4 layers60 × 75 mm
Mixed Signal Demo PCB
rcardenes/FEDEVEL-Mixed-Signal-PCB
KiCAD files for the Mixed-Signal Hardware Design course at Fedevel, by Phil Salmony
114 parts2
4 layers60.6 × 56.2 mm
Furnace controller
digiexchris/furnace-controllerSimple 5 wire furnace controller using the Wemos D1 Mini. Intended for ESPHome and Home Assistant or other automation uses.
- Size
- 60.6 × 56.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 48
- Pads
- 131
- Tracks, vias
- 168, 25
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 20 Jun 2023
- Updated
- 2 Mar 2024
Overview
Furnace controller is an open-source printed circuit board by digiexchris, from the digiexchris/furnace-controller repository on GitHub. It is a 4-layer board of 60.6 × 56.2 mm with 40 parts on 48 nets, routed with 168 tracks and 25 vias.
It is built around the XL1509-5.0, SS14 and 0805W8F100J, with the 0805W8F1500, 0805W8F4700 and MMBT3904 among its other parts. Its parts include 11 diodes, 9 resistors, 3 capacitors, 3 transistors and 3 switches. It belongs with the home automation and IoT boards and the ESP32 boards of this library.
Main components
12
XL1509-5.0
SOIC-8-40℃~+125℃ 1 150kHz 2A 2mA 4.5V~40V 5V Buck Buck Built-in Fixed No SOIC-8 DC-DC Converters ROHSUMWDC-DC Converters
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
0805W8F100J
0805-55℃~+155℃ 10Ω 125mW 150V Thick Film Resistor ±1% ±200ppm/℃ 0805 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount0805W8F1500
0805-55℃~+155℃ 125mW 150V 150Ω Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount0805W8F4700
0805-55℃~+155℃ 125mW 150V 470Ω Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
UMS05-1A80-75L
SIP,3.6x6.9mm-20℃~+85℃ 1 Set Normally Open: 1A (SPST NO) 100us 170V@AC、170V@DC 200us 500mA 5V SIP,3.6x6.9mm Reed Relays ROHSSTANDEXMEDERReed Relays
EEEHAE221UAP
SMD,D8xL10.2mm-40℃~+105℃ 10.2mm 1000hrs@105℃ 160mA@120Hz 220uF 25V 8mm Polarized ±20% SMD,D8xL10.2mm Aluminum Electrolytic Capacitors - SMD ROHSPanasonicAluminum Electrolytic Capacitors - SMD
CL31B105KBHNNNE
12061uF 50V X7R ±10% 1206 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
EEEFN1V561UP
SMD,D10xL10.2mm-55℃~+105℃ 2000hrs@105℃ 35V 560uF 80mΩ@100kHz 850mA@100kHz Polarized ±20% SMD,D10xL10.2mm Aluminum Electrolytic Capacitors - SMD ROHSPanasonicAluminum Electrolytic Capacitors - SMD
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
SM1054-680MT
SMD,10x9mm1.11A 1.5A 220mΩ 68uH Unshielded Inductor ±20% SMD,10x9mm Power Inductors ROHSSXNPower Inductors
README
README.md
furnace-controller
Simple 5 wire furnace controller using the Lotlin S2 Mini. Intended for ESPHome and Home Assistant or other automation uses.
Why this exists
It's difficult to find a power supply to run an esp32 or esp8266 (or any 5vdc device for that matter) off of the 24vac transformer typically used in a furnace. This is intended to provide power and 3 relays connected to an esp8266 so that it can run anywhere that the thermostat wires are run in your house (or, as in my case, mounted directly to the furnace cabinet).
Deets
- Accepts AC or DC input power, up to about 30V maximum. It's possible that it will accept up to 42v, but I have not tested it at that level, and you very likely will let the smoke out. Check the specs on the DC-DC IC for more info.
- 5A Relays, up to 30VDC or 250VAC contacts.
- Avoids most of the multipurpose pins on the lotlin S2 mini, so you can use them for something else.
- Provides das blinken lighten for telling you if the furnace should be on
Pinout
| Function | Esp32-S2 Pin |
|---|---|
| Heat | IO35 |
| Cool | IO18 |
| Fan | IO33 |
| WIFI Led | IO09 |
| Status LED | IO05 |
I WANT ONE!
You have a few options:
- whack together one using whatever you have on hand using the schematic (see the kicad project, Kicad 8.0 btw.)
- Shoot me an email at chris@voiditswarranty.com, or see VoidItsWarranty.com, and ask me to make one for you
- Have a board house like jlcpcb make you one. The kicad folder contains the production files used for my first few.
Example ESPHome config
See furnace-controller.yaml in the root of this project for an example ESPHome config. Once it's up and running in ESPHome, you can use it as a normal set of switches for your thermostat, or any other automation that the relays can support.
FAQ
- Q: The LEDs are too bright! A: yup, sorry about that
- Q: Will it work on my furnace? A: no idea. Probably, if it's a standard 3-5 wire thermostat and the control circuitry is 24VAC.
- Q: I don't like it. A: Neither does my carpal tunnel.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4 |
| 4 | SS14 | PCM_Diode_SMD_AKL:D_SMA | D11, D12, D13, D15 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2k1, R19, R21 |
| 3 | 2k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R14, R17 |
| 3 | 470 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15, R16, R18 |
| 3 | MMBT3904 | PCM_Package_TO_SOT_SMD_AKL:SOT-23_BigPads | Q3, Q4, Q5 |
| 3 | UMS05-1A80-75L | Relay_THT:Relay_SPST_TE_PCN-1xxD3MHZ | K1, K2, K5 |
| 1 | 180uf 20v | Capacitor_SMD:CP_Elec_8x10.5 | C6 |
| 1 | 1uf 50v | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C5 |
| 1 | 470uf 35v | Capacitor_SMD:CP_Elec_10x10.5 | C2 |
| 1 | 5v | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | 68uh 2a | Inductor_SMD:L_10.4x10.4_H4.8 | L1 |
| 1 | COOL | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D10 |
| 1 | FAN | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | HEAT | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
| 1 | Jumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP2 |
| 1 | Jumper_2_Bridged | Jumper:SolderJumper-3_P1.3mm_Bridged2Bar12_Pad1.0x1.5mm | JP1 |
| 1 | LOGO | footprints:ivoidwarranties | G*** |
| 1 | MB10S | PCM_Diode_SMD_Handsoldering_AKL:Diode_Bridge_MBS | D4 |
| 1 | STATUS | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D5 |
| 1 | Screw_Terminal_01x06 | TerminalBlock:TerminalBlock_bornier-6_P5.08mm | J1 |
| 1 | WIFI | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D14 |
| 1 | XL1509-5.0 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.81mm | U1 |
| 1 | mini_esp32 | ESP32_mini:ESP32_lotlin_mini | U2 |
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Questions
How big is the Furnace controller PCB?
It measures 60.6 × 56.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Furnace controller use?
40 parts, built around the XL1509-5.0, SS14, 0805W8F100J and 0805W8F1500. 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 Furnace controller KiCad files?
From the digiexchris/furnace-controller repository on GitHub, at the commit this page was made from: the board is kicad/furnace controller.kicad_pcb and its schematic kicad/MCU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Furnace controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask digiexchris before reusing the design.