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--- en:iot-open:remotelab:sut:generalpurpose3 [2021/02/27 09:45] – [Sensors] pczekalski
+++ en:iot-open:remotelab:sut:generalpurpose3 [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 108: / Line 108: @@
 ===== Support =====
-piotr.czekalski@polsl.pl
+In case the LCD display hangs and you are sure that your code should work but it does not, it may be the case the I2C bus is stuck and hang the I2C to LCD controller converter.\\
+In this case, please use the following code to reset the I2C bus (you can embed it to your source code or run separately, then run your original code, again). Mind to use appropriate I2C address, regarding the node booked (nodes 8 and 9 are using 0x3F, nodes 10 and 11 use 0x27):
+<code c>
+#include <Arduino.h>
+#include <LiquidCrystal_I2C.h>
+LiquidCrystal_I2C lcd(0x3F,20,4);  // set the LCD address to 0x27 for nodes 10 and 11
+void setup()
+{
+  pinMode(4,OUTPUT);
+  pinMode(5, OUTPUT);
+  digitalWrite(4,LOW);
+  digitalWrite(5,LOW);
+  delay(2000);
+  pinMode(5, INPUT);       // reset pin
+  pinMode(4, INPUT);
+  delay(2050);
+  lcd.init(D2,D1);
+  lcd.backlight();
+  lcd.home();
+  lcd.print("Hello world...");
+}
+void loop()
+{
+}
+</code>
+Finally, you should see Hello World message on the LCD and I2C bus should be recovered now.

en/iot-open/remotelab/sut/generalpurpose3.1614419122.txt.gz · Last modified: 2021/02/27 10:00 (external edit)