PCB-30012017

Release date: 30/01/2017

Dimensions: 6.6×9.5cm

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

Download link: 

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
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, tolerance ±5%; package 1206 [SMD]; resistance 4.7kΩ
RasPi RaspberryPi Zero V1.3

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

Known issues

  • 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

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