Ro Led / Mbed 2 deprecated Nucleo_DHT11_Sensor_Example

This is an example program to fetch data of DHT11 Sensors

Dependencies:   mbed

Fork of DHT11_with_Nucleo by Adatgy2014

main.cpp@4:62b680fac6ed, 2015-01-06 (annotated)

Committer:
kaliczp
Date:
Tue Jan 06 00:48:44 2015 +0000
Revision:
4:62b680fac6ed
Parent:
3:6228ab73d420
Child:
5:76a9332af64c
Let's use UART!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kaliczp 0:e8a1a503d390 1 #include "mbed.h"
kaliczp 0:e8a1a503d390 2
kaliczp 2:4469aa7f4995 3 DigitalOut myled(LED1); // Activate LED
kaliczp 2:4469aa7f4995 4 DigitalIn mybutton(USER_BUTTON); // Activate button
kaliczp 2:4469aa7f4995 5 DigitalInOut data_pin(A0); // Activate digital in
kaliczp 4:62b680fac6ed 6 Serial pc(SERIAL_TX, SERIAL_RX); // Initialize UART connection
kaliczp 4:62b680fac6ed 7 // Use a terminal program (eg. TeraTerm).
kaliczp 0:e8a1a503d390 8
kaliczp 3:6228ab73d420 9 // Function to initialize DHT11
kaliczp 3:6228ab73d420 10 void dht_read(void) {
kaliczp 3:6228ab73d420 11 data_pin.output(); // Set A0 as output
kaliczp 3:6228ab73d420 12 // Initialize measurement > 18 ms low
kaliczp 3:6228ab73d420 13 data_pin = 0;
kaliczp 3:6228ab73d420 14 wait_ms(20);
kaliczp 3:6228ab73d420 15 // After high and release the pin switch input mode
kaliczp 3:6228ab73d420 16 data_pin = 1;
kaliczp 4:62b680fac6ed 17 data_pin.input();
kaliczp 3:6228ab73d420 18 }
kaliczp 3:6228ab73d420 19
kaliczp 0:e8a1a503d390 20 int main() {
kaliczp 4:62b680fac6ed 21 pc.printf("Read the DHT11 temperature and humidity sensor!\n"); //Welcome message
kaliczp 0:e8a1a503d390 22 while(1) {
kaliczp 1:c0c5b5860aa8 23 if (mybutton == 0) { // Button is pressed
kaliczp 1:c0c5b5860aa8 24 myled = 1; // LED is ON
kaliczp 3:6228ab73d420 25 dht_read(); // Call the function
kaliczp 2:4469aa7f4995 26 wait_ms(200); // Wait 0.2 sec till continue.
kaliczp 1:c0c5b5860aa8 27 } else {
kaliczp 1:c0c5b5860aa8 28 myled = 0; // LED is OFF
kaliczp 1:c0c5b5860aa8 29 }
kaliczp 0:e8a1a503d390 30 }
kaliczp 0:e8a1a503d390 31 }