Partially assembled BrewPi-ESP32 "One Size Fits Most" PCB for the LoLin D32 Pro

This PCB was designed for the BrewPi-ESP32 project, and connects a Lolin D32 or D32 Pro to the BrewPi-ESP sensor breakout PCB and to a 5V 2-channel relay board. This board supports three options for connections to a screen, including:

• LCD2004 IIC board connected via the 4-pin "LCD" header
• LoLin D32 Pro TFT screen connected to a LoLin D32 Pro via the matching cable
• Generic ILI9341-driven TFT screen connected to the 10 pin box header with a matching cable & PCB

This PCB fits the screw holes on my generic BrewPi-ESP case base.

Overview

This PCB is part of the BrewPi-ESP project. The original BrewPi project is an open-source temperature controller for the purpose of controlling beer, mead, and wine fermentation temperatures incredibly accurately, using a small microcontroller (originally an Arduino), a relay, some temperature sensors, and a Raspberry Pi. This project reimplements the open source BrewPi firmware on both the ESP8266 and ESP32.

This PCB is designed to allow connecting an ESP32 to the other hardware necessary to run the BrewPi firmware and control fermentation temperatures for your brewery. This specific board was designed to use a LoLin D32 Pro ESP32 microcontroller and integrate with a 2-channel relay board and one of the screen options mentioned above. This PCB supports the use of dupont connectors for connecting the relay which allows for a very compact design. This PCB allows for the use of both SMD and TH components - though this build has been assembled using SMD components. This PCB also includes user-selectable OneWire voltage, enabling a broad range of temperature sensors.

This board does not have terminals for directly connecting temperature sensors - it is intended to be connected to a separate RJ-45 sensor board via an ethernet cable.

Bill of Materials, Documentation, and Build Instructions

This PCB comes partially assembled. Although the SMD components are already mounted, several of the TH components will require soldering.

To complete your BrewPi build you will need (not included) a Lolin D32 or D32 Pro, 5v 2A power supply, 5v 2-channel relay board, and the jumper that typically comes with that 5v 2-channel relay board. You will also need the requisite hardware for the screen depending on the option you select. You will also need a BrewPi-ESP sensor breakout board (with attached temperature sensors) and an ethernet cable to connect the sensor breakout board to this "main" PCB.

This board is compatible with my BrewPi-ESP case design. Be sure to select the "D32 Pro TFT" case lid when ordering.

Bill of Materials

This PCB includes all SMD components pre-soldered to the board. The specific pieces included from the original BoM include:

This bundle includes the following additional TH components which are required for use, but will need to be soldered on by you:

Enclosure

A complete build generally will interact with mains voltage, and therefore is intended to be in a case while in use. I have designed an enclosure that can be 3D printed which is available as an optional add-on to this item, or you can use a different enclosure of your choosing.