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| + | ====== GCA198, very low speed step motor controller with adjustable speed and functions====== | ||
| + | [[english|{{ rocrail-logo-35.png}}]] | ||
| + | |||
| + | [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#locoio|GCA]] | ||
| + | * [[mgv-overview-en|The GCA Modules]] | ||
| + | |||
| + | |||
| + | {{ :gca:gca198_proto_02.png?150}} | ||
| + | \\ | ||
| + | \\ | ||
| + | \\ | ||
| + | ^^^^By Peter Giling ^^^^ | ||
| + | \\ | ||
| + | |||
| + | ===== Very low speed is sometimes not easy to achieve ===== | ||
| + | Many applications in the modelrailraod require a very slow turning motor.\\ | ||
| + | For that purpose there are a few options but mostly pretty expensive, which\\ | ||
| + | is not the fact with the 28BYJ-48 stepper motor, famous from many applications in Arduino world.\\ | ||
| + | This motor is ususally delivered together with a small driver module.\\ | ||
| + | To control this, an Arduino-nano or higher is used.\\ | ||
| + | This GCA198 board avoids the use of these boards and also supply, because it connects to standard transformer with 8-16V dc output.\\ | ||
| + | Dc supply 10-16V is also possible.\\ | ||
| + | All that is necessary is on-board, like regulator(s) for 5V, the output driver chip, trimmer P1 to control speed and\\ | ||
| + | P2 for setting the interval time.\\ | ||
| + | Addional dip-switches for setting running direction and half/full steps.\\ | ||
| + | It makes a much more compact installation possible.\\ | ||
| + | The motor 28BYJ-48 itself, together with the integral gearbox, is making 4096 steps for one turn.\\ | ||
| + | This will very much restrict a high speed, because of each step should be more than 1200 mSec.,\\ | ||
| + | but for very low speeds , this unit is perfect.\\ | ||
| + | The processor on board is a cheap PIC16F688 with a very simple basic program.\\ | ||
| + | This program is written with the use of PICsimulator IDE from www.oshonsoft.com .\\ | ||
| + | The on board led shows when motor is running.\\ | ||
| + | The trimmers can also been replaced by a 3-pin PSS 254 connector, which then\\ | ||
| + | connects to front mounted potmeters on your switch board.\\ | ||
| + | Other stepper motors van also be used, the best results come with single phase motors (5 wire connection).\\ | ||
| + | The stepper motor has its own power regulator (VR1), so stepper motors with other voltage are also optinal,\\ | ||
| + | just by selecting the right regulator for VR1. \\ | ||
| + | Even supplying the motor without VR1 is possible, as long as the powersupply to the board matches the stepper motor voltage,\\ | ||
| + | But power supply to the board should be minimal 9V dc or 7 V ac.\\ | ||
| + | |||
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| + | \\ | ||
| + | |||
| + | ===== Software ===== | ||
| + | |{{:gca:gca198_firmware.zip|Software sources and .hex file}} | | ||
| + | |||
| + | |||
| + | ===== Hardware files ===== | ||
| + | | {{:gca:gca198_sch.pdf|The diagram }} | | ||
| + | | {{:gca:gca198_pcb.pdf|The pcboard with parts positions}} | | ||
| + | | {{:gca:gca198_parts.pdf|The bill of materials}} | | ||
gca198-en.txt ยท Last modified: 2018/11/12 08:56 (external edit)
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