Sergey Frolov
Demo for button and backlight use with Arduino LCD Keypad Shield (HD44780) and similar 16x2 hardware clones. Press 'Up' or 'Down' button to ON or OFF backlight. Build and test with STM32 Nucleo F411RE.
Revision 0:8f6ff5bb5a2d, committed 2015-12-23
- Comitter:
- werwolf_lg
- Date:
- Wed Dec 23 16:58:19 2015 +0000
- Commit message:
- First version demo for Arduino LCD Keypad Shield and STM32 Nucleo
Changed in this revision
diff -r 000000000000 -r 8f6ff5bb5a2d TextLCD.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Wed Dec 23 16:58:19 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#308d188a2d3a
diff -r 000000000000 -r 8f6ff5bb5a2d main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Dec 23 16:58:19 2015 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+#include "TextLCD.h"
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+AnalogIn button(A0); // Init button (SELECT, LEFT, UP, DOWN, RIGHT)
+// LCD (RS, E, D4, D5, D6, D7);
+TextLCD lcd(D8, D9, D4, D5, D6, D7);
+PwmOut backlight(D10); // Backlight LCD
+DigitalOut led(LED1);
+
+int main() {
+
+ // Set backlight period and duty cycle
+ backlight.period(0.002);
+ backlight = 1;
+
+
+ lcd.cls(); // Clear LCD
+ lcd.locate(1,0); // Set locate (1 row, 2 column)
+ lcd.printf("LCD Key Shield");
+ wait(1);
+
+ int meas;
+
+ while(1) {
+ led = (led == 1) ? 0 : 1;
+
+ meas = button.read() * 1000; // Read the analog input value (value from 0.0 to 1.0) and convert to int value (from 0 to 1000)
+
+ lcd.cls();
+ lcd.locate(0,0);
+ lcd.printf("Press button");
+ lcd.locate(0,1);
+
+ if (meas < 50) {
+ lcd.printf("BUTTON: Right ");
+ backlight = 0.5; // Set 50% backlight
+ }
+ else if (meas < 210) {
+ lcd.printf("BUTTON: Up");
+ backlight = 1; // Power ON backlight
+ }
+ else if (meas < 460){
+ lcd.printf("BUTTON: Down");
+ backlight = 0; // Power OFF backlight
+ }
+ else if (meas < 720){
+ lcd.printf("BUTTON: Left");
+ }
+ else if (meas > 950){
+ lcd.printf("BUTTON: Select");
+ }
+ pc.printf("BUTTON: %4d\n", meas);
+
+ wait(0.1);
+ }
+}
\ No newline at end of file
diff -r 000000000000 -r 8f6ff5bb5a2d mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Dec 23 16:58:19 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4336505e4b1c \ No newline at end of file