OLED 0.49"

The OLED 0.49" extension board is based on the SSD1306 0.49" 14pin OLED display with 64x32 pixels. The display uses I2C to communicate with the Picoclick (SDA = GPIO2, SCL = GPIO8). It uses the 3.3V power supply of the Picoclick and thus is only active when the Picoclick is activated.

The extension connector is underneath the display.

Hardware

Overview

Technical drawing

Measurements in mm, grid is 0.5mm

• PCB: 18mm x 13mm

• Thickness: 1mm

• Corner radius: 2mm

Schematics

Software

Hardwaretest can be found on Github.

#include <Arduino.h>
#include <WiFi.h>
#include <FastLED.h>
#include <U8g2lib.h>
#include <Wire.h>
#include "config.h"

U8G2_SSD1306_64X32_1F_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

struct fonts {
  const uint8_t* font;
  int width;
  int height;
};

enum box_alignment {
  Center,
  Left,
  Right
};

fonts font_xl = {u8g2_font_profont29_mf, 16, 19};
fonts font_m = {u8g2_font_profont17_mf, 9, 11};
fonts font_s = {u8g2_font_profont12_mf, 6, 8};
fonts font_xs = {u8g2_font_profont10_mf, 5, 6};

int left = 0, width = 64, top = 0, height = 32;

u8g2_uint_t scrolling_offset = 0;
u8g2_uint_t scrolling_width;
const char *scrolling_text = "makermoekoe ";

void print_text(String str, fonts f, box_alignment align, float pos) {
  u8g2.setFont(f.font);
  int x = 0;
  if(align == Center) x = left + 0.5 * (width - (f.width * str.length() - 1));
  else if(align == Left) x = left + 5;
  else if(align == Right) x = left + width - f.width * str.length() - 5;
  u8g2.firstPage();  
  do{
    u8g2.drawStr(x, top + pos * height + f.height / 2, str.c_str());
  } while(u8g2.nextPage());
}

void setup(){
  pinMode(BUTTON_PIN, INPUT);
  pinMode(ADC_ENABLE_PIN, OUTPUT);
  pinMode(ADC_PIN, INPUT);
  analogReadResolution(12);
  digitalWrite(ADC_ENABLE_PIN, HIGH);

  WiFi.mode(WIFI_OFF);

  FastLED.addLeds<APA102, APA102_SDI_PIN, APA102_CLK_PIN, BGR>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(100);
  delay(50);

  set_fastled(CRGB::Blue);

  Wire.begin(SDA_PIN, SCL_PIN);
  delay(100);
  u8g2.begin();
  delay(100);
  print_text("HEY", font_xl, Center, 0.5);
  delay(1000);

  scrolling_width = u8g2.getUTF8Width(scrolling_text);		// calculate the pixel width of the text
}

unsigned long t_display = 0;

void loop() {
  if(digitalRead(BUTTON_PIN) == 1){
    set_fastled(CRGB::Red);
    print_text("BYE", font_xl, Center, 0.5);
    delay(1000);
    esp_deep_sleep_start();
  }

  if(millis() >= t_display + 15){
    t_display = millis();
    u8g2_uint_t x;
  
    u8g2.firstPage();
    do{
      // draw the scrolling text at current offset
      x = scrolling_offset + 64;
      u8g2.setFont(font_m.font);		// set the target font
      do{								// repeated drawing of the scrolling text...
        u8g2.drawUTF8(x, 20, scrolling_text);			// draw the scolling text
        x += scrolling_width;						// add the pixel width of the scrolling text
      } while(x < 64);		// draw again until the complete display is filled
      
    } while(u8g2.nextPage() );
    
    scrolling_offset-=1;							// scroll by one pixel
    if((u8g2_uint_t)scrolling_offset < (u8g2_uint_t)-scrolling_width){
      scrolling_offset = 0;							// start over again
    }
  }
}