# Battery Measure in Series 8 Lead Acid Voltage

Nov 26th, 2020
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1. //Ratios between voltage dividers
2. // R# = (R1+R2)/R2
3. float R1 = 3.128;
4. float R2 = 6.255;
5. float R3 = 9.383;
6. float R4 = 12.511;
7. float R5 = 15.638;
8. float R6 = 18.766;
9. float R7 = 21.894;
10. float R8 = 25.021;
11.
12. // % Variables
13. int P8 = 0;
14. int P7 = 0;
15. int P6 = 0;
16. int P5 = 0;
17. int P4 = 0;
18. int P3 = 0;
19. int P2 = 0;
20. int P1 = 0;
21.
23.   // Read 1.1V reference against AVcc
24.   // set the reference to Vcc and the measurement to the internal 1.1V reference
25. #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
26.   ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
27. #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
28.   ADMUX = _BV(MUX5) | _BV(MUX0) ;
29. #else
30.   ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
31. #endif
32.
33.   delay(2); // Wait for Vref to settle
36.
38.   uint8_t high = ADCH; // unlocks both
39.
40.   long result = (high << 8) | low;
41.
42.   result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
43.   return result; // Vcc in millivolts
44. }
45.
46. void setup() {
47.   // initialize serial port
48.   Serial.begin(9600);
49. }
50.
51. void loop() {
52.
53.
54.   //Battery Voltage
55.   float B1Voltage = 0;
56.   float B2Voltage = 0;
57.   float B3Voltage = 0;
58.   float B4Voltage = 0;
59.   float B5Voltage = 0;
60.   float B6Voltage = 0;
61.   float B7Voltage = 0;
62.   float B8Voltage = 0;
63.
64.
65.   //converted signal in 5v domain
66.   float RealBat1V = 0;
67.   float RealBat2V = 0;
68.   float RealBat3V = 0;
69.   float RealBat4V = 0;
70.   float RealBat5V = 0;
71.   float RealBat6V = 0;
72.   float RealBat7V = 0;
73.   float RealBat8V = 0;
74.
75.
76.   //Analog channel raw value
77.   float VolBat1 = 0;
78.   float VolBat2 = 0;
79.   float VolBat3 = 0;
80.   float VolBat4 = 0;
81.   float VolBat5 = 0;
82.   float VolBat6 = 0;
83.   float VolBat7 = 0;
84.   float VolBat8 = 0;
85.
86.   float vccValue = readVcc() / 1000.0; //Arduino refence voltage
87.
88.
98.
99.
100.   //Converting raw value in 5v domian
101.   RealBat1V = VolBat1 * vccValue / 1024.0;
102.   RealBat2V = VolBat2 * vccValue / 1024.0;
103.   RealBat3V = VolBat3 * vccValue / 1024.0;
104.   RealBat4V = VolBat4 * vccValue / 1024.0;
105.   RealBat5V = VolBat5 * vccValue / 1024.0;
106.   RealBat6V = VolBat6 * vccValue / 1024.0;
107.   RealBat7V = VolBat7 * vccValue / 1024.0;
108.   RealBat8V = VolBat8 * vccValue / 1024.0;
109.
110.
111.   //Calculating actual voltages
112.   B8Voltage = RealBat4V * R8;
113.   B7Voltage = RealBat3V * R7 - B8Voltage;
114.   B6Voltage = RealBat2V * R6 - B8Voltage - B7Voltage;
115.   B5Voltage = RealBat1V * R5 - B8Voltage - B7Voltage - B6Voltage;
116.   B4Voltage = RealBat4V * R4 - B8Voltage - B7Voltage - B6Voltage - B5Voltage;
117.   B3Voltage = RealBat3V * R3 - B8Voltage - B7Voltage - B6Voltage - B5Voltage - B4Voltage;
118.   B2Voltage = RealBat2V * R2 - B8Voltage - B7Voltage - B6Voltage - B5Voltage - B4Voltage - B3Voltage;
119.   B1Voltage = RealBat1V * R1 - B8Voltage - B7Voltage - B6Voltage - B5Voltage - B4Voltage - B3Voltage - B2Voltage;
120.
121.
122.   //Convert to %
123.   // map(value, fromLow, fromHigh, toLow, toHigh)
124.   P8 = map(B8Voltage, 0, 12, 0, 100);
125.   P7 = map(B7Voltage, 0, 12, 0, 100);
126.   P6 = map(B6Voltage, 0, 12, 0, 100);
127.   P5 = map(B5Voltage, 0, 12, 0, 100);
128.   P4 = map(B4Voltage, 0, 12, 0, 100);
129.   P3 = map(B3Voltage, 0, 12, 0, 100);
130.   P2 = map(B2Voltage, 0, 12, 0, 100);
131.   P1 = map(B1Voltage, 0, 12, 0, 100);
132.
133.
134.   //Print voltages on serial monitor
135.   Serial.print("Battery-1 Voltage=");
136.   Serial.println(B1Voltage);
137.   Serial.print("Battery-2 Voltage=");
138.   Serial.println(B2Voltage);
139.   Serial.print("Battery-3 Voltage=");
140.   Serial.println(B3Voltage);
141.   Serial.print("Battery-4 Voltage=");
142.   Serial.println(B4Voltage);
143.   Serial.print("Battery-5 Voltage=");
144.   Serial.println(B5Voltage);
145.   Serial.print("Battery-6 Voltage=");
146.   Serial.println(B6Voltage);
147.   Serial.print("Battery-7 Voltage=");
148.   Serial.println(B7Voltage);
149.   Serial.print("Battery-8 Voltage=");
150.   Serial.println(B8Voltage);
151.
152.   delay(2000); //2 Seconds delay and then start again
153. }
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