Modifications

{{underline|Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current.}} Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a switching step-down power supply). Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. Additionally, please note that the coil current is a function of the set current limit, but it does not necessarily equal the current limit setting. The actual current through each coil changes with each microstep. See the DRV8825 datasheet for more information.}}

{{underline|Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current.}} Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be quite a bit lower than the coil current (the driver and coil basically act like a switching step-down power supply). Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. Additionally, please note that the coil current is a function of the set current limit, but it does not necessarily equal the current limit setting. The actual current through each coil changes with each microstep. See the DRV8825 datasheet for more information.}}

== Diagramme schématique ==

== Diagramme ==

[[Fichier:DRV8825-schema.png]]

[[Fichier:DRV8825-schema.png|800px]]

The current sense resistors (R2 and R3) on the DRV8825 carrier are 0.100 Ω. This schematic is also available as a [http://www.pololu.com/file/download/drv8824-drv8825-stepper-motor-driver-carrier-schematic-diagram.pdf?file_id=0J603 downloadable pdf] (196k pdf).

The current sense resistors (R2 and R3) on the DRV8825 carrier are 0.100 Ω. This schematic is also available as a [http://www.pololu.com/file/download/drv8824-drv8825-stepper-motor-driver-carrier-schematic-diagram.pdf?file_id=0J603 downloadable pdf] (196k pdf).