This FeatherWing was designed to monitor HVAC system parameters. It can measure airflow, humidity, and temperature, and it has terminal block connections that can be used for analog inputs or as outputs. The data can be displayed on an integrated e-ink display. We have built and tested units, and they are working well. Files and code to follow.
This is the Feather I created to run the Feather M4 Express version of my 3D Printed TurtlePlotBot. The Feather has a MCP23008 i2c 8 bit port expander connected to a ULN2803A darlington transistor array to drive a pair of 28byj-48 unipolar stepper motors. This allows me to use i2c and 1 other pin to run the TurtlePlotBot using Turtle Graphics commands in CircuitPython.
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