Challenge: Design a Sensor Interface
When connecting a sensor to a microcontroller, you often need to adjust voltage levels for compatibility and safety. A common approach is to use a voltage divider, which consists of two resistors (R1 and R2) in series. The output voltage (Vout) is taken across R2, and is given by the formula:
Vout = Vin * (R2 / (R1 + R2))
Here, Vin is the input voltage from the sensor, and you want Vout to match the microcontroller's maximum input voltage. Selecting resistor values that are both practical and available is crucial. The E12 series (values like 1.0kΩ, 1.2kΩ, 1.5kΩ, etc.) is a standard set of resistor values commonly found in electronics. Using standard values ensures your circuit can be built with off-the-shelf components, reducing cost and complexity.
In this challenge, you will design a voltage divider to safely connect a 5V sensor output to a 3.3V microcontroller input. You will calculate resistor values, verify if they are standard E12 values, and adjust if necessary to achieve the closest possible output voltage.
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Design a Python script to calculate resistor values for a voltage divider that reduces a 5V sensor output to 3.3V for a microcontroller input.
- Use the voltage divider formula to determine the ideal values for
R1andR2to achieve a 3.3V output from a 5V input. - Check if the calculated resistor values are standard E12 series values.
- If not, select the closest E12 standard values for
R1andR2. - Calculate the actual output voltage using the chosen standard resistor values.
- Return the selected
R1,R2, and the resulting output voltage.
Solução
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How do I calculate the resistor values for this voltage divider?
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When connecting a sensor to a microcontroller, you often need to adjust voltage levels for compatibility and safety. A common approach is to use a voltage divider, which consists of two resistors (R1 and R2) in series. The output voltage (Vout) is taken across R2, and is given by the formula:
Vout = Vin * (R2 / (R1 + R2))
Here, Vin is the input voltage from the sensor, and you want Vout to match the microcontroller's maximum input voltage. Selecting resistor values that are both practical and available is crucial. The E12 series (values like 1.0kΩ, 1.2kΩ, 1.5kΩ, etc.) is a standard set of resistor values commonly found in electronics. Using standard values ensures your circuit can be built with off-the-shelf components, reducing cost and complexity.
In this challenge, you will design a voltage divider to safely connect a 5V sensor output to a 3.3V microcontroller input. You will calculate resistor values, verify if they are standard E12 values, and adjust if necessary to achieve the closest possible output voltage.
Swipe to start coding
Design a Python script to calculate resistor values for a voltage divider that reduces a 5V sensor output to 3.3V for a microcontroller input.
- Use the voltage divider formula to determine the ideal values for
R1andR2to achieve a 3.3V output from a 5V input. - Check if the calculated resistor values are standard E12 series values.
- If not, select the closest E12 standard values for
R1andR2. - Calculate the actual output voltage using the chosen standard resistor values.
- Return the selected
R1,R2, and the resulting output voltage.
Solução
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