Release date: 30/01/2017

Dimensions: 6.6×9.5cm

Type: FR4 proto: 2 layers / 1.2mm / HASL

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Assembly List

Label	Part Type	Properties
DHT	DHT11/22/AM2301	Optional component, output signal Digital Signal; sensing element Polymer humidity capacitor; power supply 3.3-5.5V DC
BME	BME280	Optional component, output signal Digital Signal; power supply 3.3-5.5V DC
Heating Relay	OMRON PCB Power Relay – G5LE	contact rating 125VAC @ 10 AMP / 30VDC @ 8 AMP; switching circuit SPDT; package THT; variant variant 2; voltage 12V; part # G5LE-1
Hot Water Relay	OMRON PCB Power Relay – G5LE	contact rating 125VAC @ 10 AMP / 30VDC @ 8 AMP; switching circuit SPDT; package THT; variant variant 2; voltage 12V; part # G5LE-1
L, N, -, +5VDC	Power supply	HLK-PM01
D1	Rectifier Diode	type Rectifier; package Melf DO-213 AB [SMD]; part # 1N4001
D2	Rectifier Diode	type Rectifier; package Melf DO-213 AB [SMD]; part # 1N4001
Q1	PNP-Transistor	type PNP; package SOT-23 [SMD]; part # 2N2222
Q2	PNP-Transistor	type PNP; package SOT-23 [SMD]; part # 2N2222
R1	1.2kΩ Resistor	tolerance ±5%; package 1206 [SMD]; resistance 1.2kΩ
R2	1.2kΩ Resistor	tolerance ±5%; package 1206 [SMD]; resistance 1.2kΩ
R3	4.7kΩ Resistor	Optional component if non BME sensor requires it, tolerance ±5%; package 1206 [SMD]; resistance 4.7kΩ
Wi-Fi	USB WiFi adapter	TP-LINK TL-WN725N V2 or other rtl8188eu chipset-based adapters
RasPi	RaspberryPi Zero or Zero W	V1.3
LCD	3.5 LCD Touchscreen	3.5 inch LCD Touch Screen Display Module 320 x 480 with XPT2046 touch controller

Supported features

Snaps on RaspberryPi Zero/3/2
Supports all DHT11/22/AM2302/BME280 sensors (use appropriate pins and 4.kΩ in R3 if needed). Supports both 3.3V and 5V sensors.
Dual relay can control 2 independent contacts, like heating thermostat and hot water
Relays offer both N.C. and N.O. contacts to choose (N.O. contacts used by default)
Humidity unpopulated contact labelled 'Humi!' provide unprotected LOW/HIGH signal @ 3.3V directly from RaspberryPi
4x2.5mm holes for securing PCB and RaspberryPi on the case
User selectable output voltage for the contacts between input supply (default) or 5V
Additional CPU ventilation holes

Camera connector holder (the part that moves) needs to be removed to allow soldering close to the power supply. Some power supplies have slightly different dimensions and you may need to drill 0.5-1mm further the holes
Prefer connecting the sensor with wires and place it 4-5cm further to avoid thermal interference from CPU if you plan to enclose this PCB