled(LED_RED);
vsluiter 0:34a08ea1e3fc 6
vsluiter 0:34a08ea1e3fc 7 // pot is an object of class AnalogIn. It uses the PTB0 pin
vsluiter 0:34a08ea1e3fc 8 // in human speech: pot is an analog input. You can read the voltage on pin PTB0
vsluiter 0:34a08ea1e3fc 9 AnalogIn pot(PTB0);
vsluiter 0:34a08ea1e3fc 10
vsluiter 0:34a08ea1e3fc 11 int main() {
vsluiter 0:34a08ea1e3fc 12 //declare a variable to store the potmeter value in. myled.read() returns a float.
vsluiter 0:34a08ea1e3fc 13 float tijd;
vsluiter 0:34a08ea1e3fc 14 //while 1 is unequal to zero. For humans: loop forever
vsluiter 0:34a08ea1e3fc 15 while(1) {
vsluiter 0:34a08ea1e3fc 16 //read value of potmeter, and store in variable
vsluiter 0:34a08ea1e3fc 17 tijd = pot.read();
vsluiter 0:34a08ea1e3fc 18 //make pin myled 'high', which means 3.3V. This turns off the LED
vsluiter 0:34a08ea1e3fc 19 myled = 1;
vsluiter 0:34a08ea1e3fc 20 //Wait takes seconds as argument ( wait(2.5) waits for 2 seconds)
vsluiter 0:34a08ea1e3fc 21 //in this case, we're waiting 0.5 seconds if the potmeter is in one end position (analog in has value 1.00)
vsluiter 0:34a08ea1e3fc 22 // and we're waiting zero seconds if the potmeter is in the other end position (analog in has value 0.00)
vsluiter 0:34a08ea1e3fc 23 wait(0.5*tijd);
vsluiter 0:34a08ea1e3fc 24 //make pin myled 'low', which means 0V. This turns on the LED
vsluiter 0:34a08ea1e3fc 25 myled = 0;
vsluiter 0:34a08ea1e3fc 26 //wait depending on 'tijd', inverse operation of other wait statement, so total time will always be 0.5
vsluiter 0:34a08ea1e3fc 27 wait(0.5*(1-tijd));
vsluiter 0:34a08ea1e3fc 28 }
vsluiter 0:34a08ea1e3fc 29 }