This site is maintained in order to present a seismometer project as an educational project for schools and students. The goal of the project is to build an inexpensive but highly precise seismometer, which offers high resolution and live data representation over the internet.

The project is divided in its entirety into three parts, of which the first one is the computer science part (software), another part is the electrical engineering part (electrical hardware), the third and last part consists of mechanical engineering (mechanical hardware: casing and fixture of the sensors).

The seismometer essentially consists of a geophone sensor, an analog-to-digital converter (ADC), a control unit and a casing. During the project time, different approaches will been tried out; they will be documented in the following posts. The project started in January 2019 and is work in progress. If possible, the project shall be extended to a 3D ultra precise seismometer, which is connected to the international IRIS network. IRIS is a consortium of over 100 US universities dedicated to the operation of science facilities for seismological data. IRIS programs contribute to scholarly research, education and earthquake hazard mitigation [https://www.iris.edu].

The best way to follow the project is to read all posts below in chronological order.

If you like the project or have questions or remarks, use the field for comments under each post. Please always stay polite. It should be self-evidently that hateful or impolite posts will be deleted from the administrator without hesitation [“I am paying for this microphone, Mr. Green!” as Ronald Reagan said…]. If you are a teacher or student, who wants to build a seismometer for your school class or for yourself, don’t hesitate to get in touch with me over Email.

Thank you very much for visiting my page.

 

Dr. Jürgen Abel
Email:

Specification

Status

A proof of concept of the seismometer is successfully completed.
The current version V0.2 of the seismometer is a beta version, which is able to visualize first data.

Projected installation date

Projected date for installation in the ground is spring 2019.

Resolution

ADC raw resolution: 32 bits

ADC noise free bits: 19 bits

Sampling rate

500 samples per second

Geophon Sensitivity

28.8 V/(m/s)

Next tasks

Optimize ADC programming.

Posts

The ADS1115 from the last version had 16 bit resolution, which is a little few for a good seismometer. Most commercial seismometers use 24 bit resolution ADCs. Therefore, different ADCs have been looked for with a higher resolution, before much code is developed, which would have been to be rewritten because of a different ADC, exspecially if the ADC uses a different interface bus.After
The beta version V0.1 of the seismometer is based on the Raspberry Pi. The ADC is a ADS1115 analog-to-digital converter with a resolution of 16 bit. The geophon is the SM-24 geophon. This version is still very simple and only a raw proof of concept. But it is able to visualize already some geophone data. Hardware Raspberry Pi The Raspberry Pi model 3B is
Now we are going to setup the Raspberry Pi with Midnight Commander (MC), the Network File System (NFS), the powerful PostgreSQL server, a PASCAL IDE, some tools, I²C and SPI. Hereafter, PC means a PC with a LINUX operating system, here KUBUNTU 14.04 is used. Heat Sinks In order to run the Raspberry Pi in continuous operation and for overclocking, it is advantageous to
Since of its limitation the ESP32 solution was no longer pursued. Looking for a more powerful alternative, the Raspberry Pi became the first choice, as it was used before in robotic projects. The Raspberry Pi offers many advantages and possibilities: SSD connection using an USB 3.0 to SATA converter, LINUX as an operating system, several PASCAL IDEs, several SQL servers, web servers and much
The first version of the seismometer is based on the micro controller ESP32. The ADC is a ADS1115 analog-to-digital converter with a resolution of 16 bit. The geophon is a SM-24 geophon from Sensor Nederland B.V.. ESP32 The ESP32 is a 32 bit micro controller loaded with a lot of utilities. The version used here is a board based on the SX1276 LoRa chip