About the article

Extendable Environmental Monitoring System

publishes data on IoT platforms

Based on a Labs project | May 2019 | Find it here
Extendable Environmental Monitoring System
The Environmental Monitoring System measures the background ionizing radiation level (gamma and beta) and publishes the data on IoT platforms like openSenseMap and ThingSpeak. The Geiger-Müller tube voltage is adjustable and up to two tubes can be connected as well as other sensors.
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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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list

Component List

Illustration 190297-021-94

Illustration 190297-022-94


R1 = 47Ω

R2-R5 = 330Ω

R6 = 3.3kΩ

R7-R12 = 4.7kΩ

R13 = 5.6kΩ 1%

R14-R18 = 10kΩ

R19-R22 = 27kΩ

R23,R24,25 = 100kΩ

R26 = 470kΩ*

R27,R28 = 1.5MΩ 1.6kV (e.g. Vishay HVR2500001504JA100)*

R29,R30 = 4.7MΩ 1.6kV (e.g. Vishay VR25000004704FA500)*

R31 = 10MΩ 1.6kV (e.g. Vishay VR25000001005FA500)*

P1,P2 = trimmer 10kΩ (e.g. Vishay T73YU103KT20)



C1,C2,C3 = 330pF NP0/COG

C4-C14 = 22nF 250V film capacitor (e.g. Epcos B32529C3223J000)

C15-C18 = 100nF X7R

C19A,C20A = 100nF 630V film capacitor (e.g. Epcos B32671P6104K000)*

C19B,C20B = 100nF X7R 1.5kV (e.g. Kemet C2225C104KFRACTU)*

C21,C22 = 100μF 25V

C23 = 220μF 16V, low ESR



L1 = 47µH, radial (e.g. Würth Elektronik 744 772 047 0)



D1,D2 = 1N4148

D3-D13 = BAV21

D14,D15 = 1N5819-B

D16,D17,D18 = SA5.0A

LED1 = LED 3mm red

T1-T5 = BC547B

T6,T7 = 2N7000

T8 = IRLD110PBF*

IC1 = ICM7555

IC2 = CD4093N

IC3 = P82B715P

IC4 = Step-down regulator Vin 8-28V, Vout 5V, 1A, Würth Elektronik 173 010 578



BZ1 = Sound transducer (e.g. Loudity LD-BZEG-1205/3)

F1 = polyfuse 500mA (e.g. Littlefuse 60R050XPR)

K1: DC socket 2.1/5.5mm (e.g. Ninigi PC-GK2.1)

K2: 2-way PCB screw terminal block, 5mm pitch

MOD1A,MOD1B,MOD2 = 20-way pin socket, 0.1'' pitch, bottom entry (e.g. Würth Elektronik 613 020 157 21)

S1,S2,S3 = pushbutton (e.g. C&K Components D6R10LFS)

SENSOR1-SENSOR3 = RJ45 jack (e.g. Molex 85503-5001)

LCD 2x16 alphanumeric module, I2C, Raystar Optronics RC1602B5-LLH-JWV

ESP32 devkitC with header pins

For G-M tube: 2× 5mm fuse holder clip


(*) see article text.

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