MCP23017 + Stepper Driver

[nicolasdb]

ULN2003 Stepper Motor Driver need 4 pins, this could rapidely be limiting on the M5stampC3

How to use the MCP23017 to connect the driver?
ESP8266 running 12 stepper motors
https://www.youtube.com/watch?v=Hg9MEVxCPA8

libs to explore:

1. http://www.airspayce.com/mikem/arduino/AccelStepper/
2. https://github.com/johannilsson/MCP3017AccelStepper/
3. https://github.com/harelabb/SerialStepper

https://lastminuteengineers.com/a4988-stepper-motor-driver-arduino-tutorial/

[nicolasdb]

I guess there is a problem between librairies

Compiling .pio/build/ESP32-C3U/src/main.cpp.o
src/main.cpp: In function 'void setup()':
src/main.cpp:30:3: error: 'mcp' was not declared in this scope
   mcp.begin_I2C();
   ^~~
src/main.cpp:30:3: note: suggested alternative: 'mcp1'
   mcp.begin_I2C();
   ^~~
   mcp1
src/main.cpp:34:28: error: no matching function for call to 'MCP3017AccelStepper::setMcp(Adafruit_MCP23X17&)'
     steppers[i].setMcp(mcp1);

[nicolasdb]

without MCP
https://www.makerguides.com/28byj-48-stepper-motor-arduino-tutorial

https://arduinogetstarted.com/tutorials/arduino-controls-28byj-48-stepper-motor-using-uln2003-driver

[nicolasdb]

https://elabz.com/manually-controlling-bipolar-stepper-motor-with-arduino-and-easydriver/

[nicolasdb]

bakc to basics, because I fail to understand how to use libs to do a simple thing like
"While push button 1, run stepper ++ else stop.
While push button 2, run stepper - - else stop."

My setup is a simple quick&dirty linear motion.

1. the stepper is hot. I should check the current limit.
   

[nicolasdb]

[nicolasdb]

Homing stepper

https://www.brainy-bits.com/post/homing-stepper-motors-using-the-accelstepper-library