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docs(bom): add purchase column and markdown BOM with combo-kit sourcing

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Adds Purchase column to bom.csv with verified sourcing links and a
companion BOM.md with grouped tables, combo-kit recommendations, and
critical pre-order notes.

Flagged during research:
- U1 package description was wrong (3.5x3.5mm); TPS61088 RHL is
  actually VQFN-20 4.5x3.5mm. KiCad footprint is correct, only the
  BOM description was off.
- PCB silkscreen shows TPS61088QRHLRQ1 (auto Q1) but the non-Q1
  TPS61088RHLR is a drop-in substitute with the same RHL pinout and
  is ~5x cheaper at LCSC.
- Pinout verified: schematic pins 1/3/4/5/6/7/8/9/11/12/15 match the
  TI datasheet RHL pinout.

Combo kits collapse R1-R5 (E96 sample book), C6/C8/C9 (0805 ceramic
kit), and C4/C5/C10/C11 (22uF 1206 50-pack) into single orders.

Constraint: ESP32 module excluded per user — sourced separately.
Constraint: L1 must handle >=10A; no-name AliExpress inductors avoided.
Directive: If swapping L1 to TDK SPM10065 from Bourns SRP1265, verify
KiCad footprint matches before ordering (10.5x10mm vs 12.6x12.6mm).
Confidence: high
Scope-risk: narrow
Not-tested: actual delivery/fitment of recommended AliExpress parts
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Reference,Component,Value,Qty,Package,AliExpress Search/Link,AliExpress Price Est.,DigiKey Part Number,DigiKey Price Est.,Notes
ESP32-WROOM1,ESP32-WROOM-32 DevKit,ESP32-C3-DevKitM-1,1,Module,"ESP32 WROOM 32 development board 30 pin",~$4.00,N/A (use Adafruit/SparkFun),,Type-C versions slightly more
A4988,A4988 Stepper Motor Driver,Pololu_Breakout_A4988,1,Module,"A4988 stepper motor driver module heatsink",~$2.00,Pololu #1182,~$5.95,Usually comes with heatsink. Packs of 5 ~$5
U1,TPS61088 Boost Converter IC,TPS61088RHLR,1,QFN-20 3.5x3.5mm,"TPS61088RHLR QFN20",~$2.28/ea (3pcs min ~$6.84),296-40481-1-ND,~$3.89,LCSC C87357 ~$0.44/ea as alternative
R1,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
R2,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
R5,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,
R3,Resistor 0805 1% (feedback divider),30.1K,1,0805,"0805 resistor 30.1K 1% SMD",~$1.50/100pcs,RC0805FR-0730K1L,~$0.10,E96 value - not in basic kits. 1% required.
R4,Resistor 0805 1% (feedback divider),190K,1,0805,"0805 resistor 190K 1% SMD",~$1.50/100pcs,RC0805FR-07190KL,~$0.10,E96 value - not in basic kits. 1% required.
C8,Capacitor 0805 C0G/NP0 50V,47pF,1,0805,"0805 47pF capacitor C0G",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,C0G preferred for low-value caps
C9,Capacitor 0805 X7R 50V,100nF,1,0805,"0805 100nF 0.1uF capacitor",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,Decoupling cap
C6,Capacitor 0805 X7R 50V,22nF,1,0805,"0805 22nF capacitor X7R",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,TPS61088 compensation cap
C4,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
C5,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
C10,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
C11,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,Must be 25V+ rated for 12V output
C3,Capacitor SMD Electrolytic 25V,100uF,1,6.3x5.8mm,"100uF 25V SMD aluminum electrolytic capacitor 6.3mm",~$1.30/20pcs,Standard Nichicon/Panasonic,~$0.50,Verify pad matches KiCad footprint
L1,Power Inductor Shielded SMD,2.2uH,1,12.6x12.6mm,"SRP1265 2.2uH inductor",~$3.00,SRP1265A-2R2M (Bourns),~$2-3,Must handle >=10A. Critical for TPS61088. DigiKey safest source.
SW1,JST EH 3-pin Header,B3B-EH-A,1,Through-hole,"JST EH 3 pin connector 2.5mm header",~$1.00/10pcs,B3B-EH-A(LF)(SN),~$0.13,2.5mm pitch. Buy matching housings + crimp pins.
