Climate control project
Sensors in the project
- Board temperature
- Air temperature
- Air humidity
- Heater temperature
Devices in the project
- Cooler of board
- Heater
- Fan or Air extraction
- Humidifier
- Fuse
The project is based on the board Wemos D1 mini with the ESP8266 chip. It's a board like Arduino, but more small and powerful with WiFi system inside. Project definitions:
- SelfTemp - sensor for board temperature control.
- AirHum, AirTemp - module for air temperature and humidity in the house.
- HeatTemp - sensor to control the heater temperature.
- SelfFan - operate with cooler of board.
- AirHeat - operate with heater.
- AirFan - operate with fan.
- AirHumid - operate with humidifier.
- FuseHeat - operate with fuse.
Attention! This is a typical schema and can be changed as you decide. It's not necessary to use all components!
Project component list
| # | Marking | Amt | Type | Model | Description |
|---|---|---|---|---|---|
 |
U1 | 1 pc | Module | WeMos D1 mini | WiFi board with 4MB flash based on ESP-8266EX |
 | BME280 | 1 pc | Module | BME280 I2C | Temperature Humidity Pressure Sensor |
 | DS18B20 | 2 pc | Sensor | DS18B20 | 1-wire digital temperature sensor, TO-92 |
 | D1, D2, D3, D4, D5 | 5 pc | Diode | 1N4007 | 1000V 1A General Purpose Rectifier Diode, DO-41 |
 |
Q1, Q2, Q3, Q4, Q5 | 5 pc | Transistor | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 |
 |
R1 | 1 pc | Resistor | 4K7 | Resistor 0.25W, THT, DIN 0207 |
| R2, R3, R4, R5, R6 | 5 pc | Resistor | 1K | Resistor 0.25W, THT, DIN 0207 |
 | K1, K2, K3, K4 | 4 pc | Relay | SRD-05VDC-SL-C | 10A Relay SPDT SANYOU SRD Series Form C |
 | J1 | 1 pc | Socket | MKDS 1,5/2-5.08 KF301-2P | Way Screw Terminal Block 17.5A 5.08mm |
 | J11, J12, J15, J16 | 4 pc | Socket | MKDS 1,5/3-5.08 KF301-3P | Way Screw Terminal Block 17.5A 5.08mm |
 | J8 | 1 pc | Socket | B2B-XH-A(LF)(SN) | JST XH Series P2.5 mm |
 | J3, J4 | 2 pc | Socket | B3B-XH-A(LF)(SN) | JST XH Series P2.5 mm |
 | J2 | 1 pc | Socket | B4B-XH-A(LF)(SN) | JST XH Series P2.5 mm |
 | optional | ? | Relay | SSR-40 DA | Solid silent relay |
 | optional | ? | Power supply | HLK-PM01 | AC-DC 220V to 5V |
 | optional | ? | Cooler | MX-3010 | Radial fan 30x30x10mm, 5В 150мА |
Danger! The relay of the device operates with a high voltage circuit, be careful!
Useful and smart! These PCB components are optional to use. For example, in one way you can use digital pins for your relay module, or in another way, you can put on board all components and make a complete product. The board has additional pins like 5V, 3.3V, GND for outside modules.
The SelfTemp sensor may be placed right on board without sockets.
There is a high voltage zone on the PCB. It is necessary to solder well all wires from the relay.
You need to connect the fuse on the wire path before all other devices. A fuse can cut off the circuit and save the heater from overheating in case of a broken relay situation.
Board's box
Socket cover of the heater
Box for BME280
Fan adapter
