DropBear
About the DropBear PCB
DropBear is an open source ESP32 PCB design by speeduino, published on GitHub. It is a 2-layer board measuring 116.1 × 98 mm, with 196 components from 60 distinct parts.
Its main chip is the IXDN602SIATR, from the ESP32 family. Other key parts include the MAX9926UAEE/V+, ZXMS6006DT8, VNLD5090-E, MCP2562-E/SN and W25Q32JVSSIQ. By type, the board carries 75 resistors, 43 diodes, 39 capacitors, 20 ICs, 5 jumpers and 5 switches.
From the project
Official Speeduino hardware designs
These resellers all contribute a portion of sales back to the project to allow for continued development to take place and we encourage sales through them whenever possible.
Of course, being open source, you are free to use the design files provided here to create your own hardware!
This project exists thanks to all the people who contribute, both in terms of code and testing provided. If you'd like to get involved, please have a read through Contributing and then jump on Discord to discuss things further
Main components on the DropBear
DropBear bill of materials (BOM)
196 components, 60 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MAX9926UAEE/V+ MAX9926UAEE_V+ | QSOP-16_3.9x4.9mm_P0.635mm | IC1 |
| 4 | ZXMS6006DT8 | Diodes_SM8 | IC2, IC3, IC4, IC5 |
| 1 | VNLD5090-E Teensy4.1 | Teensy41 | U1 |
| 1 | MCP2562-E/SN MCP2562-E-SN | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | W25Q32JVSSIQ W25Q32JVSS | SOIC-8_5.23x5.23mm_P1.27mm | U3 |
| 1 | IXDN602SIATR ~ | ESP32-C3 SUPERMINI | U4 |
| 4 | TC4424AVOA TC4424A | SOIC-8_3.9x4.9mm_P1.27mm | U5, U6, U9, U10 |
| 2 | MCZ33810EK MC33810 | SOIC32-P0.65-33N | U7, U8 |
| 1 | KP234XTMA1 KP234 | KP234 | U11 |
| 2 | LMV324LIDT | SOIC-14_3.9x8.7mm_P1.27mm | U12, U14 |
| 1 | SP720ABTG SP720 | SOIC-16_3.9x9.9mm_P1.27mm | U13 |
| 1 | NCV7805BDTRKG MC78M05_TO252 | TO-252-2 | U15 |
| 1 | Pololu_Breakout_DRV8825 | Pololu_Breakout-16_15.2x20.3mm | A1 |
| 2 | NVJD5121NT1G Q_DUAL_NMOS_S1G1D2S2G2D1 | SOT-363_SC-70-6 | Q2, Q3 |
| 1 | Delphi_Sicma_24 | Delphi_Sicma_24_Grey | J1 |
| 1 | Delphi_Sicma_24 | Delphi_Sicma_24_Black | J2 |
| 1 | EBC05DRXN | EBC05DRXN | J3 |
| 1 | 500 Battery_Cell | BatteryHolder_Keystone_500 | BT1 |
| 1 | 0ZCC0050FF2C Polyfuse | Fuse_1812_4532Metric | F1 |
| 1 | 0ZCM0008FF2G Polyfuse | Fuse_0603_1608Metric | F2 |
Show 40 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | M20-9990345 SolderJumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP1 |
| 1 | M20-9990345 Jumper_NO_Small | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | M20-9990345 Jumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP3 |
| 2 | M20-9990245 Jumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP4, JP5 |
| 4 | AYZ0202AGRLC SW_DPDT_x2 | AYZ0202AGRLC | SW1, SW2, SW4, SW5 |
| 1 | IKN0204000 SW_DIP_x02 | SW_DIP_SPSTx02_Slide_9.78x7.26mm_W8.61mm_P2.54mm | SW3 |
| 2 | DFLS2100-7 D_Schottky | D_PowerDI-123 | D1, D32 |
| 8 | SML-H12D8TT86C LED | LED_0805_2012Metric | D2, D3, D4, D5, D22, D23, D24, D25 |