MotorPower1,Screw Terminal 3-pin 5mm pitch,KF301-5.0-3P,1,Through-hole,"KF301 3 pin 5mm screw terminal PCB",~$0.50-1.00,Standard part,~$0.50-1.00,KF301-5.0-3P common Chinese equivalent
StepperConnection1,JST XH 4-pin Header,B4B-XH-A,1,Through-hole,"JST XH 4 pin 2.54mm connector header",~$1.00/20pcs,B4B-XH-A(LF)(SN),~$0.15,2.54mm pitch. Buy matching housings + crimp pins.
Reference,Component,Value,Qty,Package,AliExpress Search/Link,AliExpress Price Est.,DigiKey Part Number,DigiKey Price Est.,Purchase,Notes
ESP32-WROOM1,ESP32-WROOM-32 DevKit,ESP32-C3-DevKitM-1,1,Module,"ESP32 WROOM 32 development board 30 pin",~$4.00,N/A (use Adafruit/SparkFun),,SKIP - user sources separately,Pinout-specific module sourced from special supplier. Do not order.
A4988,A4988 Stepper Motor Driver,Pololu_Breakout_A4988,1,Module,"A4988 stepper motor driver module heatsink",~$2.00,Pololu #1182,~$5.95,"AliExpress 5-pack: https://www.aliexpress.com/wholesale?SearchText=A4988+stepper+driver+5pcs (~$5-8 for 5pcs with heatsinks)",Get the 5-pack from any AliExpress seller; quality varies but functional. Heatsinks included.
U1,TPS61088 Boost Converter IC,TPS61088RHLR,1,VQFN-20 4.5x3.5mm (RHL),"TPS61088RHLR QFN20",~$2.28/ea (3pcs min ~$6.84),296-40481-1-ND,~$3.89,"LCSC C87357: https://www.lcsc.com/product-detail/DC-DC-Converters_TI_TPS61088RHLR_TPS61088RHLR_C87357.html (~$0.61/ea, 14k in stock)",PACKAGE CORRECTION: TPS61088 RHL is 4.5x3.5mm not 3.5x3.5mm. PCB silkscreen says TPS61088QRHLRQ1 (auto Q1) but non-Q1 TPS61088RHLR is drop-in substitute with identical pinout - use the cheaper non-Q1. Pinout verified: pins 1/3/4/5/6/7/8/9/11/12/15 = VIN/EN/SS-TR/COMP/FB/AGND/PGOOD/VOUT/BST/SW/PGND.
R1,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,"COMBO: 0805 E96 1% resistor sample book (170 values x 25pcs, ~$25 covers R1+R2+R3+R4+R5 and lifetime supply)",Use combo kit - see Notes section below.
R2,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,COVERED BY RESISTOR KIT,Use the 0805 E96 sample book.
R5,Resistor 0805 1%,10K,1,0805,"0805 resistor 10K 1%",~$1.50/100pcs,RC0805FR-0710KL,~$0.10,COVERED BY RESISTOR KIT,Use the 0805 E96 sample book.
R3,Resistor 0805 1% (feedback divider),30.1K,1,0805,"0805 resistor 30.1K 1% SMD",~$1.50/100pcs,RC0805FR-0730K1L,~$0.10,"COVERED BY 170-value E96 kit (30.1K is E96 standard value)",E96 standard - in any decent E96 kit like Amazon B09Z2RDW2F. If buying singles: LCSC.
R4,Resistor 0805 1% (feedback divider),190K,1,0805,"0805 resistor 190K 1% SMD",~$1.50/100pcs,RC0805FR-07190KL,~$0.10,"COVERED BY 170-value E96 kit (190K is E96 standard value)",E96 standard - in any decent E96 kit. Critical to feedback divider - must be 1%.
C8,Capacitor 0805 C0G/NP0 50V,47pF,1,0805,"0805 47pF capacitor C0G",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,"COMBO: 0805 SMD ceramic capacitor kit covering 22nF/47pF/100nF (e.g. AliExpress 0603/0805/1206 50V 22p-22uF kit, ~$5)",Use combo cap kit - C0G preferred but X7R acceptable at this value.
C9,Capacitor 0805 X7R 50V,100nF,1,0805,"0805 100nF 0.1uF capacitor",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,COVERED BY CAPACITOR KIT,Universal decoupling value - included in every cap kit.
