Setting the current on the A4899 stepper motor driver with a volt meter.
The current on the A4988 stepper drivers can be set easily with a volt-meter. The driver is setup to set a
reference voltage (volts) that determines the current (amps) to drive the stepper motors. First, we will
need to determine the correct current and resistor readings. The typical resistor values for the stepper
driver are 0.2, 0.1, 0.05 ohms, 2 of which are shown below.
Once we know the resistor value we can calculate the resistance we need by using the formula
ππππ = πΌπππ₯ β 8 β π
or πΌπππ₯ = ππππ/(8 β π
)
For the E3 CNC router we want the current to be around 0.9 amps. The settings would be as follows:
We can set the voltage by holding the negative led to ground and the positive lead to the potentiometer
as shown below. To turn the current up, turn clockwise. To turn the current down, turn counter
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