Shared Projects by hydrabus

TRL Board v0.3 (PCB 1.6mm) 4 Layers OSHPark For more details see GitHub 4Layers_trl-board_v0_3

This board is based on Mario Hellmich’s design see https://www.mariohellmich.de/projects/trl-cal/trl-cal.html

TRL Calibration Board for evaluation of Southwest Microwave 1092-02A-5(up to 40 GHz) or BELFUSE / Cinch 142-0771-831(Up to 26.5GHz) or cheap SMA connectors. 50 Ohms Impedance matched with OSHPark 4Layers FR408-HR

It contains following features:

• A thru standard for TRL

• A 50 Ohms match standard

• A 25 Ohms mismatch standard for verification

• An open standard for verification

• A short standard, used as a reflect standard for TRL

• A line of 45 mm length (Called also “Line 76mm” to reflect total length), used as a line standard for TRL

• A series fixture for 0402 components

• A shunt fixture for 0402 components

The board is designed assuming the following parameters (based on OSH Park 4 Layers 190Tg FR408-HR specifications):

• Base Material / Board thickness: 1.6 mm (63 mil)

• Conductor Height 0.17mm FR408-HR

• Center Conductor Width: 0.36 mm (14.17 mil)

• Gap Width: 0.25 mm (9.84 mil)

• Permittivity: FR408-HR 3.66 (3.68 @2GHz)

• Loss Tangent: 0.0092 @2GHz

• Copper Weight: 1oz outer (35µm), 1/2oz inner (17.5µm)

• Trace surface: Cu + ENIG

• Impedance: 50 Ohms (+/-2 Ohms)

• PCB Finish: ENIG (Gold)

This Board is based on trl-cal Mario Hellmich’s design

See project OSHPark_4Layers_trl-board_v0_1 with KiCad files on GitHub

sma-probetarget_oshpark_bve_v0_4_16Feb2020

This version use SMA Connectors (up to 26.5GHz) BELFUSE 142-0771-831

Link: https://belfuse.com/product/part-details?partn=142-0771-831

HydraBus v1.0 Shield for ESP-WROOM-32/ESP-32S V1.1 Rev1.0

HydraBus Shield / Breakout board for ESP-WROOM-32 or ESP-32S.

This shield can be used with or without HydraBus board, you can even cut HydraBus specific right side (on the line) to have a tiny ESP-WROOM-32 breakout board.

It is not mandatory to solder the components on this shield in order to use it, you will just need to connect +3v3 on VCC Pin header

• New features versus previous version V1.0 Rev1.1:

  • Added LDO (TPS73633DBVR SOT23-5) to convert 5V(VUSB) to a clean VCC (+3.3v) for ESP32 and which can be enabled by an HydraBus Pin or with a JUMPER on J7 (which connect +3.3V from HydraBus to EN of the LDO)
  • Added VCC connector in order to measure ESP32 current/power consumption (if not used to measure current just add a JUMPER on VCC to power the ESP32)
  • Added J6 connector to have access to ESP32 SPI FLASH IOs (now all pins are available)

• This shield can be used only on bottom of HydraBus board (in order to use other shields on top of HydraBus)

• The HydraBus board is a small (60mm x 37mm) and low cost, multi-tool extensible board with STM32F405 Cortex M4F 32bits MCU @168MHz with a fully open source firmware hydrafw and full online documentation hydrafw wiki

• The ESP-WROOM-32 is a low-power 32-bit 240 MHz dual core MCU Wi- Fi+BLE combo module that highly integrates TCP/IP network stacks, 12- bit ADC and HSPI/SDIO/UART/PWM/I2C/I2S interfaces. See ESP32 Overview, ESP-WROOM-32 link/info, Espressif Products Overview including ESP-WROOM-32 PDF

• Design based on official esp_wroom_32_datasheet_en.pdf (September 26, 2016)

BOM:

Note1: LDO U2 can be also replaced by MIC5319-3.3YD5-TR (Microchip)

Note2: If you do not want to solder those components you can avoid them and directly connect HydraBus 3v3 to VCC Pin near J5 marking

Tested with success with an ESP-32S Module from Ai-Thinker (it is recommended to use official Espressif ESP-WROOM-32)

For more details see the project on GitHub hydraESP32