Release date: 14/07/2018

Version: v6.0

Dimensions: 6.2×8.7cm

Type: FR4, 2 layers, 1.2mm, HASL

Download link:

Assembly List

Label	Part Type	Properties
BME	BME280	Optional component, output signal Digital Signal; power supply 3.3-5.5V DC
K2 – 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
K1 – 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
H	Humidity contact	Unprotected I/O. Do not connect directly to a relay!
U1	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
J1	RaspberryPi Zero or Zero W	Any version

v6.0 - Supported features

- Thank you paciotti!
- Improved design with noise protection from high voltage spikes
- Snaps on RaspberryPi Zero/3/2
- Supports both 3.3V and 5V BME sensors.
- Dual relay can control 2 independent contacts, like heating thermostat, AC, fan or hot water
- Relays offer both N.C. and N.O. contacts to choose (N.O. contacts used by default)
- Humidity unpopulated contact labelled 'H' provide unprotected LOW/HIGH signal @ 3.3V directly from RaspberryPi
- 4x2.5mm holes for securing PCB and RaspberryPi on the case
- Additional CPU ventilation holes

- Camera connector holder (the part that moves) needs to be removed to allow soldering close to the power supply.
- 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