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DIY 4 Channel DC Digital Voltmeter
This is 4 channel DC digital voltmeter. In normal multimeter you can check one volt at a time but in this voltmeter you can check four different volt at a time. Also design cashing with PVC pipe for professional looking. This is very easy to make, just follow all the step in the video and make your own 4 channel voltmeter.
Components:
1) Banana Jack Plug Connector & Socket 4mm Male +Female : https://roboman.in/kmrk
2) LCD2004 Parallel LCD Display : https://roboman.in/19uy
3) TP-4056 Module : https://roboman.in/oa0m
4) Arduino Nano: https://roboman.in/59h4
5) Arduino Nano Type C : https://roboman.in/xkfu
6) MT-3608 Boost module : https://roboman.in/xdcw
7) 100K resistor: https://roboman.in/9h3u
8) 10K resistor: https://roboman.in/e3xw
9) SPST Switch : https://roboman.in/74he
10) 18650 Lithium Battery 2500mah 3C :https://roboman.in/utwc
10) 18650 Lithium Battery 2600mah 3C :https://roboman.in/mmab
10) 18650 Lithium Battery 2200mah 1C :https://roboman.in/70b5
10) 18650 Lithium Battery 2000mah 1C :https://roboman.in/7em9
10) 18650 Lithium Battery 1800mah 1C :https://roboman.in/ywss
Diagram :
Code :
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#include "Wire.h" #include "LiquidCrystal_I2C.h" // library for I@C interface LiquidCrystal_I2C lcd(0x27, 20, 4); int analogInput = A0; int analogInput1 = A1; int analogInput2 = A2; int analogInput3 = A3; float Vout = 0.00; float Vout1 = 0.00; float Vout2 = 0.00; float Vout3 = 0.00; float Vin,Vin1,Vin2,Vin3 = 0.00; float R1 = 99500.00; // resistance of R1 (100K) float R2 = 10000.00; // resistance of R2 (10K) float R3 = 98200.00; // resistance of R1 (100K) float R4 = 10000.00; // resistance of R2 (10K) float R5 = 98100.00; // resistance of R1 (100K) float R6 = 10000.00; // resistance of R2 (10K) float R7 = 100500.00; // resistance of R1 (100K) float R8 = 10000.00; // resistance of R2 (10K) int val,val1,val2,val3 = 0; void setup(){ lcd.begin(20, 4); lcd.backlight(); pinMode(analogInput, INPUT); //assigning the input port pinMode(analogInput1, INPUT); //assigning the input port pinMode(analogInput2, INPUT); //assigning the input port pinMode(analogInput3, INPUT); //assigning the input port Serial.begin(9600); //BaudRate lcd.setCursor(2,0); lcd.print("4 CHANNEL DIGITAL "); lcd.setCursor(6,1); lcd.print("VOLTMETER"); lcd.setCursor(6,3); lcd.print("LOADING...."); delay(5000); lcd.clear(); } void loop(){ lcd.clear(); val = analogRead(analogInput);//reads the analog input Vout = (val * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00 Vin = Vout / (R2/(R1+R2)); // formula for calculating voltage in i.e. GND val1 = analogRead(analogInput1);//reads the analog input Vout1 = (val1 * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00 Vin1 = Vout1 / (R4/(R3+R4)); // formula for calculating voltage in i.e. GND val2 = analogRead(analogInput2);//reads the analog input Vout2 = (val2 * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00 Vin2 = Vout2 / (R6/(R5+R6)); // formula for calculating voltage in i.e. GND val3 = analogRead(analogInput3);//reads the analog input Vout3 = (val3 * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00 Vin3 = Vout3 / (R8/(R7+R8)); // formula for calculating voltage in i.e. GND if (Vin<0.09)//condition { Vin=0.00;//statement to quash undesired reading ! } if (Vin1<0.09)//condition { Vin1=0.00;//statement to quash undesired reading ! } if (Vin2<0.09)//condition { Vin2=0.00;//statement to quash undesired reading ! } if (Vin3<0.09)//condition { Vin3=0.00;//statement to quash undesired reading ! } Serial.print("\t Voltage of the given source = "); lcd.setCursor(0,0); lcd.print("VOLTMETER 1 "); Serial.println(Vin); lcd.print(Vin); lcd.print("V"); Serial.print("\t Voltage of the given source 2 = "); lcd.setCursor(0,1); lcd.print("VOLTMETER 2 "); Serial.println(Vin1); lcd.print(Vin1); lcd.print("V"); lcd.setCursor(0,2); lcd.print("VOLTMETER 3 "); Serial.println(Vin2); lcd.print(Vin2); lcd.print("V"); lcd.setCursor(0,3); lcd.print("VOLTMETER 4 "); Serial.println(Vin3); lcd.print(Vin3); lcd.print("V"); delay(1000); //for maintaining the speed of the output in serial moniter } |
