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Connect Raspberry Pi GPIO input with 5 or 12 volts

Last Updated on May 31, 2020 by Kalitut Leave a Comment

Raspberry Pi Connect GPIO input with 5 or 12 volts

Connect Raspberry Pi GPIO input

The input and output level of a GPIO of Raspberry Pi for “High” is at a voltage of 3.3 volts. But if you have a larger input level then you can not apply this voltage directly to a GPIO. The GPIO would be overloaded and broken.

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Filed Under: Raspberry Pi Tagged With: Raspberry Pi GPIO

Raspberry Pi GPIO input wired with button/switch

Last Updated on May 31, 2020 by Kalitut Leave a Comment

Raspberry Pi GPIO input wired with button

Raspberry Pi GPIO input

Basically, you can operate a GPIO pin either as an input or as an output. As an input, it can assume the states “High” and “Low”. For example, from a switch or button. 
In general, Raspberry Pi’s GPIOs are wired with resistors to set inputs to a defined level (+ VCC or GND) or to limit the current.

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Filed Under: Raspberry Pi Tagged With: Raspberry Pi GPIO

Control Raspberry Pi GPIO with sysfs

Last Updated on July 19, 2020 by Kalitut 1 Comment

Control and program Raspberry Pi GPIO with “sysfs” (shell/bash)

raspberry pi gpio sysfs

The GPIOs are represented on Raspberry Pi as files and can be found in the directory tree under “/ sys / class / gpio”. This is called “sysfs”. If you look at the contents of the files, you get the state out. This is either “1” or “0”.

[Read more…] about Control Raspberry Pi GPIO with sysfs

Filed Under: Raspberry Pi Tagged With: Raspberry Pi GPIO

Configure Raspberry Pi GPIO at system startup

Last Updated on May 31, 2020 by Kalitut 3 Comments

Raspberry Pi configure GPIO at system startup

Configure Raspberry Pi GPIO

Before you can use a GPIO as input or output, it must be configured or set. Unfortunately,  Raspberry Pi does not remember this setting. Therefore, the setting must be executed again each time the system is restarted.

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Filed Under: Raspberry Pi Tagged With: Raspberry Pi GPIO

Measurement of voltage and current at the GPIO output with high level under load

Last Updated on May 30, 2020 by Kalitut Leave a Comment

Raspberry Pi Measurement of voltage and current at the GPIO output with high level under load

GPIO output with high level under load

If you connect a high-level GPIO output to a Raspberry Pi, then you expect a voltage of 3.3 volts. Unfortunately, a GPIO output changes its voltage and current behavior under load.

[Read more…] about Measurement of voltage and current at the GPIO output with high level under load

Filed Under: Raspberry Pi Tagged With: Raspberry Pi GPIO

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