+// see blog entry at http://tech.scargill.net/uninterruptable-supplies/
+This Code has extra features
+including a XY positioning function on Display
+and a Line Draw function on Nokia 3310 LCD
+It is modded from the original
+http://playground.arduino.cc/Code/PCD8544
+// jim(^dOt^)buzz(^aT^)gmail(^dOt^)com
+// hope it works for you
+#define PIN_PWM 9 // backlight
+#define PIN_SCE 6 // LCD CS .... Pin 3
+#define PIN_RESET 7 // LCD RST .... Pin 1
+#define PIN_DC 5 // LCD Dat/Com. Pin 5
+#define PIN_SDIN 4 // LCD SPIDat . Pin 6
+#define PIN_SCLK 3 // LCD SPIClk . Pin 4
+static const byte ASCII[][5] =
+ {0x00, 0x00, 0x00, 0x00, 0x00} // 20
+,{0x00, 0x00, 0x5f, 0x00, 0x00} // 21 !
+,{0x00, 0x07, 0x00, 0x07, 0x00} // 22 "
+,{0x14, 0x7f, 0x14, 0x7f, 0x14} // 23 #
+,{0x24, 0x2a, 0x7f, 0x2a, 0x12} // 24 $
+,{0x23, 0x13, 0x08, 0x64, 0x62} // 25 %
+,{0x36, 0x49, 0x55, 0x22, 0x50} // 26 &
+,{0x00, 0x05, 0x03, 0x00, 0x00} // 27 '
+,{0x00, 0x1c, 0x22, 0x41, 0x00} // 28 (
+,{0x00, 0x41, 0x22, 0x1c, 0x00} // 29 )
+,{0x14, 0x08, 0x3e, 0x08, 0x14} // 2a *
+,{0x08, 0x08, 0x3e, 0x08, 0x08} // 2b +
+,{0x00, 0x50, 0x30, 0x00, 0x00} // 2c ,
+,{0x08, 0x08, 0x08, 0x08, 0x08} // 2d -
+,{0x00, 0x60, 0x60, 0x00, 0x00} // 2e .
+,{0x20, 0x10, 0x08, 0x04, 0x02} // 2f /
+,{0x3e, 0x51, 0x49, 0x45, 0x3e} // 30 0
+,{0x00, 0x42, 0x7f, 0x40, 0x00} // 31 1
+,{0x42, 0x61, 0x51, 0x49, 0x46} // 32 2
+,{0x21, 0x41, 0x45, 0x4b, 0x31} // 33 3
+,{0x18, 0x14, 0x12, 0x7f, 0x10} // 34 4
+,{0x27, 0x45, 0x45, 0x45, 0x39} // 35 5
+,{0x3c, 0x4a, 0x49, 0x49, 0x30} // 36 6
+,{0x01, 0x71, 0x09, 0x05, 0x03} // 37 7
+,{0x36, 0x49, 0x49, 0x49, 0x36} // 38 8
+,{0x06, 0x49, 0x49, 0x29, 0x1e} // 39 9
+,{0x00, 0x36, 0x36, 0x00, 0x00} // 3a :
+,{0x00, 0x56, 0x36, 0x00, 0x00} // 3b ;
+,{0x08, 0x14, 0x22, 0x41, 0x00} // 3c <
+,{0x14, 0x14, 0x14, 0x14, 0x14} // 3d =
+,{0x00, 0x41, 0x22, 0x14, 0x08} // 3e >
+,{0x02, 0x01, 0x51, 0x09, 0x06} // 3f ?
