Introduction¶
CircuitPython driver for EMC2101 brushless fan controller
Dependencies¶
This driver depends on:
Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.
Installing from PyPI¶
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:
pip3 install adafruit-circuitpython-emc2101
To install system-wide (this may be required in some cases):
sudo pip3 install adafruit-circuitpython-emc2101
To install in a virtual environment in your current project:
mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-emc2101
Usage Example¶
import time
import board
from adafruit_emc2101 import EMC2101
i2c = board.I2C() # uses board.SCL and board.SDA
emc = EMC2101(i2c)
print("Setting fan speed to 25%")
emc.manual_fan_speed = 25
time.sleep(2) # longer sleep to let it spin down from 100%
print("Fan speed", emc.fan_speed)
Additional examples, including the use of the temperature look up table (LUT) can be found in the examples/ folder:
emc2101_lut_example.py
emc2101_set_pwm_freq.py
emc2101_simpletest.py
For access to some additional properties, but without configuring the LUT, use the intermediate class EMC2101_EXT:
import time
import board
from adafruit_emc2101 import EMC2101_EXT
i2c = board.I2C() # uses board.SCL and board.SDA
emc = EMC2101_EXT(i2c)
print("External limit temp is", emc.external_temp_high_limit)
print("Setting external limit temp to 50C")
emc.external_temp_high_limit = 50
When the temperature limits are exceeded the device sets the alert bit in the status register and (if configured to do so) will raise the ALERT output pin as an interrupt.
EMC2101_EXT defines properties for internal and external temperature limits, and has register definitions for all registers except the LUT itself. The EMC2101_LUT class includes this as well.
The EMC2101_Regs class is intended for internal use, and defines register addresses.
Documentation¶
API documentation for this library can be found on Read the Docs.
For information on building library documentation, please check out this guide.
Contributing¶
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
Table of Contents¶
Examples
API Reference
adafruit_emc2101
EMC2101
EMC2101.conversion_rate
EMC2101.dac_output_enabled
EMC2101.devconfig
EMC2101.devstatus
EMC2101.external_temperature
EMC2101.fan_speed
EMC2101.forced_ext_temp
EMC2101.forced_temp_enabled
EMC2101.initialize()
EMC2101.internal_temperature
EMC2101.invert_fan_output
EMC2101.lut_enabled
EMC2101.manual_fan_speed
EMC2101.part_info
EMC2101.spinup_drive
EMC2101.spinup_time
EMC2101.tach_limit
adafruit_emc2101.emc2101_regs
adafruit_emc2101.emc2101_lut
EMC2101_LUT
adafruit_emc2101.emc2101_fanspeed
FanSpeedLUT
adafruit_emc2101.emc2101_ext
EMC2101_EXT
EMC2101_EXT.auto_check_status
EMC2101_EXT.check_status()
EMC2101_EXT.dev_temp_critical_hysteresis
EMC2101_EXT.dev_temp_critical_limit
EMC2101_EXT.dev_temp_high_limit
EMC2101_EXT.devstatus
EMC2101_EXT.external_temp_high_limit
EMC2101_EXT.external_temp_low_limit
EMC2101_EXT.external_temperature
EMC2101_EXT.fan_speed
EMC2101_EXT.initialize()
EMC2101_EXT.internal_temperature
EMC2101_EXT.last_status
adafruit_emc2101.emc2101_enums
CV
ConversionRate
SpinupDrive
SpinupTime
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