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boards:megapi [2023/10/06 15:39] – [Pinout] darronboards:megapi [2023/10/11 17:13] (current) – darron
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 </wrap> </wrap>
  
-This board can connect directly to a Raspberry Pi or work +This board contains an ATmega2560 and is compatible with [[:boards:mega2560|Arduino]]. 
-standalone.+ 
 +It can connect directly to a Raspberry Pi or work standalone.
  
 Power applied to the DC input jack may be between 6V and Power applied to the DC input jack may be between 6V and
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 NB Disable system login console on Pi to enable AVR UART2 comms. NB Disable system login console on Pi to enable AVR UART2 comms.
  
-== Motors ==+== Motor I/O ==
  
 __GPIO__ __GPIO__
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 </code> </code>
  
-__NEMA17__+=== Motor wiring ===
  
-Left to right (socket down)+__NEMA__ 
 + 
 +Left to right (socket pointing upward) 
 + 
 +This may actually be reversed or just wrong.
  
 <code> <code>
-1 PHASE 2 START   GREEN/WHITE   A++1 PHASE 2 START   GREEN/WHITE   B+   B2
 2 2
-3 PHASE 2 FINISH  GREEN         A- +3 PHASE 2 FINISH  GREEN         B-   B1 
-4 PHASE 1 FINISH  RED/WHITE     B-+4 PHASE 1 FINISH  RED/WHITE     A-   A1
 5 5
-6 PHASE 1 START   RED           B++6 PHASE 1 START   RED           A+   A2
 </code> </code>
 +
 +__MOTOR__
 +
 +A `generic' cable from eBay (these vary)
 +
 +<code>
 +A+ RED
 +A- GREEN
 +B- BLUE
 +B+ BLACK
 +</code>
 +
 +My generic cable has the two centre pins twisted.
  
 __PORT__ __PORT__
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 B+ B- A- A+ B+ B- A- A+
 </code> </code>
 +
 +Wiring as per above will result in correct shaft direction. Reverse wiring or swap one pair of wires to rectify incorrect direction.
 ===Resources=== ===Resources===
  
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 [[https://www.ti.com/lit/ds/symlink/drv8825.pdf|TI DRV8825 data-sheet]] [[https://www.ti.com/lit/ds/symlink/drv8825.pdf|TI DRV8825 data-sheet]]
 +
 +[[http://www.ti.com/lit/an/slyt482/slyt482.pdf|Acceleraton and deceleration profiles for stepper motors]]
  
 [[https://iopscience.iop.org/article/10.1088/1757-899X/294/1/012055/pdf|Stepper motor profile in real-time]] [[https://iopscience.iop.org/article/10.1088/1757-899X/294/1/012055/pdf|Stepper motor profile in real-time]]