Build your own precice seismometer with spectrum analysis

Author Jürgen

Spectral data analysis

In this post spectral data analysis for the seismometer is presented. First a short explanation is given in order to understand the main concepts of the spectral data analysis. Then the analysis of the seismic data is described. Finally, some… Continue Reading →

Simple data analysis

Various methods of data analysis will be presented in this post: velocity, low-pass filter (a special type of averaging with lower latency) of the velocity, RMS (root mean square) value of the velocity, integral (simulation of a heavy ball on… Continue Reading →

Data Persistence or DIVIDE ET IMPERA

Project decisions In a computer science project, some decisions have to be taken, which will determine the further course of the project. Sometimes, these decisions seem to be logical to other scientists, sometimes these decisions are controversial. Many times several… Continue Reading →

Setting the seismometer into the soil

After many months of work on the hardware part with the Rapsberry Pi, the ADS1262 and the geophon SM24, the seismometer was finally installed in the ground.Hereto, a 50 cm long spike was struk into the soil.Between the spike and… Continue Reading →

Preparation of the casing

Before installing the seismometer in the ground, a housing must be prepared. Here a small waterproof case with a transparent roof was used. The transparent roof is fixed with 4 stainless steel screws.The housing requires some holes for cable glands,… Continue Reading →

A pcb protoboard for the ADS1262

After the hardware with the ADC, voltage supply, geophone and termination of the geophone was setup, the hardware was transferred from the breadboard circuit to a prototyping perf board.Even though this is still a very simple and rough construction, far… Continue Reading →

A better termination for the SM24

Since the beginning of the project, a very simple circuit has been used to couple the SM24 sensor. It consisted of three 1 kΩ resistors: the one in middle serves as the termination shunt for the SM24, as indicated in… Continue Reading →

Using interrupts for measurements

In the past, the voltage measurements of the ADS1262 were recorded in a polling loop. A polling loop is the simplest form for performing repeated measurements. The loop reads a measurement and then waits for a certain time, e.g. 2… Continue Reading →

Increasing the ADC precision

In addition to the lack of system reliability of the Raspberry Pi, which was solved by switching the power input to the GPIO pins, there was another annoying fact: The strong noise at the input of the ADS1262. To keep… Continue Reading →

Reliability by removing under-voltage

During the development of the software, a strange behaviour of the Raspberry Pi could be noticed many times, as the Raspberry Pi didn’t interact after the ADC program was running for one day.Since the seismometer needs to work many days… Continue Reading →

A quantum leap in sensitivity by the ADS1262 or the two faces of the Roman god Janus

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… Continue Reading →

Beta version V0.1 of seismometer based on Raspberry Pi, ADS1115 and SM-24

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… Continue Reading →

Setting up MC, NFS, PostgreSQL server, PASCAL IDE, tools, bus interfaces and overclocking

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,… Continue Reading →

Preparing the Raspberry Pi for SSD, SSH and RDP

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:… Continue Reading →

Alpha version of seismometer based on ESP32, ADS1115 and SM-24

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… Continue Reading →

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