18 lines
904 B
Markdown
18 lines
904 B
Markdown
# stepper
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stepper motor control via RPi
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# A4988 driver
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## wiring
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GND 3-5.5V ground DIRECTION -> pi gpio
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VDD 3-5.5V logic power supply STEP
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1B stepper coil 1 SLEEP --l
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1A stepper coil 1 RESET --l
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2A stepper coil 2 MS3 -> pi gpio
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2B stepper coil 2 MS2 -> pi gpio
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GND 8-35V ground MS1 -> pi gpio
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VMOT 8-35V stepper power supply ENABLE -> pi gpio
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## current limiting
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Find the two sense Resistors `Rs1` and `Rs2`. They are usually on the same side of the pcb like the chip and have Values like 0.05 Ohm, 0.068 Ohm and 0.1 Ohm. Now measure the Reference Voltage without VMOT power supply but only power supply between the potientiometer and GND 3-5.5V. It should be `VREF = IMAX * 8 * Rs. And set it accordingly.
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