2 layers51.3 × 105 mm
Zynface V5
zynthian/zynthian-hw
Zynthian hardware stuff: PCBs, schemes, parts specifications, pin assignment, ...
26 parts156
2 layers114.9 × 100 mm
WaterMixer
guttih/WaterMixer1Using Esp32 to mix water temperature
- Size
- 114.9 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 22
- Pads
- 142
- Tracks, vias
- 217, 6
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Jun 2021
- Updated
- 4 Jun 2023
Overview
WaterMixer is an open-source printed circuit board by guttih, from the guttih/WaterMixer repository on GitHub. It is a 2-layer board of 114.9 × 100 mm with 20 parts on 22 nets, routed with 217 tracks and 6 vias.
It is built around the ESP32-DEVKITC-VE, MCP4728-E/UN and ADS1115. Its parts include 7 ICs, 3 capacitors and 1 resistor. It belongs with the ESP32 boards of this library.
Main components
3
ESP32-DEVKITC-VE
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
MCP4728-E/UN
MSOP-10-40℃~+125℃ 12 2.7V~5.5V 2LSB 4 40nA 6us I2C Integrated buffer、Power-on reset、Power-down mode、Programmable gain Voltage Buffer MSOP-10 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)ADS1115
UncategorisedTexas Instruments
README
README.mdWater Mixer
This project mixes water temperature from a 1/2" hot water pipe and a 1/2" cold water pipe out to a single 3/4" output water pipe. A electrical valve controls the flow from the hot water pipe and another electrical valve controls the cold water pipe. A Temperature sensor is put into the 3/4" output water pipe to sense the current heat of the outgoing water. Finally the third electrical valve is used to drain the hot tub.
Related links
- Project page (todo:)
- Experiment page
- Hot-tub
- Project Development documents
Parts in project
- 1 x 12V Power supply
- 2 x DC_STEPDOWN
- 1 x ESP32 Development Board
- 1 x DS18B20 Digital Temperature Sensor G3/4
- 1 x Logic level converter
- 1 x Dac MCP4728
- 3 x Proportional Valve Brass controllable with 0-5V
- 1 x LCD touch display
Api
Supported methods, requests and responses are described in the API methods
Wiring the project
Schematic
+12V
┬
┌───────────────────────────────────────────────────────────────────────────────────────┤
│ ┌───────────────────┬──────────────────┬────────────────┬───────────────────────┬──┐ │
│ │ │ │ ╔══════════╗ │ ╔═════════════╗ ┴ │ │
│ │ ╔══════════════╗ │ ╔═════════════╗ │ ║ Pressure ║ │ ║ ADC ║ GND │ │
│ │ ║ POWER SOURCE ║ │ ║ DC_STEPDOWN ║ │ ║ Sensor ║ │ ║ ADS1115 ║ │ │
│ │ ║ ║ │ ║ -Vo(GND) -╟─┘ ║ ║ │ ║ ║ │ │
│ │ ║ ║ │ ║ +Vo(+5V) -╟─┐ ║ Black-╟──┴──╢-G ║ │ │
│ │ ║ ║ │ ║ ║ │ ║ Green-╟─────╢-A0 ║ │ │
│ └─╢- GND -╟──┴──╢-GND ║ │ ║ ║ ╢-A1 ║ │ │
└───╢- +12V -╟─────╢-VIN ║ │ ║ ║ ╢-A2 ║ │ │
╚══════════════╝ ╚═════════════╝ │ ║ ║ ╢-A3 ║ │ │
│ ║ Red-╟─┬───╢-V ║ │ │
+5V │ ╚══════════╝ │ ┌─╢-CL DA-╟─┐ │ │
┬ ┌────────────────┴───────────────┘ │ ╚═════════════╝ │ │ │
└──┤ │ │ │ │
│ ╔═══════════╗ │ ╔═════════════╗ │ │ │
│ ║ -ESP32- ║ ╔═════════════╗ │ ║ DAC ║ │ │ │
│ ║ ║ ║ Logic Level ║ │ ║ MCP4728 ║ │ │ │
│ ║ ║ ║ converter ║ │ ║ ║ │ │ │
└─╢-VIN G14-╟──╢-LV3 HV3-╟───┴─╢-CL ║ │ │ │
║ G13-╟──╢-LV4 HV4-╟─────╢-DA───────DA-╟─┘ │ │
+3V3 ╔═══════════╗ ║ ║ ║ ║ ║ ║ │ │Legend
- (BL) = Black wire (-Ground)
- (RD) = Red wire (+VCC)
- (YE) = Yellow wire
- (GR) = Green wire (voltage signal)
- (WT) = White wire
- GND : Ground.
┴GND: Ground. When there is no room to connect the GND on the drawing, this notation is used. Note, all grounds are connected together.- VIN : 5V pin on the esp32 pin.
- G34 : Esp32 GPIO 34 pin which is used to measure voltage coming from pressure sensor.
- G25 : Esp32 GPIO 25 pin which is used to communicate with the temperature sensor.
- G12 : Esp32 GPIO 12 pin which is used control the hot water valve.
- G14 : Esp32 GPIO 14 pin which is used control the cold water valve.
- G32 : Esp32 GPIO 32 pin which is used control the drain water valve.
- G## : Other esp32 pins used to control the touch display and read and write to a sd card.
- Valve H: Hot valve
- Valve C: Cold valve
- Valve D: Drain valve
Software development
The software for this project was developed using PlatformIO.
Tests
There are two kinds of tests in this project, integration tests and unit tests.
Integration tests:
integration tests are located in the ./test directory.
On windows 10, best would be if you would add this location to your PATH system environment variable C:\Users\your_user_name.platformio\penv\Scripts to get access to the pio.exe application.
C:\Users\gudjons.platformio\penv\Scripts
Then you can run the tests with this command pio test
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | watermixer-footprints:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 470uF | Capacitor_THT:CP_Radial_Tantal_D8.0mm_P5.00mm | C1, C2, C3 |
| 2 | SD_BUCK3A | watermixer-footprints:SD_BUCK3A | U6, U7 |
| 1 | 01x03 | watermixer-footprints:Screw_Termianl_01x03 | JD_VALVE1 |
| 1 | 01x06 | watermixer-footprints:Screw_Termianl_01x06 | JHC_VALVES1 |
| 1 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | ADS1115 | watermixer-footprints:ADS1115_module | U5 |
| 1 | Barrel_Jack | watermixer-footprints:Barrel_Jack | J_12V1 |
| 1 | CR2013-MI2120-touch | watermixer-footprints:CR2013-MI2120_touch | U1 |
| 1 | ESP32-DevKitC | Espressif:ESP32-DevKitC | U2 |
| 1 | LLC_4CH | watermixer-footprints:LLC_4CH | U3 |
| 1 | MCP4728 | watermixer-footprints:MCP4728_module | U4 |
| 1 | Pressure sensor | watermixer-footprints:Screw_Termianl_01x03 | JPress1 |
| 1 | Temperature sensor | watermixer-footprints:Screw_Termianl_01x03 | JTemp1 |
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Questions
How big is the WaterMixer PCB?
It measures 114.9 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the WaterMixer use?
20 parts, built around the ESP32-DEVKITC-VE, MCP4728-E/UN and ADS1115. 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 WaterMixer KiCad files?
From the guttih/WaterMixer repository on GitHub, at the commit this page was made from: the board is hardware/KiCad/watermixer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the WaterMixer design in my own project?
Its repository states no licence, so its author keeps all rights: ask guttih before reusing the design.