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arduino-cli/libraries/Adafruit_LED_Backpack_Library/examples/bargraph24/bargraph24.ino

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+/*************************************************** 
+  This is a library for our I2C LED Backpacks
+
+  Designed specifically to work with the Adafruit LED 24 Bargraph Backpack
+  ----> http://www.adafruit.com/products/721
+
+  These displays use I2C to communicate, 2 pins are required to 
+  interface. There are multiple selectable I2C addresses. For backpacks
+  with 2 Address Select pins: 0x70, 0x71, 0x72 or 0x73. For backpacks
+  with 3 Address Select pins: 0x70 thru 0x77
+
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include "Adafruit_LEDBackpack.h"
+
+Adafruit_24bargraph bar = Adafruit_24bargraph();
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("HT16K33 Bi-Color Bargraph test");
+  
+  bar.begin(0x70);  // pass in the address
+
+  for (uint8_t b=0; b<24; b++ ){
+    if ((b % 3) == 0)  bar.setBar(b, LED_RED);
+    if ((b % 3) == 1)  bar.setBar(b, LED_YELLOW);
+    if ((b % 3) == 2)  bar.setBar(b, LED_GREEN);
+  }
+  bar.writeDisplay();
+  delay(2000);
+}
+
+
+void loop() {
+ for (uint8_t b=0; b<24; b++) {
+   bar.setBar(b, LED_RED);
+   bar.writeDisplay();
+   delay(50);
+   bar.setBar(b, LED_OFF);
+   bar.writeDisplay();
+ }
+  for (uint8_t b=0; b<24; b++) {
+   bar.setBar(b, LED_GREEN);
+   bar.writeDisplay();
+   delay(50);
+   bar.setBar(b, LED_OFF);
+   bar.writeDisplay();
+ }
+
+ for (uint8_t b=0; b<24; b++) {
+   bar.setBar(23-b, LED_YELLOW);
+   bar.writeDisplay();
+   delay(50);
+   bar.setBar(23-b, LED_OFF);
+   bar.writeDisplay();
+ }
+}