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The HomeBrew Gen3 (HBG3) Parts List

Here are some of the parts that are used for building variations of the HBG3.

Standard Parts Included In the Kit

  • The HomeBrew Gen3 Printed Circuit Board (PCB) with factory-soldered SMDs. Available from the author.

  • The 30-pin ESP32 DevKit-v1 processor module. Pay attention to the micro-USB connector: it should have mechanical through-hole attachment points, rather than 100% surface-mount. Otherwise it is likely to break off with repeated use. Best to use one that does NOT have presoldered pin headers.
    AliExpress: https://www.aliexpress.com/item/1005001648850998.html (select the big module with pin headers, aka. "Color ESP32").

  • RJ12 6P6C (six position, six conductor) AUX connector.
    DigiKey: https://www.digikey.ca/en/products/detail/assmann-wsw-components/A-2004-1-4-N-R/2183626 (lots of similar ones exist).
    DigiKey: https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/5555980-1/769571

  • Nunchuck socket. Only one source seems to exist for these.
    AliExpress: https://www.aliexpress.com/item/1005003282079264.html (either "color").

  • White/red 0.96" OLED (not blue!), longer pins, button switch, and red filter:
    https://www.aliexpress.com/item/1005005488524947.html White OLED with pads in correct sequence.
    https://www.aliexpress.com/item/1005001514058091.html Longer pins needed for attaching OLED (choose 17mm version).
    https://www.aliexpress.com/item/1005004001434474.html Button switch for OLED menus.
    https://www.aliexpress.com/item/1005004727018639.html Red Gel filter material for OLED (choose Red).

  • Mini 3-pin 5V buck convertor. This miniature switching power supply converts 8-24V input (normally 12V) down to 5V, to power the ESP32 module and other components of the HBG3. It must be a buck converter, not a simple (hot!) linear regulator.
    AliExpress: https://www.aliexpress.com/item/33017156248.html (select the 5V version).

    These alternative buck converters from Digikey are electrically equivalent, but don't fit the newest PCBs as well as the AliExpress one above. Some pin/lead bending may be necessary.
    DigiKey: https://www.digikey.ca/en/products/detail/recom-power/R-78E5-0-0-5/2834904
    DigiKey: https://www.digikey.ca/en/products/detail/cui-inc/P78E05-1000/9649654
    DigiKey: https://www.digikey.ca/en/products/detail/cui-inc/VX7805-500/7350283

  • Two mini slide switches: one for MUSB/RF-Kill, the other for WiFi mode selection.
    AliExpress: https://www.aliexpress.com/item/1005003938407295.html (select SS-12D00G 5mm).

  • One extra long single pin header, or a length of stiff wire. This is used to connect the WiFi switch to the HBG3.

  • One 2-pin straight header for the MUSB switch.

  • A short length of 35mm round (50mm when flat) transparent heat-shrink tubing, for a simple "enclosure".
    Amazon: https://www.amazon.ca/gp/product/B07QT739BK/

  • A short AUX cable (not shown), with 6P6C connectors crimped on both ends. Best to buy a crimper plus connectors and crimp your own. Each end of the cable should have identical wire colour orders when viewed side by side.

    • Optional Extras For A Fancier Build

  • Beitian BN-180, BE-180, or BE-182 GPS Receiver Module with 4-wire serial interface. The BN-180 is the proven incumbent, but the BE-180/BE-182 are newer and faster.
    Amazon: https://www.amazon.ca/dp/B0BV2KMFGH/
    AliExpress: https://www.aliexpress.com/item/1005004405692761.html (select the BE-180).

  • 3D Printed enclosure instead of heat-shrink. Plans are available for a few different versions.
    Cloudy Nights: https://www.cloudynights.com/topic/854327-homebrew-gen3-pcb-wifibtgpsmusbrelay/page-13#entry12666971.

    • For The Smart Dew Heater Function

  • Here is a nice 3D-Printable case for Dew Control.

  • Sensor for ambient temperature and humidity. Best to get one with a molded housing and integrated cable assembly.
    SHT30 sensor: AliExpress: https://www.aliexpress.com/item/1005004067304781.html (select SHT30-White).

  • Opti-Coupled LR7843 MOSFETs: AliExpress: https://www.aliexpress.com/item/1005006372045900.html.

  • One ADS1115 Analog-to-Digital Converter (ADC) module. Amazon, or AliExpress: https://www.aliexpress.com/item/1005005649341536.html (either version).

  • 10K-ohm 0.1% (or 1.0% otherwise) Resistor for each thermistor:
    Best: 0.1% from DigiKey https://www.digikey.ca/en/products/detail/koa-speer-electronics-inc/MF1-4CCT52R1002B/21679704.
    Okay: 1.0% from AliExpress: https://www.aliexpress.com/item/1005001627995396.html.

  • Five additional 10K Resistors for (optional) Dew Heater Voltage measurement (same as above).

  • For Dew Controller wiring, see here. If doing this one in conjunction with the HBG3-Relay add-on, then two wires connect differently than shown. See this post for a description of the change needed.