Flight Controller
About the Flight Controller PCB
Flight Controller is an open source STM32 PCB design by LongDo1902, published on GitHub. It is a 8-layer board measuring 38.5 × 38.5 mm, with 127 components from 65 distinct parts.
Its main chip is the STM32F722RET6, from the STM32 family. Other key parts include the ICM-42688-P, AT7456E, BMP388, W25Q256JVEIQ and AZ1117-ADJ. By type, the board carries 47 capacitors, 29 resistors, 17 test points, 13 connectors, 8 ICs and 5 diodes.
It belongs with the robotics & motion designs in this gallery.
From the project
Developing quadcopter from scratch including stm32 programing and self-built flight controller PCB.
Detailed Specification: - MCU - STM32F722RET6 - Interial Measurement Unit (IMU) - ICM-42688-P - Barometer - BMP388 - On-screen Display chip (OSD) - AT7456E - SPI FLASH - W25Q256JVEIQ (256 Mbit QUAD SPI NOR FLASH) - 9 V -- 2A Buck Converter - TPS54335ADRCR - 5V -- 2A Buck Converter - TPS54335ADRCR - 3.3 V -- 700 mA LDO - AZ1117-3.3
This flight controller is directly flashable and configurale via BetaFlight. Make sure to flash the FC with custom CLI file named "IRS_CLI". There is a official tutorial on youtube on how to flash a custom flight controller with a custom cli file.
Main components on the Flight Controller
Flight Controller bill of materials (BOM)
127 components, 65 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ICM-42688-P | ICP-42688-P | U1 |
| 1 | AT7456E | SOP65P637X110-28N | U2 |
| 1 | BMP388 | BMP388 | U3 |
| 1 | W25Q256JVEIQ Winbond Electronics | SON127P600X800X80-9N | U4 |
| 1 | AZ1117-ADJ | SOT-223-3_TabPin2 | U5 |
| 2 | TPS54335ADRCR | TPS54335ADRCR | U6, U7 |
| 1 | STM32F722RET6 | LQFP-64_10x10mm_P0.5mm | U8 |
| 1 | DMG3415 | SOT-23 | Q1 |
| 1 | 27MHZ 27MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 8MHZ 8Mhz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 4 | CONN_01X03 Conn_01x03 | JST_SH_SM03B-SRSS-TB_1x03-1MP_P1.00mm_Horizontal | J1, J2, J3, J4 |
| 1 | FC-ESC | JST_SH_SM08B-SRSS-TB_1x08-1MP_P1.00mm_Horizontal | J5 |
| 3 | CONN_01X04 Conn_01x04 | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J6, J10, J11 |
| 1 | DJI Air Unit | JST_SH_SM06B-SRSS-TB_1x06-1MP_P1.00mm_Horizontal | J7 |
| 2 | CONN_01X06 Conn_01x06 | JST_SH_SM06B-SRSS-TB_1x06-1MP_P1.00mm_Horizontal | J8, J12 |
| 1 | TC2030-IDC-NL | Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J9 |
| 1 | USB_C_PLUG_USB2.0 USB_C_Plug_USB2.0 | USB4110GFA | P1 |
| 1 | NRST | SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | SW_SPDT | SSSS810701 | SW1 |
| 1 | GTX | Solderable Point | TP1 |
Show 45 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | DJI_TX | Solderable Point | TP2 |
| 1 | GRX | Solderable Point | TP3 |
| 1 | DJI_RX | Solderable Point | TP4 |
| 8 | G | Solderable Point | TP5, TP6, TP8, TP10, TP18, TP19, TP20, TP21 |
| 2 | 3.3V | Solderable Point | TP11, TP12 |
| 1 | 5V | Solderable Point | TP13 |
| 2 | 9V | Solderable Point | TP15, TP16 |
| 1 | RB088LAM-40TFR | D_SOD-123 | D1 |
| 1 | PRTR5V0U2X | SOT-143 | D2 |
| 3 | LED | LED_0402_1005Metric | D3, D4, D5 |
| 1 | 120R | R_0603_1608Metric | FB1 |
| 1 | 3u2, IDC 5.4A | MDE0530-6R8M | L1 |
| 1 | 2u7, IDC 4A | MDE0530-6R8M | L2 |
| 2 | 10P 10p | C_0201_0603Metric | C1, C2 |
| 12 | 100N 100n | C_0201_0603Metric | C3, C6, C9, C11, C12, C13, C39, C40 +4 |
| 2 | 0.1U 0.1u | C_0402_1005Metric | C4, C43 |
| 2 | 22U 22u | C_0201_0603Metric | C5, C8 |
| 2 | 2U2 2u2 | C_0603_1608Metric | C7, C47 |
| 1 | 10N 10n | C_0201_0603Metric | C10 |
| 5 | 100N 100n | C_0402_1005Metric | C14, C20, C21, C23, C24 |
| 5 | 10U 10u | C_0805_2012Metric | C15, C16, C17, C18, C19 |
| 1 | 22U 22u | C_0805_2012Metric | C22 |
| 2 | 91P 91p | C_0201_0603Metric | C25, C26 |
| 2 | 1N8 1n8 | C_0603_1608Metric | C27, C28 |
| 5 | 47U 47u | C_1210_3225Metric | C29, C30, C31, C32, C33 |
| 2 | 10P 10p | C_0402_1005Metric | C34, C35 |
| 1 | 4U7 4u7 | C_0603_1608Metric | C36 |
| 1 | 10U 10u | C_0402_1005Metric | C37 |
| 2 | 1u | C_0402_1005Metric | C38, C44 |
| 2 | 75R | R_0201_0603Metric | R1, R3 |
| 3 | 10K | R_0201_0603Metric | R2, R8, R24 |
| 2 | 0R | R_0201_0603Metric | R4, R5 |
| 2 | 4K7 | R_0201_0603Metric | R6, R7 |
| 2 | 5K1 | R_0201_0603Metric | R9, R10 |
| 2 | 27R | R_0201_0603Metric | R11, R12 |
| 3 | 550R | R_0402_1005Metric | R13, R14, R29 |
| 2 | 31K | R_0402_1005Metric | R15, R16 |
| 3 | 10K | R_0402_1005Metric | R17, R18, R26 |
| 1 | 100K | R_0402_1005Metric | R19 |
| 1 | 9K7 | R_0402_1005Metric | R20 |
| 2 | 100K | R_0201_0603Metric | R21, R28 |
| 1 | 19K1 | R_0201_0603Metric | R22 |
| 1 | 0R | R_0402_1005Metric | R23 |
| 1 | 1K | R_0201_0603Metric | R25 |
| 1 | 330R | R_0603_1608Metric | R27 |
Flight Controller design files
The KiCad project lives in the LongDo1902/STM32_Drone repository on GitHub; these links point at the commit this page was built from.
Flight Controller: common questions
What microcontroller does the Flight Controller use?
The Flight Controller is built around the STM32F722RET6, from the STM32 family.
How big is the Flight Controller PCB?
The Flight Controller measures 38.5 × 38.5 mm, has 8 copper layers and is 1.70208 mm thick.
How many components are on the Flight Controller?
127 components, from 65 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Flight Controller design files?
From the LongDo1902/STM32_Drone repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Flight Controller design in my own project?
The repository has no license, so all rights stay with LongDo1902. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Flight Controller without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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