Hardware setup

Hardware setup

Tools

Since these projects are involve some soldering I highly recommend to buy a soldering iron before starting assemble it! Personally I'm using a 10$ one from Aliexpress, but since I have to solder SMD parts for the PCBs I've ordered a Soldering station like in the picture 😄 Soldering Iron
Soldering Station 1
Soldering Station 2
Hot Air Soldering Gun

List of parts

Hot Air Soldering Gun

USB TTL adapter
NodeMCU or Wemos D1 Mini
Jumper cables

Water Leak Sensing cable
Water Sensing Cable 1
Water Sensing Cable 2

Connections

• Leak Sensor is connected to GPIO12and GND. If you are using Wemos D1 mini, GPIO12 is D6!

• Siren is connected to GPIO14 and GND. If you are using Wemos D1 mini, I2C pins are GPIO14 is D5!

• Red LEDs are connected to GPIO5 and GND.

• This sensor also has an option for resetting to factory default. Long pressing for 10 seconds a button connected to GPIO0 and GND will reset the sensor!

Schematic

Custom PCB design

I've designed a simple PCB for a 3D printable case. The design isn't the smallest one, but for reason: ESP8266 may heat up enough for distracting the DHT22's temperature measurement!

You can download the PCB Gerber files from here.

Prefix	Value	Package
R1	10K Ω	SMD 0805
R2	10K Ω	SMD 0805
R3	4.7K Ω	SMD 0805
R4	10K Ω	SMD 0805
R5	10K Ω	SMD 0805
C1	100nF	SMD 0805
C2	10uF	SMD 0805
C3	10uF	SMD 0805
C4	100nF	SMD 0805
C5	100nF	SMD 0805
D1	SS14	SOD123
U1	AMS1117-3.3	SOT223
Reset	Tactile 90 degree button	SMD 3x6x3.5mm
Serial	2.54mm 4P header	(optional)
H1	5V power	old microUSB female cable

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