C6,Capacitor 0805 X7R 50V,22nF,1,0805,"0805 22nF capacitor X7R",~$1.00/100pcs,Standard YAGEO/Samsung,~$0.10,COVERED BY CAPACITOR KIT,Compensation cap - tolerance not critical.
C4,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,"AliExpress 50-pack CL31A226KAHNNNE: https://www.aliexpress.com/item/32751090379.html (~$8/50pcs) - one order covers C4/C5/C10/C11",Samsung CL31A226KAHNNNE is direct equivalent to Murata GRM31CR61E226KE15L. Must be 25V+ (12V output bus).
C5,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,COVERED BY 50-PACK ABOVE,Same as C4 - one 50-pack covers all four positions.
C10,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,COVERED BY 50-PACK ABOVE,Same as C4.
C11,Capacitor 1206 X5R 25V,22uF,1,1206,"1206 SMD capacitor 22uF 25V",~$2.50/100pcs,GRM31CR61E226KE15L,~$0.50,COVERED BY 50-PACK ABOVE,Same as C4.
C3,Capacitor SMD Electrolytic 25V,100uF,1,6.3x5.8mm,"100uF 25V SMD aluminum electrolytic capacitor 6.3mm",~$1.30/20pcs,Standard Nichicon/Panasonic,~$0.50,"AliExpress 10-pack: search '100uF 25V SMD 6.3x5.8mm' (~$2-3 for 10pcs). LCSC: Lelon VEJ101M1EQRJ ~$0.15/ea",Verify pad layout matches KiCad footprint (CP_Elec_6.3x5.8). Cheaper SMD electrolytics from JAMICON/Lelon are fine.
L1,Power Inductor Shielded SMD,2.2uH,1,12.6x12.6mm,"SRP1265 2.2uH inductor",~$3.00,SRP1265A-2R2M (Bourns),~$2-3,"BEST: LCSC TDK SPM10065VT-2R2M-D C1015860 (10.5x10mm, 16.6A, ~$1.50). Alt: DigiKey Bourns SRP1265A-2R2M (12.6x12.6mm, 22A, ~$3)",CRITICAL - must handle >=10A continuous. TDK SPM10065 is smaller and cheaper than Bourns SRP1265 - verify your KiCad footprint matches the chosen part's pad pattern BEFORE ordering. Avoid no-name AliExpress inductors - saturation current is often misrated.
SW1,JST EH 3-pin Header,B3B-EH-A,1,Through-hole,"JST EH 3 pin connector 2.5mm header",~$1.00/10pcs,B3B-EH-A(LF)(SN),~$0.13,"AliExpress JST-EH 2.5mm 3-pin kit with housing+crimps (50-set ~$4-6, search 'JST-EH 2.5mm 3-pin housing crimp')",Make sure to get matching female housings and crimp terminals - not just the PCB header. EH series specifically (NOT XH or PH).
MotorPower1,Screw Terminal 3-pin 5mm pitch,KF301-5.0-3P,1,Through-hole,"KF301 3 pin 5mm screw terminal PCB",~$0.50-1.00,Standard part,~$0.50-1.00,"AliExpress 10-pack: https://www.aliexpress.com/item/32842003333.html (~$0.70/10pcs)",Generic Chinese part - any KF301-5.0-3P seller works.
StepperConnection1,JST XH 4-pin Header,B4B-XH-A,1,Through-hole,"JST XH 4 pin 2.54mm connector header",~$1.00/20pcs,B4B-XH-A(LF)(SN),~$0.15,"COMBO: AliExpress JST-XH 2.54mm full kit (560pcs 2/3/4/5/6-pin housing+crimps+headers, ~$8-12) - massive overkill but covers all future projects",Search 'JST-XH 2.54mm connector kit 560pcs'. Brand names: Taiss, GTIWUNG, HALJIA all sell equivalent kits.
,,,,,,,,,,
SUMMARY,,,,,,,,,,
,,,,,,,,,,
COMBO PACK RECOMMENDATIONS:,,,,,,,,,,
"1. 0805 E96 1% Resistor Sample Book (170 values x 25pcs)",,,,,,,,,~$15-25,Covers R1/R2/R3/R4/R5 + every future project. Must be E96 (1%) to include 30.1K and 190K.
