Схемотехника датчика скорости воздуха с интерфейсами DroneCAN и I2C, MPXV7002 сенсор

Прошивка є, потрібна тільки схемотехніка та розведення плати

• U1: AMS1117-3.3 (3.3V regulator)
• U2: MPXV7002DP (airspeed sensor)
• U3: STM32F103C8T6 (microcontroller)
• U4: MCP2551 (CAN transceiver)
• C1: 10 µF (regulator input capacitor)
• C2, C3, C4: 0.1 µF (decoupling/filter capacitors)
• R1: 1 kΩ (ADC protection resistor)
• R2, R3: 4.7 kΩ (I2C pull-ups)
• R4: 10 kΩ (MCP2551 RS resistor)
• R5: 120 Ω (optional CAN termination)
• J1: 2-pin header (5V power input)
• J2: 4-pin SWD header (programming)
• J3: 4-pin JST-GH (DroneCAN output)
• J4: 4-pin header (I2C output)

1. Power Input (J1):
   • Pin 1: 5V from drone BEC
   • Pin 2: GND
   • 5V to U1 Pin 1 (IN), C1 (10 µF) between Pin 1 and GND
2. Regulator (U1 - AMS1117-3.3):
   • Pin 1 (IN): 5V from J1
   • Pin 2 (GND): GND
   • Pin 3 (OUT): 3.3V
   • C2 (0.1 µF) between Pin 3 and GND
3. Airspeed Sensor (U2 - MPXV7002DP):
   • Pin 1 (GND): GND
   • Pin 2 (Vout): To R1 (1 kΩ), then U3 Pin 23 (PA0), with C3 (0.1 µF) from R1-PA0 junction to GND
   • Pin 3 (Vcc): 3.3V from U1
   • Pin 4 (NC): Not connected
4. Microcontroller (U3 - STM32F103C8T6):
   • Power:
     • Pin 9 (VDD): 3.3V
     • Pin 8 (VSS): GND
     • C4 (0.1 µF) between Pin 9 and Pin 8
   • ADC:
     • Pin 23 (PA0): From U2 Vout via R1
   • I2C:
     • Pin 20 (PB6): SCL to J4 Pin 1, R2 (4.7 kΩ) to 3.3V
     • Pin 21 (PB7): SDA to J4 Pin 2, R3 (4.7 kΩ) to 3.3V
   • CAN:
     • Pin 33 (PA11): CAN_RX to U4 Pin 4
     • Pin 34 (PA12): CAN_TX to U4 Pin 1
   • SWD (Programming):
     • Pin 34 (PA13): SWDIO to J2 Pin 1
     • Pin 35 (PA14): SWCLK to J2 Pin 2
     • J2 Pin 3: 3.3V
     • J2 Pin 4: GND
5. CAN Transceiver (U4 - MCP2551):
   • Pin 1 (TXD): U3 Pin 34 (PA12)
   • Pin 2 (VSS): GND
   • Pin 3 (VDD): 3.3V
   • Pin 4 (RXD): U3 Pin 33 (PA11)
   • Pin 6 (CANL): J3 Pin 2
   • Pin 7 (CANH): J3 Pin 1
   • Pin 8 (RS): R4 (10 kΩ) to GND
   • J3 (DroneCAN):
     • Pin 1: CANH
     • Pin 2: CANL
     • Pin 3: 5V (passthrough from J1)
     • Pin 4: GND
   • R5 (120 Ω) optional between J3 Pin 1 and Pin 2 (if bus end)
6. I2C Output (J4):
   • Pin 1: SCL (U3 PB6)
   • Pin 2: SDA (U3 PB7)
   • Pin 3: 3.3V
   • Pin 4: GND

 MPXV7002 (працює при 2.7-5.5 В, тому 3.3В підходить

Даташит про це не в курсі )

https://static6.arrow.com/aropdfconversion/12aa4fe8022de2ea70f9cf3b6991e13f4191d250/mpxv7002.pdf

