Contents
How to calculate the voltage of a voltage divider?
The circuit above shows a voltage divider circuit involving a 2kΩ and a 1kΩ resistor. If the voltage from the microcontroller is 5V, then the leveled-down voltage to the sensor is calculated as: V out = 5 ∗ 2kΩ 2kΩ +1kΩ = 3.33V V o u t = 5 ∗ 2 k Ω 2 k Ω + 1 k Ω = 3.33 V
When do you need a voltage divider in a microcontroller?
Another area where voltage dividers are useful is when a voltage needs to be leveled down. The most common scenario is when interfacing signals between a sensor and a microcontroller with two different voltage levels. Most microcontrollers operate at 5V while some sensors can only accept a maximum voltage of 3.3V.
How does a wiper work in a voltage divider?
The wiper cuts the resistor in two and moves it, adjusting the ratio between the top half and the bottom half of the resistor. Connect the two external pins to a voltage (input) and a reference (ground) with the middle (wiper pin) as your output pin and you have yourself a voltage divider.
Which is the output voltage of a circuit?
Take note that the output voltage in actual circuits might be different, since resistor tolerance and load resistance (where the output voltage is connected) become factors. V out V o u t = Output voltage. This is the scaled down voltage. V in V i n = Input voltage.
How to convert 5 V DC to 3.3 V DC using resistors?
The easiest way may be to select R 2 = 10 k Ω and then combine resistors in series and parallel to create [math]R_1 = \\frac {10k\\Omeg [/math] What are you really trying to do here? Those two voltage levels are extremely specific, and especially because you have 3.3V, I suspect you want to use this as a power supply.
What is the voltage of a Vout divider?
The current I is (5 volts – 3.3 volts)/ (200 ohms + 667 ohms) = 1.9608 mA. That current multiplied by R2 (667 ohms) gives you the voltage that Vout is above 3.3 volts i.e. 1.3078 volts hence, Vout = 4.6078 volts.
Which is closest to the ground in a voltage divider?
In the above different voltage divider circuits, the R1 resistor is closest to the input voltage Vin, and the resistor R2 is closest to the ground terminal. The voltage drop across resistor R2 is called Vout which is the divided voltage of the circuit