stepper/README.md

# stepper

stepper motor control via RPi

# A4988 driver
## wiring
GND     3-5.5V ground                   DIRECTION   -> pi gpio
VDD     3-5.5V logic power supply       STEP
1B      stepper coil 1                  SLEEP       --l
1A      stepper coil 1                  RESET       --l
2A      stepper coil 2                  MS3         -> pi gpio
2B      stepper coil 2                  MS2         -> pi gpio
GND     8-35V ground                    MS1         -> pi gpio
VMOT    8-35V stepper power supply      ENABLE      -> pi gpio

## current limiting
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.
Initial commit 2019-10-11 23:54:42 +02:00			`# stepper`

add wiring detail 2019-10-14 12:53:24 +01:00			`stepper motor control via RPi`

update 2019-12-09 23:26:37 +00:00			`# A4988 driver`
			`## wiring`
add wiring detail 2019-10-14 12:53:24 +01:00			`GND 3-5.5V ground DIRECTION -> pi gpio`
			`VDD 3-5.5V logic power supply STEP`
			`1B stepper coil 1 SLEEP --l`
			`1A stepper coil 1 RESET --l`
			`2A stepper coil 2 MS3 -> pi gpio`
			`2B stepper coil 2 MS2 -> pi gpio`
			`GND 8-35V ground MS1 -> pi gpio`
			`VMOT 8-35V stepper power supply ENABLE -> pi gpio`
update 2019-12-09 23:26:37 +00:00
			`## current limiting`
			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.