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Added more info to i2c pins and overlay

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Phil Howard 2015-11-14 00:55:47 +00:00
parent 5c7963b2d3
commit f994dbec5d
3 changed files with 7 additions and 6 deletions
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2
src/en/overlay/i2c.md
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@ -26,6 +26,8 @@ pin:
The Raspberry Pi's I2C pins are an extremely useful way to talk to many different types of external peripheral; from the MCP23017 digital IO expander, to a connected ATmega.
The i2c pins include a fixed 1.8k pull-up resistor to 3.3v. This means they are not suitable for use as general purpose IO where a pull-up is not required.
You can verify the address of connected I2C peripherals with a simple one-liner:
```bash

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src/en/pin/pin-3.md
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SDA is one of the i2c pins on the Pi, [learn more about i2c](/pinout/i2c).
SDA (i2c Data) is one of the i2c pins on the Pi, [learn more about i2c](/pinout/i2c).
It's easy to get started writing a digital HIGH or LOW to a GPIO pin, but you've got to remember a few things:
* Run your script as root
* Set your pin's mode to OUTPUT (1)
SDA includes a fixed, 1.8k pull-up to 3.3v, which means this pin is not suitable for use as a general purpose IO where no pullup resistor is desired.

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src/en/pin/pin-5.md
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@ -1 +1,3 @@
SCL is one of the i2c pins on the Pi, [learn more about i2c](/pinout/i2c).
SCL (i2c Clock) is one of the i2c pins on the Pi, [learn more about i2c](/pinout/i2c).
SCL includes a fixed, 1.8k pull-up to 3.3v, which means this pin is not suitable for use as a general purpose IO where no pullup resistor is desired.