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— | gca202-en [2018/11/26 02:23] (current) – created - external edit 127.0.0.1 | ||
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+ | ====== GCA202 | ||
+ | {{ : | ||
+ | [[english|{{ | ||
+ | [[: | ||
+ | |||
+ | \\ | ||
+ | ^^^^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, | ||
+ | * 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.\\ | ||
+ | |||
+ | | {{: | ||
+ | | The standard high quality pc-board | ||
+ | \\ | ||
+ | | {{: | ||
+ | | {{: | ||
+ | | {{: | ||
+ | | {{: | ||
+ | \\ | ||
+ | |||
+ | ===== Firmware ===== | ||
+ | Firmware is created with PicSimulator IDE from www.oshonsoft.com.\\ | ||
+ | | {{: | ||
+ | |||
+ | ===== Connections ===== | ||
+ | === | ||
+ | |||
+ | The unit needs 5V dc for power approx 200 mA maximum,\\ | ||
+ | == 2 popssible ways of feeding in power :== | ||
+ | 1) Connect it to connector V5 (+ / - are indicated on board).\\ | ||
+ | - In this case two jumpers should be placed in position closest to V5.\\ | ||
+ | 2) 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, | ||
+ | - 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, | ||
+ | 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 !\\ | ||
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gca202-en.txt · Last modified: 2018/11/26 02:23 by 127.0.0.1