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+====== GCA202  Stepmotor controller for 28BY J-48 motor. ======
+{{  :gca:gca202_pcb_pict_01.jpg?200}}{{  :gca:stepmotor_2sby.jpg?200}}
+[[english|{{  rocrail-logo-35.png}}]]
+[[:english|Content]] -> [[:hardware-en|Hardware]] -> [[:hardware-en#interfaces|GCA]]
+ \\
+^^^^By Peter Giling ^^^^
+\\
+===== A very nice universal stepmotor =====
+The widely available 28BY J-48 stepmotor is fantastic for all kinds of movements, \\
+you surely like to have on your model railroad.\\
+Mostly, this motor is controlled with an Arduino board, but to achieve exactly what you desire,\\
+a certain skill in programming is needed.\\
+And besides that, using an Arduino wiil usually result in 2 or 3 different boards, connected together with wires.\\
+It can be much more convenient with GCA202.\\
+In this design, all is placed on one board, and it can be connected as interface with GCA50(0), GCA185, CAN-GC2 and GCA_PI02.\\
+This implies also, that the motor can be switched on and off in Rocrail, i.e. using actions.\\
+===== Features =====
+  *  Motor controlled in forward or reverse.
+  *  Speed adjustable from approx 0,4 RPM to 16 RPM.
+  *  Selectable 5 V power input between external and internal(from LocoNet, CBUS or RocNet modules).
+  *  On-board optocoupler, to separate external 5V power from train network.
+  *  Position feed-back for further automation control.
+  *  Only useable for 5V unipolar stepmotors.
+===== Hardware =====
+Two inputs (via Optio-couplers) are used for commanding forward or reverse rotation.\\
+For future expansion, two feed-back outputs (also with Opto-coupler isolation) are implemented.\\
+|  {{:gca:gca202_pcb_pict_03.jpg?450}}  |  {{:gca:gca202_pcb_pict_02.jpg?500}}  |
+|  The standard high quality pc-board  |  .. and complex but small  \\  (30x69 mm) unit as a result.  |
+\\
+|  {{:gca:gca202_sch.pdf|Schematic drawing}}  |
+|  {{:gca202_pcb_gerber.zip|PCB drawing in gerber files}}  |
+|  {{:gca202_pcb.pdf|The pc-board and parts positions}}  |
+|  {{:gca:gca202_parts.pdf|The bill of materials}}  |
+\\
+===== Firmware =====
+Firmware is created with PicSimulator IDE from www.oshonsoft.com.\\
+|  {{:gca:firmware:gca202_firmware.zip}}  |
+===== Connections =====
+===   Power  ===
+The unit needs 5V dc for power approx 200 mA maximum,\\
+== 2 popssible ways of feeding in power :==
+) Connect it to connector V5 (+ / -  are indicated on board).\\
+-  In this case two jumpers should be placed in position closest to V5.\\
+) Supply from CAN-GC2, GCA50(0), GCA185, or GCA_PI02.\\
+-  Connect 10 Pin PSK connector from CAN-GC2 etc,  to J2,\\
+-  J1 can be used to connect next interface board like GCA173,GCA93, GCA77,  etc.\\
+-  Of this next board, only port 5 - 8 will pass through.\\
+-  Place jumpers closest to Diode D1.\\
+-  Due to the needed current, it is advisable to only connect 1 x GCA202 to CAN-GC2 etc.\\
+-  There is option for more, in that case ask [[peter.giling@rocrail.net| Peter]].\\
+\\
+===  Command control  ===
+If no commmand control is needed, it is best to remove Optocoupler, and connect \\
+pin 15 and 16 together for clockwise rotation OR Pin 14 and 15 for counterclockwise rotation.\\
+If external command control is desired: >  Port 1 starts clockwise- and Port 2 starts counterclockwise rotation (0=V = OFF, 5V = ON.\\
+===== Speed setting =====
+P1 is used to set the rotation speed.\\
+Turn left for slower, turn right for faster rotation.\\
+Minimum speed is 0.4 RPM.\\
+The maximum speed of ca 16 RPM is defined by the motor itself.\\
+===== Feed-back =====
+Port 3 & 4 are used for feed-back the functions.\\
+In simple setup not needed, but very useful if this unit is used in automated setups.\\
+Example:\\
+You have a railroad bridge that is opened every now and then, either manual or automatic.\\
+In that case you will need feed-back to check if the bridge is down and ready for passing the train again.\\
+Here you just use a microswitch in the bridge, which disables the signal to GCA202.\\
+The feed-back (port 3 = fwd, port 4 = rev) will shut off when switch contacts are opened.\\
+**Attention:**\\
+Depending on the type of used communication system, there might be a delay before the feed-back is responding at the start of the motor.\\
+If that is the case , be sure to make some kind of delay in the controlling program, before the feed-back is checked.\\
+===== Led function. =====
+When motor is in stop mode, led will lit normally.\\
+When motor is activated, led wil flash according motor speed.\\
+But with high speed it will flash with approx 130Hz, so not visible.\\
+===== Nice item for futher development =====
+This page shows how simple a stepmotor driver can be.\\
+The standard firmware as given on this page, is probably only a start.\\
+Firmware can easily be altered to create a stepmotor that makes a predefined amount of steps.\\
+Even two different amount of steps in same direction,\\
+Also here, the feed-back signals can be used to inform Rocrail that motor 'has finished its task'. \\
+What ever is desired.... plenty of options!  \\
+Let me show your creation with this board in these pages !\\