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Updated A4988 Stepper Motor Controller (markdown)

Michael Ingraham 2019-09-08 22:46:36 -04:00
parent 865af6dec5
commit b18795c814
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18
A4988-Stepper-Motor-Controller.md

@ -10,17 +10,17 @@ Connector | Description
:-:|-
DIR|Direction of rotation
STEP|Initiate stepping
SLP| Sleep (not implemented)
RST| Reset (not implemented)
MS3|
MS2|Set microstep increment 1/1 to 1/16th
MS1|
SLP|Sleep (not implemented)
RST|Reset (not implemented)
MS1|Microstep increment select
MS2|Microstep increment select
MS2|Microstep increment select
EN|Enable the power supply for the motor
There are six corresponding GPIO components for this Tasmota driver. These should be configured to free GPIO pins of the device using a Template or Module:
There are six corresponding GPIO [components](Components) for this Tasmota driver. These should be configured to free GPIO pins of the device using a [Template](Templates) or [Module](Modules):
`A4988 DIR (170)`
`A4988 STP (171)` (step)
`A4988 ENA (172)` (enable)
`A4988 STP (171)`
`A4988 ENA (172)`
`A4988 MS1 (173)`
`A4988 MS2 (174)`
`A4988 MS3 (175)`
@ -30,7 +30,7 @@ The minimal configuration for the A4988 are the `DIR` and `STEP` signals. In suc
## Use cases
The cheap auto-feeder for my cats broke. It was a fancy plastic-thingy with voice-recording-function & programmable to feed several times a day after playing back your voice (cats don't give a sh$7 for your voice - they come when they hear the food falling into the bowl). It was never precise - a concern for the amount of nutrition it gave the cats. And it was not reliable, as the torque of the internal moving mechanism was insufficient to spin the separator/proportioning wheel through the food reliably. In addition, the batteries were always drained in a day meaning very grumpy cats when we returned!
Thus the wish to install a high-torque stepper-motor (with shifting gear) was born. I could power it with mains instead of relying on a battery, control it over WiFi from my smarthome automation hub. Tasmota now offers a way to do this!
Thus the wish to install a high-torque stepper-motor (with shifting gear) was born. I could power it with mains instead of relying on a battery, control it over WiFi from my home automation hub. Tasmota now offers a way to do this!
The **"TasmotaSmartCatFeeder"** circuit consists of a WeMos D1 mini, a A4988 controller, and two power supplies (5V&12V). This all fits into the housing of the feeder and costs less than 50€!