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Open-Network Weather Station Mk.2

Part 1: Introduction and hardware elements

Open-Network Weather Station Mk.2
Open-Network Weather Station Mk.2
In these times of climate change and global concerns about the environment on everyone’s lips, you too can make a positive contribution in the form of building a powerful and extendable weather station, not just for yourself and your ‘local log’ but also as part of global, open networks like ThingSpeak and openSenseMap. The station described in this 2-, possibly 3-installment article was designed with flexibility in mind as far as measuring and logging weather data is concerned, linked to minimum power consumption and high reliability out there exposed to the elements. The project revolves around an ESP32 module connected to off the shelf sensors and running free software with a lot of hooks for you to link to.

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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

TIP: your first PCB at AISLER is free up to €30 with using the coupon code ELCCBB at checkout.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

Component List

191148-034-94

191148-035-94

 

Main Board no. 191148-1 v.1

 

Resistors

R1 = 1MΩ, carbon film, 5%, 0.25W, 250V

R2,R3 = 100kΩ, carbon film, 5%, 0.25W, 250V

R4 = 220kΩ, carbon film, 5%, 0.25W, 250V

R5,R6 = 2.2kΩ, carbon film, 5%, 0.25W, 250V

R7,R9 = 1kΩ, carbon film, 5%, 0.25W, 250V

R8 = 1.8MΩ, carbon film, 5%, 0.25W, 250V

 

Capacitors

C1 = 100µF, 25V, radial 2.5mm

C2 = 10µF, 16V, radial 5mm

 

Semiconductors

IC1 = MAX8212EPA+ voltage supervisor

LED1 = red, 3 mm

T1,T2 = FQP27P06X, -60V, -27A, 120W, Vgs=–4V, Rdson=70mΩ

T3,T4 = BS170, 60V, 500mA, 830mW, Vgs=2.1V, Rdson=1.2Ω

 

Miscellaneous

K1 = 2-way PCB screw terminal block, 0.2 in. (5.08mm) pitch, 630V

K2 = 3-way PCB screw terminal block, 0.15 in. (3.81mm) pitch, 300V

K3,K4,K7,K8 = 2-way PCB screw terminal block, 0.15 in. (3.81mm) pitch, 300V

IC1 = DIL-8 IC socket
MOD2= 17-way SIL pinheader socket, 0.1'' pitch

K5 = Micro SD card BoB, from Elektor Store *

K6,K10 = 4-pin SIL pinheader, snapoff, vertical

K9 = 5-pin SIL pinheader, snapoff, vertical

LCD1 = 2x16 character backlit LCD with I²C Backpack, from Elektor Store *

MOD1 = OKI-78SR-5/1.5-W36-C, 5V 1.5A DC/DC converter, (Murata)

MOD2 = ESP32 Pico KIT V4, from Elektor Store

MOD3 = Elektor RFM95 BoB (optional for future extension)

S1 = pushbutton switch, IP68, Alcoswitch PB6B2FM3M1CAL07

Case: TK PS 94×94×57 mm, IP66 class (Spelsberg)

2 pcs hex spacer M3×25mm

2 pcs M3 nut

2 pcs M3×10mm machine screw

2 pcs PG7 Cable Gland Nylon, IP68

6 pcs short jumper wire, female-female

PCB 191148-1 V1.2 from Elektor Store

 

* stock/shipping issues expected due to production and export issues.

Component List

191148-057-94

 

191148-058-94

 

 

Connector Board no. 191148-2

 

Resistors

R1,R2,R3 = 10kΩ, carbon film, 5%, 0.25W, 250V

 

Capacitors

C1,C2 = 10µF, 16V, radial 5mm (6.5mm height)

 

Semiconductors

IC1 = LP2950-33LPE3, 3.3V LDO, TO-92

 

Miscellaneous

MOD1 = BME280 BoB from Elektor Store

MOD2 = WSEN-PADS BoB (Würth)

K1 = 3-way PCB screw terminal block, 0.15 in. pitch (3.81mm), 300V

K2,K4 = RJ-11 modular connector, 6P6C, vertical, Molex type 95503-2661

K3,K5 = 2-way PCB screw terminal block, 0.15 in. (3.81mm) pitch, 300V

PCB 191148-2 V1.1 from Elektor Store

Component List

191148-062-94

 

191148-063-94

 

 

Dust/Particle Sensor Board no. 191148-3

 

MOD1 = Particulate Matter sensor type HPMA115S0-xxx (Honeywell), Farnell # 2770767

K1,K2 = 3-way PCB screw terminal block, 0.15 in. pitch (3.81mm), 300V

WR-PHD 8-way receptacle, 0.05 in (1.25mm) pitch, Würth Elektronik # 653008113322

2 pcs pre-crimped wires, Würth-Elektronik # 653153128130

3 pcs M2×10 machine screw

Case: TK PS 94×94×57 mm, IP66 class (Spelsberg)

PCB 191148-3 V1.0 from Elektor Store

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