| 9 | LH R974-LP-1 LED | LED_0805_2012Metric | D6, D7, D8, D9, D18, D19, D20, D21 +1 |
| 15 | 1N4448WX-TP D | D_SOD-323 | D10, D11, D12, D13, D14, D15, D16, D17 +7 |
| 2 | D1213A-01T-7 D_TVS | D_SOD-523 | D26, D27 |
| 1 | PTVS20VS1UR,115 D_TVS | D_SOD-123F | D30 |
| 4 | LG R971-KN-1 LED | LED_0805_2012Metric | D31, D41, D42, D43 |
| 1 | SMBJ40A-Q D_TVS | D_SMB | D39 |
| 1 | B360A-13-F D_Schottky | D_SMA_Handsoldering | D40 |
| 13 | CC0805KRX7R9BB104 0.1uF | C_0805_2012Metric | C1, C2, C3, C9, C12, C13, C14, C21 +5 |
| 5 | CC0805KRX7R9BB103 0.01uF | C_0805_2012Metric | C4, C7, C20, C29, C30 |
| 2 | CC0805KRX7R9BB472 4700pF | C_0805_2012Metric | C5, C16 |
| 2 | C0805C102J5HACAUTO 1nF | C_0805_2012Metric | C6, C8 |
| 3 | CC0805KKX7R7BB105 1uF | C_0805_2012Metric | C10, C11, C23 |
| 2 | CC0805JRX7R7BB274 270nF | C_0805_2012Metric | C15, C19 |
| 5 | CL21B224KOCNNNC 0.22uF | C_0805_2012Metric | C17, C18, C24, C25, C28 |
| 1 | CL31A107MQHNNNE 100uF | C_1206_3216Metric | C27 |
| 1 | EEE-FT1V101AV 100uF | CP_Elec_6.3x7.7 | C31 |
| 2 | TAJB476K006RNJ 47uF | CP_EIA-3528-21_Kemet-B | C33, C35 |
| 2 | EEE-1HA330XP 33uF | CP_Elec_6.3x7.7 | C36, C37 |
| 1 | CGA4J2X7R1H334K125AA 0.33uF | C_0805_2012Metric | C39 |
| 7 | ERJ-6ENF4700V 470R | R_0805_2012Metric | R1, R31, R33, R34, R38, R39, R44 |
| 1 | RC0805JR-070RL 0R | R_0805_2012Metric | R3 |
| 1 | RC0805FR-07120RL 120R | R_0805_2012Metric | R4 |
| 33 | RC0805FR-071KL 1k | R_0805_2012Metric | R5, R6, R11, R12, R13, R14, R15, R16 +25 |
| 4 | RC1206FR-7W10KL 10k | R_1206_3216Metric | R7, R8, R9, R10 |
| 3 | RC0805JR-0710KL 10k | R_0805_2012Metric | R19, R20, R64 |
| 1 | RC0805FR-07604RL 604R | R_0805_2012Metric | R29 |
| 1 | RT0603BRD073K88L 3.88k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R30 |
| 1 | RC0805FR-072K4L 2.4k | R_0805_2012Metric | R32 |
| 3 | RT0805BRD072K49L 2.49k | R_0805_2012Metric | R36, R37, R74 |
| 6 | RC0805FR-07180KL 180k | R_0805_2012Metric | R40, R41, R45, R46, R50, R53 |
| 6 | ERJ-6ENF3483V 348k | R_0805_2012Metric | R42, R43, R47, R48, R51, R54 |
| 8 | RC0805FR-07100KL 100k | R_0805_2012Metric | R59, R60, R61, R62, R69, R70, R71, R72 |
DropBear design files
The KiCad project lives in the speeduino/Hardware repository on GitHub; these links point at the commit this page was built from.
DropBear: common questions
What microcontroller does the DropBear use?
The DropBear is built around the IXDN602SIATR, from the ESP32 family.
How big is the DropBear PCB?
The DropBear measures 116.1 × 98 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DropBear?
196 components, from 60 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 DropBear design files?
From the speeduino/Hardware 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 DropBear design in my own project?
The repository has no license, so all rights stay with speeduino. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the DropBear without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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