Archive for the ‘Instrumentation’ Category

Blog of the day

Amazing, impressive ! “the Cave Pearl Project” is, in my opinion, a major contributor to the open community: “The Cave Pearl Project was co-founded by Edward Mallon and Patricia Beddows: two people who are passionate about understanding caves and protecting karst aquifers. They have developed a data logging platform from inexpensive pre-made breakout boards, and […]

Power meter (Part 3)

Part 1, 2, 3 Once the hardware is ready, let’s have a look at the data and the software used to read these data. The customer information can operate in two different modes: historic: for compatibility reasons with older meters, this is the default mode. standard: this new mode, available from the latest Linky meters. […]

Power meter (Part 2)

Part 1, 2, 3 I have been tumbling through the net, looking for interfaces to the TIC. So far, I found two types of reference designs: The quick, dirty, safe but questionable design The academic design Most of the interfaces described on the web are very basic. They feature a single optocoupler and a biasing […]

Power meter (Part 1)

Part 1, 2, 3 Yesterday’s electric meters were mostly electromechanical meters. They were measuring consumption, they required a technician to read the past power consumption, diagnose them and change their parameters such as power ratings Today’s electric meters are communicating meters, which means that they can receive and send data without the need for the […]

Checking clock accuracy

This T&T explains how to check the accuracy of a Real Time Clock (RTC). Lets make it a little bit harder and say that you do not have access to the Internet… Checking a RTC requires a highly accurate reference time base which can be read from a radio signal. Starting from there, two options […]

TASCAM Sound Recorder (Part 2)

Part 1, 2, 3, 4, 5 And here it comes! Packed in a cardbox box which contains: 1 Tascam DR-40 recorder wrapped in plastic bag 1 mini USB cable 1 user Manual printed in various languages 3 alkaline batteries 1 small rubber stand in a small plastic bag! Watch out, this small rubber stand is […]

TASCAM Sound Recorder (Part 1)

Part 1, 2, 3, 4, 5 The followers of arduinoos know that I have a constant and strong interest in sound recording and analysis. As I get more and more requests for specific sound analysis, I decided to get a semi-professional sound recorder to capture sound events in various environments. Thus the wish list that […]

Particle sensors (Part 1)

Part 1 I am amazed by the massive improvements of sensors along the last 10 years. Not so long ago, some sensors would fit in a shoe box and require 24 VDC, not to talk about the interfaces, weight, etc. These improvements are mainly due to the incorporation of advanced sensors in smart phones: camera, […]

Direct Digital Synthesizer (DDS) (Part 9)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9 Let’s go a few steps further in the direction of a fully featured arbitrary wave generator ! The early posts describe how to generate clean waves at various frequencies. In this post, I will explain how to offset the signal and how to attenuate it. Setting negative offsets requires… negative voltage ! Which Arduino  platforms do […]

Random number generator (Part 1)

Part 1, 2, 3 As I was stumbling the web looking for advanced information on thermal noise, I found some very interesting papers on RNGs, aka Random Number Generators. These devices feature hardware components which are responsible for a generating unpredictable random numbers ! This is a very interesting matter as it involves physics, electronics, […]