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R1 is the top resistor (from Vin), R2 is the bottom one (to GND)
A voltage divider circuit is a circuit that takes a higher voltage and converts it into a lower one by using a pair of resistors connected in series.
The formula for calculating the output voltage is based on Ohm’s Law and is shown below.
Where:
Enter any three known values and press Calculate to solve for the other. Voltage divider circuits are commonly used in robotics, signal conditioning, and microcontroller platforms like Arduino and ESP32.
When selecting R1 and R2 in a voltage divider circuit, first decide the required Vout and know your source voltage (Vs).
For Arduino and sensor circuits, values between 1kΩ to 100kΩ are commonly used.
Suppose:
Using the voltage divider formula:
Vout = 12 × (2 / (4 + 2)) Vout = 12 × (2 / 6) Vout = 12 × 0.333 Vout = 4V
So, the output voltage is 4 volts.
Voltage divider circuits are widely used in Arduino projects, sensor signal scaling, battery voltage monitoring, analog input protection, PCB design, and electronics labs. They help step down voltage safely, making them essential for students, teachers, and DIY electronics enthusiasts.
Voltage dividers can be used to reduce voltage levels for digital inputs, but they are best suited for **high impedance** circuits. When the load draws significant current, the divider’s output can shift. For digital logic, it’s often better to use a dedicated level shifter or buffer to maintain stable voltages.
Yes. Very high resistor values can lead to noise and measurement inaccuracies due to stray capacitance and input leakage currents. Very low resistor values draw more current, increasing power consumption. Choosing moderate values (e.g., 1 kΩ–100 kΩ) usually balances accuracy and efficiency.
Adding a load changes the effective output voltage because the load resistance parallels one of the resistor values. This changes the ratio and can lead to incorrect voltage at the output. To avoid this, use a buffer amplifier or design the divider with much smaller resistance than the load.
Voltage dividers are great for voltage **sensing**, but they are not ideal for powering devices because they are not designed to supply significant current. A linear regulator or DC-DC converter is better suited for supplying stable power.
Temperature affects resistor values due to their temperature coefficients. If your application operates over varying temperatures, consider using precision resistors with low temperature coefficients to maintain stable output voltages.
Enter resistor values in ohms (Ω). If your resistor values are given in kiloohms (kΩ) or megaohms (MΩ), convert them to ohms first (e.g., 10 kΩ = 10 000 Ω) to ensure accurate results.
Voltage dividers work by creating a ratio of resistances, not by regulating current. High current loads will significantly alter the output voltage and can cause excessive power dissipation in the resistors. For high current applications, use a dedicated regulator instead.
A balance is needed: higher resistance values reduce current draw and power loss but increase susceptibility to noise. Lower resistance values reduce noise impact but increase power consumption. Aim for moderate resistor values that meet your application’s accuracy and efficiency requirements.