I2c bus: Difference between revisions
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= Wiring = | = Wiring - Raspberry = | ||
<pre> | <pre> | ||
Color i2cbus Raspberry Pi | Color i2cbus Raspberry Pi | ||
| Line 7: | Line 7: | ||
Black GND GND (Pin 6) | Black GND GND (Pin 6) | ||
</pre> | </pre> | ||
= Software - Raspberry = | |||
Example with both a {{Link|target=SSD1306}} and {{Link|target=PCA9685}} on the bus | |||
<source lang='bash' highlight='1,3,13'> | |||
sudo raspi-config | |||
# enable i2c in Interfacing options | |||
sudo i2cdetect -y 1 | |||
sudo i2cdetect -y 1 | |||
0 1 2 3 4 5 6 7 8 9 a b c d e f | |||
00: -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- | |||
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
70: 70 -- -- -- -- -- -- -- | |||
</source> | |||
= How many devices on the bus? = | = How many devices on the bus? = | ||
https://www.bluedot.space/tutorials/how-many-devices-can-you-connect-on-i2c-bus/ | https://www.bluedot.space/tutorials/how-many-devices-can-you-connect-on-i2c-bus/ | ||
Revision as of 09:17, 7 February 2020
Wiring - Raspberry
Color i2cbus Raspberry Pi yellow SCL GPIO 3 / SCL (Pin 5) orange SDA GPIO 2 / SDA (Pin 3) Red VCC / V 3,3V (pin 1) Black GND GND (Pin 6)
Software - Raspberry
Example with both a SSD1306 and PCA9685 on the bus
sudo raspi-config
# enable i2c in Interfacing options
sudo i2cdetect -y 1
sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: 70 -- -- -- -- -- -- --
How many devices on the bus?
https://www.bluedot.space/tutorials/how-many-devices-can-you-connect-on-i2c-bus/
Pull up resistor calculation
Stackoverflow
Ti.com
Therefore,we can selectany available resistor value between 966.667Ωand 1.77kΩ. The valueof the pull up resistor can be selected basedon the trade-off for the power consumption and speed.