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The stepper motor control requires two "dual
H-bridge" ICs. As the IC has been used TI SN754410.
Unfortunately at this stage we didn't have connectors for the motors'
plugs. Pieces of wire soldered directly to PCB pretend to be the
headers (see white plugs on the picture). |
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The wiring is hidden underneath. |
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It doesn't look as neat as the surface but it is as the
other side of everything. Don't get upset: this is the world general rule. |
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The white socket (could be smaller, true) is used for the one of the greatest
features of PIC microcontrollers: ISP - In-circuit Serial
Programming. It means that we don't need to remove the
microcontroller from the circuit to reprogram it.
On the left side you can see 7805, 150mA stabilizer. It is used to
power the ICs only. The motors use direct (controlled by H-bridge
ICs) voltage, i.e. 6.8.. 8.3V. |
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Bird-eye view. The quartz crystal could be replaced by
integrated resonator. For sure: we will replace it. It will
significantly decrease the circuit height. |
