Bill of Materials

flux

Generated BOM below with U2, A RS485 B, J1, and J2 excluded / DNP.
Pricing basis: lowest available unit price shown in Flux BOM distributor data. Items with no distributor pricing are marked N/A and excluded from the known-priced subtotal.
Capacitors

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
C1, C2, C6, C10, C11, C1260.1 µF0603Not specifiedNot specifiedCeramic capacitorN/AN/A
C3, C4, C8310 µF0603Not specifiedNot specifiedCeramic capacitorN/AN/A
C5, C9210 µF0805Not specifiedNot specifiedCeramic capacitorN/AN/A
Resistors

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
R1, R8, R9310 kΩ0603Not specifiedNot specifiedChip resistorN/AN/A
R2, R325.1 kΩ0603Not specifiedNot specifiedUSB-C CC resistorN/AN/A
R411 kΩ0603Not specifiedNot specifiedLED/current-limit resistorN/AN/A
R5, R6, R7310 Ω0603Not specifiedNot specifiedSeries resistorN/AN/A
Diodes / Protection

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
D11Schottky diode, 40 V, 1 ASOD-1231N5819HW-7-FDiodes IncorporatedSchottky diode$0.03279$0.03279
D21USB TVS arraySOT-23-6L82400102Würth Elektronik7.7 V typ clamp TVS diode array$0.73282$0.73282
D31RS-485 TVSSOT-23SM712MDDRS-485 transient voltage suppressor$0.02142$0.02142
LEDs

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
PWR1Indicator LED0805Not specifiedNot specifiedPower indicator LEDN/AN/A
Switches

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
RST, BOOT2SPST-NO tactile switchSide-actuated SMDTL3330AF260QGE-SwitchRight-angle tactile switch$0.31$0.62
Connectors

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
USB11USB-C receptacle24-pin USB-C, 8.94 × 7.3 mmTYPE-C-31-M-12Korean Hroparts ElecUSB Type-C receptacle$0.15864$0.15864
Transistors

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
Q1, Q22N-channel MOSFETSOT-23-3BSS138onsemi50 V, 220 mA N-channel MOSFET$0.00745$0.01490
Integrated Circuits / Regulators

Table

Designator(s)QtyValuePackageMPNManufacturerDescriptionEst. UnitExt.
IC11USB-UART bridgeSOIC-16CH340CWCH / WahUSB-to-serial converter$0.50530$0.50530
IC31RS-485 transceiverSOIC-8MAX3485CSA+Maxim IntegratedHalf-duplex RS-485 / RS-422 transceiver$3.00600$3.00600
U113.3 V LDO regulatorSOT-223AMS1117-3.3AMS3.3 V linear regulator$0.02140$0.02140
DNP / Excluded From BOM

Table

DesignatorReason
U2User requested not populated
A RS485 BUser requested not populated
J1User requested not populated
J2User requested not populated
Cost Summary
  • Populated BOM quantity: 32 components
  • Known-priced subtotal: $5.11
  • Items without available pricing: capacitors, resistors, and PWR LED
  • Estimated total using available pricing only: $5.11+
    Actual total will be higher once specific priced passives and LED are selected.
N

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Export this BOM as a CSV with the DNP parts excluded.

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I’ll create a CSV BOM file with the requested DNP parts excluded and include the grouped line items plus cost fields.

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Done — CSV BOM created with U2, A RS485 B, J1, and J2 excluded:
Known-priced subtotal in the CSV is $5.11327, excluding unpriced passives/LED.
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Files

Schematic

Layout

Preview

RS485_TX
RS485_EN
RS485_TX
GPIO21
GPIO34
RS485_B
GPIO25
GPIO27
GPIO22
RS485_A
GPIO35
GPIO33
GPIO12
RS485_RX
RS485_RX
GPIO26
GPIO13
GPIO32
GPIO14
GPIO23
ESP_IO0
GPIO27
+3V3
+5V
R6
Resistance
10 Ω
R5
Resistance
10 Ω
+3V3
R7
Resistance
10 Ω
R8
Resistance
10kΩ
+3V3
R9
Resistance
10kΩ
C11
Capacitance
0.1uF
C10
Capacitance
0.1uF
C12
Capacitance
0.1uF
BOOT
TERM
IC3
D3

ESP32 RS485 (Modbus) Controller Reference Design