Winnie Cloud
/
Automaticfan_TuYawen
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Revision 0:fbcee9f83f42, committed 2020-06-06
- Comitter:
- cloudywinnie
- Date:
- Sat Jun 06 13:42:26 2020 +0000
- Commit message:
- Tu_Yawen Automatic fan
Changed in this revision
diff -r 000000000000 -r fbcee9f83f42 TextLCD.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Sat Jun 06 13:42:26 2020 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/simon/code/TextLCD/#308d188a2d3a
diff -r 000000000000 -r fbcee9f83f42 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Jun 06 13:42:26 2020 +0000
@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "TextLCD.h"
+
+PwmOut motor(p21); //Control the speed of the fan
+DigitalInOut DHT11(p5); // Activate digital in as dht11 Pin
+TextLCD lcd(p6, p7, p14, p15, p16, p17); // rs, e, d4-d7
+
+
+Timer tmr; //initialize timer
+uint64_t adat; // 64 bit variable for temporary data
+int i;
+void dht_read(void) {
+ DHT11.output(); // Set p5 as output
+ // Initialize measurement > 18 ms low
+ DHT11 = 0;
+ wait_ms(20);
+ // After high and release the pin switch input mode
+ DHT11 = 1;
+ DHT11.input();
+ // Wait until the end of 80 us low
+ while(!DHT11.read()) {}
+ // Wait until end of 80 us high
+ while(DHT11.read()) {}
+ // 40 bit, 40 read out cycle
+ for(i=0; i<40; i++) {
+ adat = adat << 1; // Shift for new number
+ tmr.stop(); // Stop timer if runs
+ tmr.reset(); // Reset timer
+ // Wait until pin
+ while(!DHT11.read()) {}
+ tmr.start();
+ while(DHT11.read()) {}
+ // If DHT11 HIGH longer than 40 micro seconds (hopefully 70 us)
+ if(tmr.read_us() > 40) {
+ // bit is 1
+ adat++;
+ }
+ }
+}
+
+int main() {
+ while(1) {
+ adat = 0;
+ motor.period(0.010);
+ dht_read(); // Call the function
+ int tem = (adat & 0x0000000000ff0000) >> 16;
+ lcd.printf("Temperature:");
+ lcd.printf("%d\n",tem); // Temperature
+ if(tem <= 20){
+ motor = 0;
+ lcd.locate(4,1);
+ lcd.printf("Fan OFF");
+ }
+ else if(tem > 20 && tem <= 22) {
+ motor = 0.2;
+ lcd.printf("Fan Speed:");
+ lcd.locate(12,1);
+ lcd.printf("20%");
+ }
+ else if(tem > 22 && tem <= 24) {
+ motor = 0.4;
+ lcd.printf("Fan Speed:");
+ lcd.locate(12,1);
+ lcd.printf("40%");
+ }
+ else if(tem > 24 && tem <= 26) {
+ motor = 0.6;
+ lcd.printf("Fan Speed:");
+ lcd.locate(12,1);
+ lcd.printf("60%");
+ }
+ else if(tem > 26 && tem <= 28) {
+ motor = 0.8;
+ lcd.printf("Fan Speed:");
+ lcd.locate(12,1);
+ lcd.printf("80%");
+ }
+ else {
+ motor = 1;
+ lcd.printf("Fan Speed:");
+ lcd.locate(12,1);
+ lcd.printf("100%");
+ }
+ wait(2); // Wait 2 sec till continue.
+ lcd.cls(); // Clear the screen
+ }
+}
\ No newline at end of file
diff -r 000000000000 -r fbcee9f83f42 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Jun 06 13:42:26 2020 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400 \ No newline at end of file