1 | /////////////////////////////////////////////////////////////////
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2 | // ESP32 E-PAPER THERMOMETER 10/22/2020 v1.01 //
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3 | // Get the latest version of the code here: //
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4 | // http://educ8s.tv/esp32-e-paper-thermometer //
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5 | /////////////////////////////////////////////////////////////////
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6 |
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7 | #include <GxEPD.h>
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8 | #include <GxGDEP015OC1/GxGDEP015OC1.h>
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9 | #include <GxIO/GxIO_SPI/GxIO_SPI.h>
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10 | #include <GxIO/GxIO.h>
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11 |
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12 | #include <OneWire.h>
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13 | #include <DallasTemperature.h>
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14 | #include "BitmapGraphics.h"
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15 |
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16 | #include <Fonts/FreeSansBold24pt7b.h>
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17 |
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18 | #define ONE_WIRE_BUS 15
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19 |
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20 | boolean METRIC = true; //Set true for metric system; false for imperial
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21 | float previousTemperature = -100.0;
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22 | float temperature = 0;
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23 |
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24 | OneWire oneWire(ONE_WIRE_BUS);
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25 | DallasTemperature sensors(&oneWire);
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26 |
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27 | GxIO_Class io(SPI, SS, 22, 21);
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28 | GxEPD_Class display(io, 16, 4);
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29 |
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30 | void setup() {
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31 |
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32 | Serial.begin(9600);
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33 | display.init();
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34 | sensors.begin();
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35 |
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36 | display.drawExampleBitmap(gImage_splash, 0, 0, 200, 200, GxEPD_BLACK);
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37 | display.update();
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38 | delay(3000);
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39 |
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40 | if(METRIC)
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41 | {
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42 | display.drawExampleBitmap(gImage_gui, 0, 0, 200, 200, GxEPD_BLACK);
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43 | }else
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44 | {
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45 | display.drawExampleBitmap(gImage_gui_f, 0, 0, 200, 200, GxEPD_BLACK);
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46 | }
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47 |
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48 | display.update();
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49 |
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50 | if(METRIC)
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51 | {
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52 | display.drawExampleBitmap(gImage_gui, sizeof(gImage_gui), GxEPD::bm_default | GxEPD::bm_partial_update);
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53 | }else
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54 | {
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55 | display.drawExampleBitmap(gImage_gui_f, sizeof(gImage_gui_f), GxEPD::bm_default | GxEPD::bm_partial_update);
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56 | }
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57 | }
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58 |
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59 | void loop()
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60 | {
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61 | previousTemperature = temperature;
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62 | temperature = getTemperatureFromSensor();
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63 |
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64 | if(previousTemperature!=temperature)
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65 | {
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66 | showPartialUpdate(temperature);
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67 | }
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68 |
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69 | printTemperatureToSerial();
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70 | delay(5000);
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71 | }
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72 |
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73 | float getTemperatureFromSensor()
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74 | {
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75 | float temperature = 0;
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76 | sensors.requestTemperatures();
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77 | if(METRIC)
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78 | {
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79 | temperature = sensors.getTempCByIndex(0);
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80 | }else
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81 | {
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82 | temperature = sensors.getTempFByIndex(0);
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83 | }
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84 | temperature = round(temperature * 10) / 10;
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85 | return temperature;
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86 | }
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87 |
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88 | void showPartialUpdate(float temperature)
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89 | {
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90 | Serial.println("Updating display ...");
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91 | String temperatureString = String(temperature,1);
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92 | const char* name = "FreeSansBold24pt7b";
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93 | const GFXfont* f = &FreeSansBold24pt7b;
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94 |
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95 | uint16_t box_x = 60;
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96 | uint16_t box_y = 60;
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97 | uint16_t box_w = 90;
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98 | uint16_t box_h = 100;
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99 | uint16_t cursor_y = box_y + 16;
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100 |
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101 | display.setRotation(45);
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102 | display.setFont(f);
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103 | display.setTextColor(GxEPD_BLACK);
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104 |
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105 | display.fillRect(box_x, box_y, box_w, box_h, GxEPD_WHITE);
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106 | display.setCursor(box_x, cursor_y+38);
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107 | display.print(temperatureString);
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108 | display.updateWindow(box_x, box_y, box_w, box_h, true);
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109 | }
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110 |
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111 | void printTemperatureToSerial()
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112 | {
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113 | Serial.print(temperature);
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114 | Serial.print(" C");
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115 | Serial.print("\n");
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116 | }
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