4 layers100 × 74 mm
Beaglelogic standalone
abhishek-kakkar/beaglelogic-standalone
BeagleLogic implemented as a turnkey and standalone logic analyzer
260 parts15
2 layers68.6 × 53.3 mm
A HAT designed for the AdaFruit Metro ESP32-S3 to communicate with Dynamixel servos using this library
- Size
- 68.6 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 38
- Pads
- 92
- Tracks, vias
- 118, 16
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 16 Jan 2025
- Updated
- 17 Jan 2025
Overview
Tophat is an open-source printed circuit board by dbd, from the dbd/AdafruitMetroESP32-DynamixelHat repository on GitHub. It is a 2-layer board of 68.6 × 53.3 mm with 26 parts on 38 nets, routed with 118 tracks and 16 vias.
It is built around the 74LVC2G241GS and TXB0104PW. Its parts include 7 capacitors, 7 connectors, 4 resistors and 2 ICs.
Main components
2
74LVC2G241GS
XSON-8(1x1.4)-40℃~+125℃ 1 1.65V~5.5V 2 2.6ns@3.3V,50pF 32mA 32mA 4uA 74LVC Power-off isolation、Output enable、Level shifting Schmitt trigger Tri-State Unidirectional XSON-8(1x1.4) Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
TXB0104PW
TSSOP-14-40℃~+85℃ 1 1.2V~3.6V 1.65V~5.5V 100Mbps 4 Auto Direction Detection Bidirectional CMOS CMOS Tri-State TSSOP-14 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
README
README.mdAdafruitMetroESP32-DynamixelHat
A HAT designed for the AdaFruit Metro ESP32-S3 to communicate with Dynamixel servos using this library
Bill of Materials
| Item | Link | Quantity | Unit Cost | Item Cost |
|---|---|---|---|---|
| TXB0104PWR Level Shifter | Link | 1 | $0.87 | $0.87 |
| SN74LVC2G241DCTR Tri-state buffer | Link | 1 | $0.40 | $0.40 |
| 10k Resistor | Link | 4 | $0.10 | $0.40 |
| 0.1 µF Capacitor | Link | 6 | $0.10 | $0.60 |
| 100 µF Capacitor | Link | 1 | $1.73 | $1.73 |
| JST Header | Link | 3 | $0.46 | $1.38 |
| 8P Header | Link | 2 | $1.42 | $2.84 |
| 6P Header | Link | 1 | $1.80 | $1.80 |
| 10P Header | Link | 1 | $2.19 | $2.19 |
| PCB Fab | 5 | 2 | ~$20 | |
| Total Cost | $32.21 |
Assembly
Hand soldering this is not for the faint of heart. If you don't own a hotplate and solder paste I would recommend having your PCB fab doing all the SMD component assembly and then purchasing the 100 µF capacitor and headers to solder yourself. Otherwise all components are labeled and assuming your PCB has silk screen printing, it should just be matching footprints. A "cheap" hotplate can be found for ~$55 on Amazon and should be sufficient with some cheap solder paste in a syringe to go along.
If the JST connectors don't match the footprint, try inserting them the otherway. Incorrectly soldering them shouldn't cause harm since the 12v line is in the middele regardless but I don't recommend finding out.
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | .1uf | digikey-footprints:0805 | C1, C2, C4, C5, C6, C7 |
| 4 | 10k | digikey-footprints:0805 | R1, R2, R3, R4 |
| 4 | MountingHole_3.2mm | Arduino_MountingHole:MountingHole_3.2mm | MH1, MH2, MH3, MH4 |
| 3 | Conn_01x03_Socket | Connector_JST:JST_EH_B3B-EH-A_1x03_P2.50mm_Vertical | J5, J6, J7 |
| 1 | 74LVC2G241 | Package_SO:MSOP-8_3x3mm_P0.65mm | U1 |
| 1 | Analog | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | C | Capacitor_SMD:CP_Elec_8x6.2 | C3 |
| 1 | Digital/PWM | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J2 |
| 1 | Digital/PWM | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J4 |
| 1 | Power | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Tactile_SPST_NO_Straight_CK_PTS636Sx25SMTRLFS | RST1 |
| 1 | TXB0104PW | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U2 |
| 1 | TestPoint_Probe | TestPoint:TestPoint_Pad_1.0x1.0mm | GND1 |
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Questions
How big is the Tophat PCB?
It measures 68.6 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Tophat use?
26 parts, built around the 74LVC2G241GS and TXB0104PW. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Tophat KiCad files?
From the dbd/AdafruitMetroESP32-DynamixelHat repository on GitHub, at the commit this page was made from: the board is tophat.kicad_pcb and its schematic tophat.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tophat design in my own project?
Its repository states no licence, so its author keeps all rights: ask dbd before reusing the design.