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PCB Design
I designed the board in order to be screwed to the back of a NEMA17 motor, so I had a limited space to fit all the components and connections.
To connect the Stepper Motor to the board you need a 2mm Pitch JST-PH Connector. There are 4 buttons on the left side of the board: 2 of them for Programming and 2 others to control the motor. To power the board you need a 2.1mm Barrel connector. Theres also a female dupont connector on te backside of the board to program the ESP via UART.
BOM
Footprint
Part Number
C1,C2,C4,C5,C6,C8,C10,C11,C12,C15
0.1uF 0603 Cap
C3
22n 0603 Cap
C7
1uF 0603 Cap
C9
22uF 35V 5x5.4 Cap
C13,C14
22uF 6V 3x5.4 Cap
D1
0603 Red LED
D2, D3
40V 470mV 3A Diode SBR3U40P1-7
J1
JST-PH Male Connector C132498
J2
2.54mm 4Pin Female Header
J4
Barrel Jack Connector
L1
GLE GCD53-470MC 47uH Inductor
R1,R3
15K 0603 Resistor
R2
82K 0603 Resistor
RN1, RN2
10K RYC164-JR-0710KL
SW1,SW2,SW3,SW4
4.6x2.8 SPST Switch
U1
ESP-12E
U2
TMC2208-LA-T
U3
HT7463B
U4
SPX3819M5-L-3-3
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