"2. 0805 SMD Ceramic Capacitor Kit (50V, 22pF-22uF range)",,,,,,,,,~$5-15,Covers C6/C8/C9 (22nF/47pF/100nF). Make sure kit includes those specific values.
"3. 1206 22uF 25V X5R 50-pack",,,,,,,,,~$8,Covers C4/C5/C10/C11.
"4. JST-XH 2.54mm Connector Kit (multi-pin)",,,,,,,,,~$8-12,Covers StepperConnection1 (4-pin) + future projects.
"5. JST-EH 2.5mm 3-pin Kit (housing+crimps+header)",,,,,,,,,~$4-6,Covers SW1. Make sure it's EH series specifically.
,,,,,,,,,,
SINGLE-PART KEY ITEMS:,,,,,,,,,,
"U1 TPS61088RHLR - LCSC C87357",,,,,,,,,~$0.61,The non-Q1 variant is drop-in substitute for TPS61088QRHLRQ1 on PCB silkscreen. Same RHL package same pinout.
"L1 TDK SPM10065VT-2R2M-D - LCSC C1015860",,,,,,,,,~$1.50,VERIFY footprint match before ordering - SPM10065 (10.5x10mm) vs original Bourns SRP1265 (12.6x12.6mm).
"C3 100uF 25V SMD electrolytic - any 6.3x5.8mm 10-pack",,,,,,,,,~$2-3,Verify pad layout matches your KiCad footprint.
"A4988 5-pack with heatsinks - AliExpress",,,,,,,,,~$5-8,Generic functional drivers.
"KF301-5.0-3P 10-pack - AliExpress",,,,,,,,,~$0.70,Generic part.
,,,,,,,,,,
TOTAL ESTIMATED COST:,,,,,,,,,~$50-80,One-time setup with combo kits. ~$10 in actually-used parts per board. ESP32 module sourced separately by user.
1 Reference Component Value Qty Package AliExpress Search/Link AliExpress Price Est. DigiKey Part Number DigiKey Price Est. Purchase Notes
2 ESP32-WROOM1 ESP32-WROOM-32 DevKit ESP32-C3-DevKitM-1 1 Module ESP32 WROOM 32 development board 30 pin ~$4.00 N/A (use Adafruit/SparkFun) SKIP - user sources separately Type-C versions slightly more Pinout-specific module sourced from special supplier. Do not order.
3 A4988 A4988 Stepper Motor Driver Pololu_Breakout_A4988 1 Module A4988 stepper motor driver module heatsink ~$2.00 Pololu #1182 ~$5.95 AliExpress 5-pack: https://www.aliexpress.com/wholesale?SearchText=A4988+stepper+driver+5pcs (~$5-8 for 5pcs with heatsinks) Usually comes with heatsink. Packs of 5 ~$5 Get the 5-pack from any AliExpress seller; quality varies but functional. Heatsinks included.
4 U1 TPS61088 Boost Converter IC TPS61088RHLR 1 QFN-20 3.5x3.5mm VQFN-20 4.5x3.5mm (RHL) TPS61088RHLR QFN20 ~$2.28/ea (3pcs min ~$6.84) 296-40481-1-ND ~$3.89 LCSC C87357: https://www.lcsc.com/product-detail/DC-DC-Converters_TI_TPS61088RHLR_TPS61088RHLR_C87357.html (~$0.61/ea, 14k in stock) LCSC C87357 ~$0.44/ea as alternative PACKAGE CORRECTION: TPS61088 RHL is 4.5x3.5mm not 3.5x3.5mm. PCB silkscreen says TPS61088QRHLRQ1 (auto Q1) but non-Q1 TPS61088RHLR is drop-in substitute with identical pinout - use the cheaper non-Q1. Pinout verified: pins 1/3/4/5/6/7/8/9/11/12/15 = VIN/EN/SS-TR/COMP/FB/AGND/PGOOD/VOUT/BST/SW/PGND.
5 R1 Resistor 0805 1% 10K 1 0805 0805 resistor 10K 1% ~$1.50/100pcs RC0805FR-0710KL ~$0.10 COMBO: 0805 E96 1% resistor sample book (170 values x 25pcs, ~$25 covers R1+R2+R3+R4+R5 and lifetime supply) Use combo kit - see Notes section below.