+,{0x32, 0x49, 0x79, 0x41, 0x3e} // 40 @
+,{0x7e, 0x11, 0x11, 0x11, 0x7e} // 41 A
+,{0x7f, 0x49, 0x49, 0x49, 0x36} // 42 B
+,{0x3e, 0x41, 0x41, 0x41, 0x22} // 43 C
+,{0x7f, 0x41, 0x41, 0x22, 0x1c} // 44 D
+,{0x7f, 0x49, 0x49, 0x49, 0x41} // 45 E
+,{0x7f, 0x09, 0x09, 0x09, 0x01} // 46 F
+,{0x3e, 0x41, 0x49, 0x49, 0x7a} // 47 G
+,{0x7f, 0x08, 0x08, 0x08, 0x7f} // 48 H
+,{0x00, 0x41, 0x7f, 0x41, 0x00} // 49 I
+,{0x20, 0x40, 0x41, 0x3f, 0x01} // 4a J
+,{0x7f, 0x08, 0x14, 0x22, 0x41} // 4b K
+,{0x7f, 0x40, 0x40, 0x40, 0x40} // 4c L
+,{0x7f, 0x02, 0x0c, 0x02, 0x7f} // 4d M
+,{0x7f, 0x04, 0x08, 0x10, 0x7f} // 4e N
+,{0x3e, 0x41, 0x41, 0x41, 0x3e} // 4f O
+,{0x7f, 0x09, 0x09, 0x09, 0x06} // 50 P
+,{0x3e, 0x41, 0x51, 0x21, 0x5e} // 51 Q
+,{0x7f, 0x09, 0x19, 0x29, 0x46} // 52 R
+,{0x46, 0x49, 0x49, 0x49, 0x31} // 53 S
+,{0x01, 0x01, 0x7f, 0x01, 0x01} // 54 T
+,{0x3f, 0x40, 0x40, 0x40, 0x3f} // 55 U
+,{0x1f, 0x20, 0x40, 0x20, 0x1f} // 56 V
+,{0x3f, 0x40, 0x38, 0x40, 0x3f} // 57 W
+,{0x63, 0x14, 0x08, 0x14, 0x63} // 58 X
+,{0x07, 0x08, 0x70, 0x08, 0x07} // 59 Y
+,{0x61, 0x51, 0x49, 0x45, 0x43} // 5a Z
+,{0x00, 0x7f, 0x41, 0x41, 0x00} // 5b [
+,{0x02, 0x04, 0x08, 0x10, 0x20} // 5c ¥
+,{0x00, 0x41, 0x41, 0x7f, 0x00} // 5d ]
+,{0x04, 0x02, 0x01, 0x02, 0x04} // 5e ^
+,{0x40, 0x40, 0x40, 0x40, 0x40} // 5f _
+,{0x00, 0x01, 0x02, 0x04, 0x00} // 60 `
+,{0x20, 0x54, 0x54, 0x54, 0x78} // 61 a
+,{0x7f, 0x48, 0x44, 0x44, 0x38} // 62 b
+,{0x38, 0x44, 0x44, 0x44, 0x20} // 63 c
+,{0x38, 0x44, 0x44, 0x48, 0x7f} // 64 d
+,{0x38, 0x54, 0x54, 0x54, 0x18} // 65 e
+,{0x08, 0x7e, 0x09, 0x01, 0x02} // 66 f
+,{0x0c, 0x52, 0x52, 0x52, 0x3e} // 67 g
+,{0x7f, 0x08, 0x04, 0x04, 0x78} // 68 h
+,{0x00, 0x44, 0x7d, 0x40, 0x00} // 69 i
+,{0x20, 0x40, 0x44, 0x3d, 0x00} // 6a j
+,{0x7f, 0x10, 0x28, 0x44, 0x00} // 6b k
+,{0x00, 0x41, 0x7f, 0x40, 0x00} // 6c l
+,{0x7c, 0x04, 0x18, 0x04, 0x78} // 6d m
+,{0x7c, 0x08, 0x04, 0x04, 0x78} // 6e n
+,{0x38, 0x44, 0x44, 0x44, 0x38} // 6f o
+,{0x7c, 0x14, 0x14, 0x14, 0x08} // 70 p
+,{0x08, 0x14, 0x14, 0x18, 0x7c} // 71 q
+,{0x7c, 0x08, 0x04, 0x04, 0x08} // 72 r
+,{0x48, 0x54, 0x54, 0x54, 0x20} // 73 s
+,{0x04, 0x3f, 0x44, 0x40, 0x20} // 74 t
+,{0x3c, 0x40, 0x40, 0x20, 0x7c} // 75 u
+,{0x1c, 0x20, 0x40, 0x20, 0x1c} // 76 v
+,{0x3c, 0x40, 0x30, 0x40, 0x3c} // 77 w
+,{0x44, 0x28, 0x10, 0x28, 0x44} // 78 x
+,{0x0c, 0x50, 0x50, 0x50, 0x3c} // 79 y
+,{0x44, 0x64, 0x54, 0x4c, 0x44} // 7a z
+,{0x00, 0x08, 0x36, 0x41, 0x00} // 7b {
+,{0x00, 0x00, 0x7f, 0x00, 0x00} // 7c |
+,{0x00, 0x41, 0x36, 0x08, 0x00} // 7d }
+,{0x10, 0x08, 0x08, 0x10, 0x08} // 7e ←
+,{0x00, 0x06, 0x09, 0x09, 0x06} // 7f →
+void LcdCharacter(char character)
+ for (int index = 0; index < 5; index++)
+ LcdWrite(LCD_D, ASCII[character - 0x20][index]);
+ for (int index = 0; index < LCD_X * LCD_Y / 8; index++)
+void LcdInitialise(void)
+ pinMode(PIN_SCE, OUTPUT);
+ pinMode(PIN_RESET, OUTPUT);
+ pinMode(PIN_DC, OUTPUT);
+ pinMode(PIN_SDIN, OUTPUT);
+ pinMode(PIN_SCLK, OUTPUT);
+ pinMode(PIN_PWM, OUTPUT);
+ analogWrite(PIN_PWM,255);
+ digitalWrite(PIN_RESET, LOW);
+ digitalWrite(PIN_RESET, HIGH);
+ LcdWrite( LCD_CMD, 0x21 ); // LCD Extended Commands.
