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Additional Sensors | ||||||||
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The sensor kit contains 2 sensors with analogue to digital conversion on the sensor chip (DS18b20 and DHT11) while for other analogue signals an additional external ADC is needed. | ||||||||
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< < | The additional sensor boards are all based on the I2C bus and include | |||||||
> > | The additional sensor boards are all based on the I2C bus and include | |||||||
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< < | The Raspberry Pi uses I2C bus 1 for communication with external I2C devices. This can be seen in the /dev directory. Both libraries: wiringpi and pigpio provide access functions to drive the I2C bus. The i2cdetect command allows to see which I2C addresses are in use. The screen dump below shows 2 devices connected to the I2C bus on address 0x3f ( the pcf8574 I/O expander used to driver the hd44780 display driver) and 0x48 (the pcf8591 A/D and D/A chip). | |||||||
> > | The Raspberry Pi uses I2C bus 1 for communication with external I2C devices. This can be seen in the /dev directory. Both libraries: wiringpi and pigpio provide access functions to drive the I2C bus. The i2cdetect command allows to see which I2C addresses are in use. The screen dump below shows 2 devices connected to the I2C bus on address 0x3f ( the pcf8574 I/O expander used to driver the hd44780 display driver) and 0x48 (the pcf8591 A/D and D/A chip). | |||||||