6 R2 Resistor 0805 1% 10K 1 0805 0805 resistor 10K 1% ~$1.50/100pcs RC0805FR-0710KL ~$0.10 COVERED BY RESISTOR KIT Use the 0805 E96 sample book.
7 R5 Resistor 0805 1% 10K 1 0805 0805 resistor 10K 1% ~$1.50/100pcs RC0805FR-0710KL ~$0.10 COVERED BY RESISTOR KIT Use the 0805 E96 sample book.
8 R3 Resistor 0805 1% (feedback divider) 30.1K 1 0805 0805 resistor 30.1K 1% SMD ~$1.50/100pcs RC0805FR-0730K1L ~$0.10 COVERED BY 170-value E96 kit (30.1K is E96 standard value) E96 value - not in basic kits. 1% required. E96 standard - in any decent E96 kit like Amazon B09Z2RDW2F. If buying singles: LCSC.
9 R4 Resistor 0805 1% (feedback divider) 190K 1 0805 0805 resistor 190K 1% SMD ~$1.50/100pcs RC0805FR-07190KL ~$0.10 COVERED BY 170-value E96 kit (190K is E96 standard value) E96 value - not in basic kits. 1% required. E96 standard - in any decent E96 kit. Critical to feedback divider - must be 1%.
10 C8 Capacitor 0805 C0G/NP0 50V 47pF 1 0805 0805 47pF capacitor C0G ~$1.00/100pcs Standard YAGEO/Samsung ~$0.10 COMBO: 0805 SMD ceramic capacitor kit covering 22nF/47pF/100nF (e.g. AliExpress 0603/0805/1206 50V 22p-22uF kit, ~$5) C0G preferred for low-value caps Use combo cap kit - C0G preferred but X7R acceptable at this value.
11 C9 Capacitor 0805 X7R 50V 100nF 1 0805 0805 100nF 0.1uF capacitor ~$1.00/100pcs Standard YAGEO/Samsung ~$0.10 COVERED BY CAPACITOR KIT Decoupling cap Universal decoupling value - included in every cap kit.
12 C6 Capacitor 0805 X7R 50V 22nF 1 0805 0805 22nF capacitor X7R ~$1.00/100pcs Standard YAGEO/Samsung ~$0.10 COVERED BY CAPACITOR KIT TPS61088 compensation cap Compensation cap - tolerance not critical.
13 C4 Capacitor 1206 X5R 25V 22uF 1 1206 1206 SMD capacitor 22uF 25V ~$2.50/100pcs GRM31CR61E226KE15L ~$0.50 AliExpress 50-pack CL31A226KAHNNNE: https://www.aliexpress.com/item/32751090379.html (~$8/50pcs) - one order covers C4/C5/C10/C11 Must be 25V+ rated for 12V output Samsung CL31A226KAHNNNE is direct equivalent to Murata GRM31CR61E226KE15L. Must be 25V+ (12V output bus).
14 C5 Capacitor 1206 X5R 25V 22uF 1 1206 1206 SMD capacitor 22uF 25V ~$2.50/100pcs GRM31CR61E226KE15L ~$0.50 COVERED BY 50-PACK ABOVE Must be 25V+ rated for 12V output Same as C4 - one 50-pack covers all four positions.
15 C10 Capacitor 1206 X5R 25V 22uF 1 1206 1206 SMD capacitor 22uF 25V ~$2.50/100pcs GRM31CR61E226KE15L ~$0.50 COVERED BY 50-PACK ABOVE Must be 25V+ rated for 12V output Same as C4.
16 C11 Capacitor 1206 X5R 25V 22uF 1 1206 1206 SMD capacitor 22uF 25V ~$2.50/100pcs GRM31CR61E226KE15L ~$0.50 COVERED BY 50-PACK ABOVE Must be 25V+ rated for 12V output Same as C4.
17 C3 Capacitor SMD Electrolytic 25V 100uF 1 6.3x5.8mm 100uF 25V SMD aluminum electrolytic capacitor 6.3mm ~$1.30/20pcs Standard Nichicon/Panasonic ~$0.50 AliExpress 10-pack: search '100uF 25V SMD 6.3x5.8mm' (~$2-3 for 10pcs). LCSC: Lelon VEJ101M1EQRJ ~$0.15/ea Verify pad matches KiCad footprint Verify pad layout matches KiCad footprint (CP_Elec_6.3x5.8). Cheaper SMD electrolytics from JAMICON/Lelon are fine.
