Instrument control package: Difference between revisions
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→i2c
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In the example case the temperature sensor is connected to the i2c-ch341-usb device, | In the example case the temperature sensor is connected to the i2c-ch341-usb device, and it is assumed the user has sufficient permissions to access the device. | ||
According to the datasheet, the temperature device uses address 0x40, so create a i2c device using the linux device and address: | According to the datasheet, the temperature device uses address 0x40, so create a i2c device using the linux device and address: | ||
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To read the | To read the temperature, register 0xF3 must be addressed and read (2 bytes of data): | ||
<syntaxhighlight lang="octave" style="font-size:13px"> | <syntaxhighlight lang="octave" style="font-size:13px"> | ||
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data = fread (i2cdev, 3); | data = fread (i2cdev, 3); | ||
</syntaxhighlight> | </syntaxhighlight> | ||
The data must be converted to a deg K value by making 16 bit number of the value and masking out unused bits. | |||
<syntaxhighlight lang="octave" style="font-size:13px"> | <syntaxhighlight lang="octave" style="font-size:13px"> | ||