The Raspberry Pi GPIO pins include pull-up resistors. When a GPIO pin is being used as a digital input, its pull-up resistor will keep the input high (3.3V) until the input is pulled down to GND, perhaps by a switch. The designer of a system needs to run a long lead to the switch from the microcontroller and found the internal pull-up resistors (40kohms) weak. Calculate the needed resistance of external pull ups as an alternative. Assume you can turn off the internal pull-up and pull-down resistors and external pull-up resistor in this case. Also show your circuit design.
The Raspberry Pi GPIO pins include pull-up resistors. When a GPIO pin is being used as a digital input, its pull-up resistor will keep the input high (3.3V) until the input is pulled down to GND, perhaps by a switch. The designer of a system needs to run a long lead to the switch from the microcontroller and found the internal pull-up resistors (40kohms) weak. Calculate the needed resistance of external pull ups as an alternative. Assume you can turn off the internal pull-up and pull-down resistors and external pull-up resistor in this case. Also show your circuit design.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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The Raspberry Pi GPIO pins include pull-up resistors. When a GPIO pin is being used as a digital input, its pull-up resistor will keep the input high (3.3V) until the input is pulled down to GND, perhaps by a switch. The designer of a system needs to run a long lead to the switch from the microcontroller and found the internal pull-up resistors (40kohms) weak. Calculate the needed resistance of external pull ups as an alternative. Assume you can turn off the internal pull-up and pull-down resistors and external pull-up resistor in this case. Also show your circuit design.
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