# Voltage Division

## Quick Reference

### Voltage Division Calculations

#### Solved for `Vout`

`Vout = Vs * (R2 / R1 + R2)`

#### Solved for Bottom-half of Divider (`R2`

)

`R2 = (R1 * Vout) / (Vs - Vout)`

#### Current at `Vout`

`I = V / R1`

Where `R1`

is the top-half of the divider.

### Netduino Characteristics

#### Analog-to-Digital Convert (ADC) Impedance

The Netduino ADC has an impedance value of approximately `11kΩ`

.

#### 5V to 3.3 Voltage Divider Resistor Values

When level-shifting to a `5V`

voltage domain to a `3.3V`

voltage domain for use with the Netduino ADC, the following resistor values are recommended:

`R1 = 1kΩ`

R2 = 2.2kΩ

## More Info

Voltage division is a complex topic, and covered much more in-depth in part 5 of the electronics tutorial.