Summary of today: We will not work with the counter reset for the time beeing, we might change it or remove it completely in the final product. To learn why we ended up with that decision read on. What you see is the same Python test program we wrote the last week. We wanted to […]
This session we started to work with Python to read the data. The final dataflow Brice suggested (http://www.ulm-experience.com/) should look something like this: I2C -> MQTT -> Telegraf -> InfluxDB -> Grafana. For now python is in charge of reading the I2C data. Hardware We found another flaw in the schematics. The second counter is […]
Hardware This post summarises 2 sessions. We added a pull-up Resistor between the Raspberry and the probes counter reset line to remove uncertain behaviour in case the raspberry is booting up or is unconnected. You can get rid of the uncertain behaviour by just resetting the MCP and the counters but practices helps remembering :). […]
We continued verifying our current design and implemented the next part of the schema: The counter. We verified the counters by plugging LEDs in the according bits and looked if it’s counting correctly. In the video we cheated the second counter by plugging the input on another bit of the first counter, so we don’t […]
Hello everyone. It’s been a while and Christmas, holidays and people having time off comes to a conclusion. This post is all about getting our hands on the ordered material and testing parts of our circuit for the first time. We already found an error in our schema with how the windprobe is included. I […]
A complete list (we think) for the lab test components is under the meteo project folder (Test_Lab_Shopping_list.xlsx) and listed later in the blog. Also we had to change a capacitor value (from 180nf to 220nf) and the schmitt trigger because it is very hard to find these items. We updated the schema accordingly. We didn’t […]
This Session we finalized the schematics for the windprobe. The Diagram shown is tested in kicad and the electrical connections are all good. We changed how the interruptors are handled and what gets managed by the Raspberry. The Signal Management works over a I²C bus now. What is I²C and how does I²C work? I²C […]
Today: The pulse counter. We had a look at how the schmitt trigger works and searched for the right component. Then we continued to draw the electrical diagram. We are now almost done with the diagram and are done with the component search. But first lets take a look at the schmitt trigger: The schmitt […]
Today we specify a part of the signal processing for the wind measure: Signal Filtering. This is needed because we are going from analog to digital and that comes with problems. Namely corrupted bits. With signal processing we want to get rid of problems arising when energy currency switches from 0 Volts to 3.3V where […]
This should in the end be a tutorial for a complete weather station based on a Raspberry. Let’s start. […]