Taken from: http://ebrombaugh.studionebula.com/embedded/stm32f030breakout/index.html

pressure and valve controller shield

Planar coil setup for ferrofluid droplet manipulation

This is the PCB that I designed as part of the course from Tech Explorations

SumoCHIP Version 1.1 https://github.com/laurivosandi/sumochip

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

CATS PCB

This is a corrected file for the 3 axcon

Ghetto PoE 5V v0.1

A board designed to take 5v from a micro USB connector and send it down a CAT5/CAT6 cable for breakout and use at the remote end.

The board sends power down all 4 pairs, so the current carrying capacity is maximised, and should be good for around 500mA. Note that voltage drop will be an issue over long cable runs.

The BOM is pretty basic:

• An RJ45 port, with LEDs (of which only the right, green, one is used to indicate power). I’ve used the Amphenol RJHS-4081.

• Micro USB PCB mount connector. I use cheapos from aliexpress.

• A current limiting 0603 resistor for the LED - I’m using a 1.5K to keep power use down.

• A 1206 0.5A hold current, 1A trip current resettable fuse. I’m using Littelfuse 1206L050YR.

USE THIS VERSION INSTEAD: https://oshpark.com/shared_projects/kHW2ONDo

Buzz FPV electronics

patch 5.8

Schematic and Bill of materials at: https://github.com/mike-rankin/3.3v-5v_0.95inch_SPI_Color_Oled

Grab the shared PCB from OSHPark at https://www.oshpark.com/shared_projects/Vlc5MLaO

Reach me at @mikerankin for any questions or comments

V1a breaks out PA15 and changes the 32kHz crystal to a larger and cheaper ABS6.

An STM32L4 microcontroller in a Teensy form factor. This board was designed as a 2-layer PCB with all components on the top side as a more cost-effective, very low power Cortex M4 alternative. Design inspired by Kris Winer’s Dragonfly and Paul Stoffregen’s Teensy.

Includes both low-speed and high-speed oscillators, a supercapacitor RTC backup, an extremely low Iq LDO regulator, and flash memory. The supercapacitor’s VBAT pin is broken out such that an external coin cell or supercapacitor may be used.