+ LcdWrite( LCD_CMD, 0xB1); // Set LCD Vop (Contrast). //B1
+ LcdWrite( LCD_CMD, 0x04 ); // Set Temp coefficent. //0x04
+ LcdWrite( LCD_CMD, 0x14 ); // LCD bias mode 1:48. //0x13
+ LcdWrite( LCD_CMD, 0x0C ); // LCD in normal mode. 0x0d for inverse
+void LcdString(char *characters)
+ LcdCharacter(*characters++);
+void LcdWrite(byte dc, byte data)
+ digitalWrite(PIN_DC, dc);
+ digitalWrite(PIN_SCE, LOW);
+ shiftOut(PIN_SDIN, PIN_SCLK, MSBFIRST, data);
+ digitalWrite(PIN_SCE, HIGH);
+// gotoXY routine to position cursor
+void gotoXY(int x, int y)
+ LcdWrite( 0, 0x80 | x); // Column.
+ LcdWrite( 0, 0x40 | y); // Row.
+void LcdP(char *fmt, ...)
+ char buf[128]; // resulting string limited to 128 chars
+ vsnprintf(buf, 128, fmt, args);
+uint8_t state = 0; // 0 is power up, 1 is on, 2 is turning off
+uint16_t lightOnSet = 2;
+uint16_t lightOffSet = 1022;
+char *theState = "standby";
+ // read the input on analog pin 0
+ int sensorValue = analogRead(A0);
+ // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
+ float vols = sensorValue * (5.0 / 1023.0);
+ // print out the value you read:
+ char buf[128]; // resulting string limited to 128 chars
+ vsnprintf(buf, 128, fmt, args);
+ // put your setup code here, to run once:
+ digitalWrite(LIGHT, LOW);
+ digitalWrite(RELAY, LOW);
+ digitalWrite(WARNING, LOW);
+ pinMode(LIGHT, OUTPUT);
+ pinMode(RELAY, OUTPUT);
+ pinMode(WARNING, OUTPUT);
+ // put your main code here, to run repeatedly:
+ if (mymillis <= millis())
+ average=average*16.0/17.0;
+ digitalWrite(WARNING, HIGH);
+ digitalWrite(RELAY, LOW);
+ analogWrite(PIN_PWM,255); // only 3v3 intended so this will likely do
+ digitalWrite(WARNING, LOW);
+ analogWrite(PIN_PWM,128); // only 3v3 intended so this will likely do
+ onDelay=0; theState = "standby "; state=0;
+ p(",\"status\":\"%s\"}\r\n", theState); // sadly printf here does not support floats
+ gotoXY(0,0); LcdP("Volts: %d.%d",int(vol),((int(vol*100))%100)/10);
+ gotoXY(0,1); LcdP("S: %s",theState);
+ gotoXY(0,2); LcdP("H:%d.%d L:%d.%d ",int(onVoltage),((int(onVoltage*100))%100)/10,int(offVoltage),((int(offVoltage*100))%100)/10);
+ gotoXY(0,5); LcdP("%05ld:%02d:%02d",hours,mins,secs);
+ digitalWrite(LIGHT, HIGH);
+ digitalWrite(RELAY, LOW);
+ break; // battery is low
+ digitalWrite(RELAY, HIGH);
+ break; // battery is ok
+ break; // intermediate state;
+ mymillis = millis() + lightOnSet;
+ digitalWrite(LIGHT, LOW);
+ mymillis = millis() + lightOffSet;
+ if (++secs==60) { secs=0; if (++mins==60) { mins=0; hours++; } }