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ELM410SM Datasheet(PDF) 4 Page - ELM Electronics |
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ELM410SM Datasheet(HTML) 4 Page - ELM Electronics |
4 / 4 page Example Application 4 of 4 Figure 1. Manual Control of a Stepper Motor Figure 1 shows the ELM410 used to interface two momentary action normally open pushbutton switches to an ELM310 in a manually controlled stepping motor circuit. For simplicity, the stepper motor and its drive transistors are not shown on this diagram. Using the ELM310 to control a stepper motor has many advantages - low cost, low power, ease of use, etc. There is one disavantage however, in that the integrated circuit is capable of responding quite quickly to inputs. This would result in multiple steps of the motor, and perceived erratic operation, if the input were connected directly to a switch, and not debounced by a circuit such as the ELM410. The circuit below shows how easily two control switches can be debounced and used to control the ELM310. The two switches are simply connected between VSS and their respective inputs, allowing the internal pullup resistors to detect the state of the switch. Power is obtained from the circuit being connected to, providing the correct logic drive levels. Finally, the unused debounce circuit is simply left with no connection to it. This is acceptable in this case, as the internal pullup resistor will prevent the input to circuit 3 from floating. Another variation on this circuit would have been to invert the direction control input by connecting pin 3 to pin 4 on the ELM410, then use pin 5 to drive pin 3 of the ELM310. This would have resulted in the direction pushbutton causing a counter-clockwise rotation when pressed due to the double inversion from the two debounce circuits connected in series. For more permanent installations, consideration should be given to protecting the ELM410 from electrostatic discharges, etc. by providing series current limiting resistors, and additional pullup resistors. For typical useage in prototyping and experimenter circuits, however, nothing more than is shown below would normally be required. ELM410 ELM410DSB Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > 2 3 4 7 6 5 1 2 3 4 8 7 6 5 +5V 8 1 0.1µF +5V A B C D To winding drive circuits Step Clockwise |
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