Design with mini voltmeter 3 wire 4-100V DC in Cirkit DesignerThe Mini Voltmeter 3 Wire 4-100V DC is a compact and efficient device designed to measure DC voltage within a range of 4 to 100 volts. Its three-wire design ensures easy integration into a variety of electronic circuits, making it a versatile tool for hobbyists, engineers, and technicians. This voltmeter is commonly used in battery monitoring, power supply testing, and other applications where precise voltage measurement is essential.
This circuit consists of a DC power source connected to a mini digital volt/ammeter. The volt/ammeter measures the voltage supplied by the DC power source, with the ground and positive terminals of the power source connected to the corresponding ground and voltage reading pins of the volt/ammeter.
Open Project in Cirkit Designer
This circuit consists of a 9V battery powering a red LED, with a Mini Digital Volt/Ammeter connected to measure the voltage supplied to the LED. The anode of the LED is connected to the positive terminal of the battery through the voltmeter, and the cathode is connected to the negative terminal of the battery through the ground pin of the voltmeter.
Open Project in Cirkit Designer
This circuit is a battery charging and monitoring system for a Li-ion battery using a TP4056 charger module. It includes a digital volt/ammeter to display the battery voltage and current, and features LEDs and a piezo buzzer for status indication. The circuit also incorporates switches for controlling the power and monitoring functions.
Open Project in Cirkit Designer
This circuit appears to be a power supply unit that converts AC voltage to a rectified DC output. It uses a power transformer to step down the AC voltage, which is then rectified by a bridge rectifier composed of four diodes. An electrolytic capacitor is used for smoothing the rectified output, and a mini digital volt/ammeter is included to monitor the voltage and current. The circuit also includes a rocker switch for power control, an AC power plug as the input, and a DC female jack and BNC connectors as outputs.
Open Project in Cirkit DesignerBelow are the key technical details of the Mini Voltmeter 3 Wire 4-100V DC:
| Parameter | Specification |
|---|---|
| Voltage Measurement Range | 4V to 100V DC |
| Operating Voltage | 4V to 30V DC |
| Display Type | 3-digit 7-segment LED display |
| Display Color | Red, Green, or Blue (varies by model) |
| Measurement Accuracy | ±1% |
| Refresh Rate | ~200ms |
| Input Impedance | >100kΩ |
| Operating Temperature | -10°C to +65°C |
| Dimensions | ~48mm x 29mm x 21mm |
| Wire Length | ~15cm |
The Mini Voltmeter has three wires for connection:
| Wire Color | Function | Description |
|---|---|---|
| Red | Positive Power Supply (Vcc) | Connect to a DC voltage source (4-30V) to power the voltmeter. |
| Black | Ground (GND) | Connect to the ground of the power source or circuit. |
| Yellow | Voltage Measurement Input (Vin) | Connect to the positive terminal of the voltage source to be measured (4-100V). |
Note: The red wire powers the voltmeter, while the yellow wire is used for voltage measurement. Ensure the measured voltage (Vin) is within the specified range (4-100V DC).
Power the Voltmeter:
Connect the Voltage Measurement Input:
Verify Connections:
Read the Display:
The Mini Voltmeter can be used alongside an Arduino UNO to monitor voltage in a circuit. Below is an example of how to connect and use the voltmeter:
Here is an Arduino sketch to read and display the voltage on the serial monitor:
// Arduino code to read voltage and display it on the serial monitor
const int voltagePin = A0; // Analog pin connected to the voltage divider
float voltage = 0.0; // Variable to store the measured voltage
void setup() {
Serial.begin(9600); // Initialize serial communication at 9600 baud
}
void loop() {
int sensorValue = analogRead(voltagePin); // Read the analog input
voltage = sensorValue * (5.0 / 1023.0); // Convert to voltage (assuming 5V reference)
// Print the voltage to the serial monitor
Serial.print("Measured Voltage: ");
Serial.print(voltage);
Serial.println(" V");
delay(500); // Wait for 500ms before the next reading
}
Note: If the voltage to be measured exceeds 5V, use a voltage divider circuit to step it down to a safe range for the Arduino's analog input.
No Display on the Voltmeter:
Incorrect Voltage Reading:
Flickering Display:
Voltmeter Overheating:
Q1: Can the Mini Voltmeter measure AC voltage?
A1: No, this voltmeter is designed for DC voltage measurement only. Measuring AC voltage may damage the device.
Q2: Can I power the voltmeter and measure voltage from the same source?
A2: Yes, as long as the source voltage is within the range of 4-30V DC for powering the voltmeter and 4-100V DC for measurement.
Q3: What happens if I reverse the polarity of the wires?
A3: Reversing the polarity may damage the voltmeter. Always double-check the connections before powering the device.
Q4: Can I use this voltmeter in outdoor applications?
A4: The voltmeter is not waterproof or weatherproof. Use it in a dry and controlled environment or enclose it in a protective case for outdoor use.