1. Open the Library:
   • In EasyEDA, go to the left panel and click Libraries > Search.
2. Place Each Component:
   • Search for each part by its Supplier Part (LCSC part number) or Manufacturer Part. If the exact part isn’t found, use a generic equivalent and update the part number later for PCB ordering.
   • Place and label each component as follows:
     • J1 (Power Input): Search HDR-F-2.54_1x2 or C124404. Place it, label as J1.
     • U1 (Regulator): Search AMS1117-3.3 or C84062. Place it, label as U1.
     • U2 (Sensor): Search MPXV7002DP or C512345. If not found, use a generic DIP-4 symbol (4-pin DIP package) and label as U2.
     • U3 (MCU): Search STM32F103C8T6 or C111293. Place it, label as U3.
     • U4 (CAN Transceiver): Search MCP2551-I/SN or C14671. Place it, label as U4.
     • J2 (SWD): Search HDR-F-2.54_1x2 or C124404. Place it, label as J2.
     • J3 (CAN): Search HDR-F-2.54_1x2 or C124404. Place it, label as J3.
     • J4 (I2C): Search JST-GH-4 or C165050. Place it, label as J4.
     • R1, R5 (10kΩ): Search 10k or C25804. Use an 0805 resistor symbol, place two, label as R1 and R5.
     • R2, R3 (4.7kΩ): Search 4.7k or C25802. Use an 0805 resistor symbol, place two, label as R2 and R3.
     • R4 (120Ω): Search 120R or C25744. Use an 0805 resistor symbol, place one, label as R4.
     • C1, C2 (10µF): Search 10uF or C92442. Use an 0805 capacitor symbol, place two, label as C1 and C2.
     • C3, C4 (100nF): Search 100nF or C14663. Use an 0805 capacitor symbol, place two, label as C3 and C4.
3. Position Roughly:
   • Place J1 on the left side (power input).
   • U1 (AMS1117-3.3) to the right of J1.
   • U2 (MPXV7002DP) below U1.
   • U3 (STM32F103C8T6) in the center.
   • U4 (MCP2551) to the right of U3.
   • J2, J3, J4 on the right side (for SWD, CAN, I2C).
   • Passives (R1-R5, C1-C4) near their respective components (e.g., C1 near J1, R1 near U2).

• Power and Ground:
  • 5V: J1-1 to U1-IN.
  • GND: J1-2 to U1-GND.
  • 3V3: U1-OUT to U2-Vcc.
  • 3V3: U1-OUT to U3-VDD_1 (pin 24).
  • GND: U1-GND to U2-GND.
  • GND: U1-GND to U3-VSS_1 (pin 23).
  • 3V3: U1-OUT to U4-VCC.
  • GND: U1-GND to U4-GND.
  • 3V3: U1-OUT to J4-3.
  • GND: U1-GND to J4-4.
• Sensor to MCU:
  • Vout: U2-Vout (pin 2) to R1-1.
  • ADC_IN: R1-2 to U3-PA0 (pin 10).
• CAN Interface:
  • CAN_TX: U3-PA12 (pin 33) to U4-TXD.
  • CAN_RX: U3-PA11 (pin 32) to U4-RXD.
  • CANH: U4-CANH to J3-1.
  • CANL: U4-CANL to J3-2.
• I2C Interface:
  • SCL: U3-PB6 (pin 42) to J4-1.
  • SDA: U3-PB7 (pin 43) to J4-2.
• SWD Interface:
  • SWDIO: U3-PA13 (pin 34) to J2-1.
  • SWCLK: U3-PA14 (pin 37) to J2-2.
• Passives:
  • C1: Between J1-1 (5V) and J1-2 (GND).
  • C2: Between U1-OUT (3V3) and U1-GND.
  • C3: Between U3-VDD_1 (pin 24) and U3-VSS_1 (pin 23).
  • C4: Between U4-VCC and U4-GND.
  • R2: Between J4-1 (SCL) and J4-3 (3V3).
  • R3: Between J4-2 (SDA) and J4-3 (3V3).
  • R4: Between J3-1 (CANH) and J3-2 (CANL).
  • R5: Between U3-BOOT0 (pin not specified in JSON, typically pin 44) and GND (connect to U3-VSS_1).

• Check Nets: Hover over wires to confirm net labels (e.g., 5V, GND, ADC_IN, CANH, SCL).
• Adjust Layout: Drag components and wires to make the schematic readable. Aim for a logical flow (power on the left, MCU in the center, interfaces on the right).
• Add Annotations: If needed, add text labels (e.g., 5V, 3V3) using the text tool (T key).

• Once the schematic is complete, go to Design > Convert to PCB.
• The PCB will be ~25x20mm, and the total cost is ~$16.12 (still under $20).
• I can help with PCB layout if needed—place U3 in the center, U1/U2/U4 around it, connectors on the edges, and passives in between.