18 L1 Power Inductor Shielded SMD 2.2uH 1 12.6x12.6mm SRP1265 2.2uH inductor ~$3.00 SRP1265A-2R2M (Bourns) ~$2-3 BEST: LCSC TDK SPM10065VT-2R2M-D C1015860 (10.5x10mm, 16.6A, ~$1.50). Alt: DigiKey Bourns SRP1265A-2R2M (12.6x12.6mm, 22A, ~$3) Must handle >=10A. Critical for TPS61088. DigiKey safest source. CRITICAL - must handle >=10A continuous. TDK SPM10065 is smaller and cheaper than Bourns SRP1265 - verify your KiCad footprint matches the chosen part's pad pattern BEFORE ordering. Avoid no-name AliExpress inductors - saturation current is often misrated.
19 SW1 JST EH 3-pin Header B3B-EH-A 1 Through-hole JST EH 3 pin connector 2.5mm header ~$1.00/10pcs B3B-EH-A(LF)(SN) ~$0.13 AliExpress JST-EH 2.5mm 3-pin kit with housing+crimps (50-set ~$4-6, search 'JST-EH 2.5mm 3-pin housing crimp') 2.5mm pitch. Buy matching housings + crimp pins. Make sure to get matching female housings and crimp terminals - not just the PCB header. EH series specifically (NOT XH or PH).
20 MotorPower1 Screw Terminal 3-pin 5mm pitch KF301-5.0-3P 1 Through-hole KF301 3 pin 5mm screw terminal PCB ~$0.50-1.00 Standard part ~$0.50-1.00 AliExpress 10-pack: https://www.aliexpress.com/item/32842003333.html (~$0.70/10pcs) KF301-5.0-3P common Chinese equivalent Generic Chinese part - any KF301-5.0-3P seller works.
21 StepperConnection1 JST XH 4-pin Header B4B-XH-A 1 Through-hole JST XH 4 pin 2.54mm connector header ~$1.00/20pcs B4B-XH-A(LF)(SN) ~$0.15 COMBO: AliExpress JST-XH 2.54mm full kit (560pcs 2/3/4/5/6-pin housing+crimps+headers, ~$8-12) - massive overkill but covers all future projects 2.54mm pitch. Buy matching housings + crimp pins. Search 'JST-XH 2.54mm connector kit 560pcs'. Brand names: Taiss
22
23 SUMMARY
24
25 COMBO PACK RECOMMENDATIONS:
26 1. 0805 E96 1% Resistor Sample Book (170 values x 25pcs) ~$15-25 Covers R1/R2/R3/R4/R5 + every future project. Must be E96 (1%) to include 30.1K and 190K.
27 2. 0805 SMD Ceramic Capacitor Kit (50V, 22pF-22uF range) ~$5-15 Covers C6/C8/C9 (22nF/47pF/100nF). Make sure kit includes those specific values.
28 3. 1206 22uF 25V X5R 50-pack ~$8 Covers C4/C5/C10/C11.
29 4. JST-XH 2.54mm Connector Kit (multi-pin) ~$8-12 Covers StepperConnection1 (4-pin) + future projects.
30 5. JST-EH 2.5mm 3-pin Kit (housing+crimps+header) ~$4-6 Covers SW1. Make sure it's EH series specifically.
31
32 SINGLE-PART KEY ITEMS:
33 U1 TPS61088RHLR - LCSC C87357 ~$0.61 The non-Q1 variant is drop-in substitute for TPS61088QRHLRQ1 on PCB silkscreen. Same RHL package same pinout.
34 L1 TDK SPM10065VT-2R2M-D - LCSC C1015860 ~$1.50 VERIFY footprint match before ordering - SPM10065 (10.5x10mm) vs original Bourns SRP1265 (12.6x12.6mm).
35 C3 100uF 25V SMD electrolytic - any 6.3x5.8mm 10-pack ~$2-3 Verify pad layout matches your KiCad footprint.
36 A4988 5-pack with heatsinks - AliExpress ~$5-8 Generic functional drivers.
37 KF301-5.0-3P 10-pack - AliExpress ~$0.70 Generic part.
38
39 TOTAL ESTIMATED COST: ~$50-80 One-time setup with combo kits. ~$10 in actually-used parts per board. ESP32 module sourced separately by user.