ESP8266: HT-16k33 7 Segment I2C Test

 

ESP8266: HT-16k33 7 Segment I2C Test

 

 

Connection:

– NodeMCU GPIO0 -> D1 -> SCL (HT-16k33)
– NodeMCU GPIO4 -> D2 -> SDA (HT-16k33)
– NodeMCU +3.3 -> 3V3 -> VCC (HT-16k33)
– NodeMCU GND -> GND -> GND (HT-16k33)

 

Library:

https://github.com/adafruit/Adafruit_LED_Backpack 

 

Arduino code:

/*************************************************** 
This is a library for our I2C LED Backpacks

Designed specifically to work with the Adafruit LED 7-Segment backpacks 
----> http://www.adafruit.com/products/881
----> http://www.adafruit.com/products/880
----> http://www.adafruit.com/products/879
----> http://www.adafruit.com/products/878

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
****************************************************/

// Enable one of these two #includes and comment out the other.
// Conditional #include doesn't work due to Arduino IDE shenanigans.
#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.
//#include <TinyWireM.h> // Enable this line if using Adafruit Trinket, Gemma, etc.

#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_7segment matrix = Adafruit_7segment();

void setup() {
#ifndef __AVR_ATtiny85__
Serial.begin(9600);
Serial.println("7 Segment Backpack Test");
#endif
matrix.begin(0x70);
}

void loop() {


// print a hex number
matrix.print(0xBEEF, HEX);
matrix.writeDisplay();
delay(500);

// print a floating point 
matrix.print(12.34);
matrix.writeDisplay();
delay(500);

// print with print/println
for (uint16_t counter = 0; counter < 9999; counter++) {
matrix.println(counter);
matrix.writeDisplay();
delay(10);
}

// method #2 - draw each digit
uint16_t blinkcounter = 0;
boolean drawDots = false;
for (uint16_t counter = 0; counter < 9999; counter ++) {
matrix.writeDigitNum(0, (counter / 1000), drawDots);
matrix.writeDigitNum(1, (counter / 100) % 10, drawDots);
matrix.drawColon(drawDots);
matrix.writeDigitNum(3, (counter / 10) % 10, drawDots);
matrix.writeDigitNum(4, counter % 10, drawDots);

blinkcounter+=50;
if (blinkcounter < 500) {
drawDots = false;
} else if (blinkcounter < 1000) {
drawDots = true;
} else {
blinkcounter = 0;
}
matrix.writeDisplay();
delay(10);
}
}