I have a project trying to motorize my roller blinds (they are pretty heavy), I have a nodeMCU ESP8266 powered by the USB port, connected to a A4988 driver, with a XL6009 voltage converter (5V input from the NodeMCU, 12V output for the motor) with a 100uf capacitor on the output, and a Nema17 motor.. I thought it would be strong enough for the blinds.. but I'm thinking I'm doing something wrong...
This is the schema of the project
The data for the Nema17 motor:
FOR NEMA 17 bipolar 1.65 inch x 1.65 inch x 0.79 inch 4 wire
This is Short Height FOR Bipolar Nema 17 stepper motor with 1.8 degree. Step angle (200 steps / revolution).
Each phase draws current 1A, giving a holding torque of 13Ncm (18.4oz.in).
Manufacturer Part Number: 17HS08-1004S
Motor Type: Bipolar Stepper
Step Angle: 1.8 degrees.
Nominal Current / phase: 1.0A
Phase Resistance: 3.5 ohm
Inductance: 4.5mH +/- 20% (1 KHz)
Vref for the A4988 driver is set to 0.67v
When the motor on the table, it turns nicely, but once I'm putting the beaded chain through the pulley - it's just trying to move, but cannot pull the chain..
Would appreciate ideas about what to check or how to fix.