Drone Flight Controller Overview
NaN:NaN
Project
Datasheet
Schematic
Consult.
Query.
Using Schematic Tool.
Looking for "device summary features cpu peripherals usb interfaces operating voltage package" in en.DM00037051.pdf
Looking for "device description output voltage dropout current package pin functions" in ds1117.pdf
Looking for "device overview purpose video osd function supply interfaces pins" in MAX7456.pdf
Looking for "device overview gyroscope accelerometer interface supply pins" in MPU-6000-Datasheet1.pdf
Looking for "electrical characteristics frequency output type supply voltage" in 2304140030_NDK-NX3225GA-27MHz-STD-CRG-2_C481398.pdf
Looking for "device overview frequency resonator application" in 1810170910_Murata-Electronics-CSTCE8M00G52-R0_C22549.pdf
Project purpose
How the blocks interact
1) Power path
This looks like a drone flight controller reference design built around IC1. The project description and schematic show three main functions combined on one board:
- Flight control and I/O processing by IC1
- 6-axis motion sensing by U5
- Analog video on-screen display insertion by U2
So the board is meant to be the central controller for an FPV-style aircraft: it reads inertial motion data, exposes UART/I2C/switch/LED connections, and overlays telemetry or status graphics onto a composite video feed.
Core components
Main functional blocks
| Block | Main part | What it does |
|---|---|---|
| MCU | IC1 | STM32F405. Its datasheet says it is an Arm Cortex-M4 MCU up to 168 MHz, with USB, SPI, I2C, UARTs, timers, ADCs, and many GPIOs. |
| IMU | U5 | MPU-6000. Its datasheet describes it as a 6-axis MotionTracking device with a 3-axis gyroscope and 3-axis accelerometer, plus SPI/I2C capability. |
| Video OSD | U2 | MAX7456. Its datasheet says it is a single-channel monochrome on-screen display generator for NTSC/PAL composite video, controlled over SPI. |
| 3.3 V regulator | U1 | AMS1117-3.3. Its datasheet says it is a fixed 3.3 V LDO rated up to 800 mA. |
Clocking and support parts
| Function | Parts | Role |
|---|---|---|
| MCU clock | Y1 | 8 MHz Murata ceramic resonator for IC1. |
| OSD clock | X1 | 27 MHz crystal for U2, matching the MAX7456 datasheet requirement for a 27 MHz clock. |
| USB data conditioning | R7, R8 | 22 Ω series resistors on the USB D+/D- lines from USB to IC1. |
| I2C pullups | R2, R5 | 4.7 kΩ pullups to +3V3 for the I2C/UART header. |
| Boot/reset setup | R4, S1 | BOOT0 pull/down-up control and button input for IC1. |
| Status LEDs | LED1, LED2, R16, R17 | Two indicator LEDs driven from IC1 through 1 kΩ resistors. |
- External USB power enters through USB on +V_USB.
- D2 is a BAT54C dual Schottky diode used in the input power path.
- U1 converts the incoming supply to +3V3.
- The +3V3 rail powers IC1 and U5, with local decoupling from C4, C6, C10, C11, C12, and C13.
- The +5V rail is kept for the analog video/OSD section, especially U2, whose datasheet requires AVDD/DVDD/PVDD = 4.75 V to 5.25 V.
This project is a STM32F405-based drone flight controller template where IC1 reads motion data from U5, manages external interfaces, and drives U2 to overlay flight data onto an analog FPV video signal.
If you want, I can next break it down into:
- power architecture
- pin-by-pin interface map for IC1
- likely firmware functions
- potential design issues or review observations
Power architecture review
MCU pin map
BOM sourcing check
Layout planning
now
Ready.
IC1
OSD_MOSI
UART1_RX
OSD_CS
USB_D+
UART3_RX
NRST
GYRO_CS
LED2
+3V3
UART6_RX
UART6_RX
I2C_SDA
SW1
BUZZER
VIDEO_IN
USB_D-
I2C_SCL
+V_USB
GYRO_INT
+3V3
OSD_XFB
OSD_SCK
OSD_CS
UART1_TX
UART6_TX
OSD_MISO
SW2
UART3_RX
+V_USB
OSD_SCK
USB_D-
+3V3
+3V3
+3V3
I2C_SCL
LED1
PPM_IN
UART1_RX
SW2
OSD_MOSI
USB_D+
I2C_SDA
OSD_SAG
GYRO_SDO
UART3_TX
UART6_TX
GYRO_INT
OSD_CLKIN
+5V
UART1_TX
+3V3
UART3_TX
SW1
GYRO_SDA
+3V3
GYRO_SCL
C4
Capacitance
10uF
R7
Resistance
22 Ω
S1
R15
Resistance
10kΩ
UART_3_6
UART1_I2C
R5
Resistance
4.7kΩ
R4
Resistance
10kΩ
R14
Resistance
10kΩ
R8
Resistance
22 Ω
R9
Resistance
75 Ω
C2
Capacitance
0.1uF
C8
Capacitance
0.1uF
C11
Capacitance
0.1uF
C1
Capacitance
0.1uF
C10
Capacitance
0.1uF
C3
Capacitance
0.1uF
C13
Capacitance
0.1uF
C9
Capacitance
0.1uF
Y1
X1
C6
Capacitance
1uF
C12
Capacitance
0.1uF
Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.6k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
This is a STM32F4 Flight Controller template with 6-axis Accelerometer, Gyroscope. With OSD generator MAX7456EUI. #drone #flightController #STM32F405 #controller #OSD #video #referenceDesign #project #MPU6000 #template
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Arrow | $7.56–$8.77 |
Digi-Key | $18.50–$19.23 |
LCSC | $19.47–$19.67 |
Mouser | $14.00 |
TME | $12.65–$12.69 |
Verical | $5.73–$38.40 |
Assets
STM32F4 Flight Controller Template image.png
STM32F4 Flight Controller Template imageThumbnailControls
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