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19
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1 /*
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2 note that the chip in this arduino has been replaced with a '328
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3 */
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4 #include "ST7565.h"
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5 #include <OneWire.h>
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6 #include <DallasTemperature.h>
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7
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8 #define BACKLIGHT_LED 10
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9
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10 ST7565 glcd(9, 8, 7, 6, 5);
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11
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12 OneWire oneWire(3); // digital IO 3
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13 DallasTemperature sensors(&oneWire);
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14 DeviceAddress tempSensorAddress;
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15 #define NUM_TEMPERATURE_RETRIES 5
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16
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17 char newtxt[21*8+1];
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18 unsigned int written;
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19 unsigned char cmd;
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20
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21 #define GETHEADER -2
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22 #define GETCOMMAND -1
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23
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24 void setup() {
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25 Serial.begin(9600);
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26 Serial.flush();
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27
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28 pinMode(11, INPUT); // low means door is closed
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29 digitalWrite(11, HIGH);
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30
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31 pinMode(12, OUTPUT);
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32 digitalWrite(12, LOW);
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33
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34 pinMode(BACKLIGHT_LED, OUTPUT);
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35 analogWrite(BACKLIGHT_LED, 200);
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36
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37 glcd.st7565_init();
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38 glcd.st7565_command(CMD_DISPLAY_ON);
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39 glcd.st7565_command(CMD_SET_ALLPTS_NORMAL);
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40 glcd.st7565_set_brightness(0x18);
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41
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42 glcd.display(); // show splashscreen
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43
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44 newtxt[21*8] = 0;
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45 written = GETHEADER; // GETHEADER --recv 0xff--> GETCOMMAND --recv 0x00--> 0
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46 }
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47
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48 void initSensors() {
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49 sensors.begin();
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50 sensors.getAddress(tempSensorAddress, 0);
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51 sensors.setResolution(tempSensorAddress, 12);
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52 }
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53
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54 void loop() {
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55 /*
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56 send 0xff 0x00,
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57 then up to 21*8 bytes of text to replace the display, with a null terminator.
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58
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59 or 0xff 0x01, then get back '0\n' or '1\n' for the door sensor
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60
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61 or 0xff 0x02, then get back temperature followed by newline
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62
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63 or 0xff 0x03 then a byte for the screen brightness
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64
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65 or 0xff 0x0f then 00 or 01 to set the front lights on pin 12
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66 */
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67 float newTemp;
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68 int i, printed;
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69 int inb = Serial.read();
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70 if (inb == -1) {
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71 return;
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72 }
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73
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74 if (written == GETHEADER) {
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75 if (inb == 0xff) {
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76 written = GETCOMMAND;
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77 }
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78 }
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79 else if(written == GETCOMMAND) {
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80 cmd = inb;
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81
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82 switch(cmd) {
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83 case 0:
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84 written = 0; // get chars below
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85 return;
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86
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87 case 1:
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88 Serial.print(digitalRead(11) ?
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89 "{\"door\":\"open\"}\n" :
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90 "{\"door\":\"closed\"}\n");
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91 written = GETHEADER;
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92 return;
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93
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94 case 2:
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95
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96 for (i=0; i<NUM_TEMPERATURE_RETRIES; i++) {
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97
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98 sensors.requestTemperatures();
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99 newTemp = sensors.getTempF(tempSensorAddress);
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100 if (i < NUM_TEMPERATURE_RETRIES-1 &&
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101 (newTemp < -100 || newTemp > 180)) {
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102 // too many errors that were fixed by restarting arduino.
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103 // trying repeating this much init
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104 initSensors();
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105 continue;
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106 }
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107 Serial.print("{\"temp\":");
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108 Serial.print(newTemp);
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109 Serial.print(", \"retries\":");
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110 Serial.print(i);
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111 Serial.print("}\n");
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112 break;
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113 }
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114 written = GETHEADER;
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115 return;
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116
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117 case 3:
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118 case 4:
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119 written = 0; // these are handled below
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120 return;
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121
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122 // otherwise take chars
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123 }
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124 }
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125 else {
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126 if (cmd == 3) {
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127 analogWrite(BACKLIGHT_LED, 255 - inb);
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128 written = GETHEADER;
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129 return;
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130 }
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131 if (cmd == 4) {
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132 digitalWrite(12, inb);
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133 written = GETHEADER;
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134 return;
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135 }
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136 newtxt[written] = inb;
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137 written++;
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138
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139 if (inb == 0 || (written > 21 * 8)) {
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140 glcd.clear();
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141 glcd.drawstring(0,0, newtxt);
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142 glcd.display();
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143
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144 written = GETHEADER;
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145 return;
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146 }
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147 }
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148 }
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149
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150
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151
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152
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153
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154
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