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Module: Meteo

Ludovic Courgnaud edited this page Aug 20, 2021 · 1 revision

USB Type C Connection

USBC

Modules are connected using USB Type C connection. Just never forget that USB Type C can be plugged in 2 ways when wiring. For this modules, we will be using only I2C pins (SDA, SCL) and 12v connection that we will transform into 5v with the buck converters. Other pins provided by the Raspberry Hat will remain unused.

5v to 3v3 Transformer

3v3

Some modules just use 3v3 instead of 5v power. We are just using a little transformer. I preferred this way to the classic "resistors" in series in order to avoid to improve efficiency of the circuit and lose less power as heat.

I2C Equipments

I2C

3 I2C equipments are plugged on the circuit. I left 2 slots available if you want to connect other Meteo I2C equipments in this module. An optional Pull-Up resistor is available and connectable with a jumper. I did not connect anything because I did not need it in my circuit. Often sensors you will buy come with their own packaged Pull-Up resistors. In some case and if you add I2C modules / sensors, you may need to remove them and use your own. Here comes the jumper!

I2C Equipments: GPIO PIN Extender

GPIO

As everything is not I2C compatible, this MCP23008 chipset allows to act like additional Raspberry Pi GPIOs and compatible with... I2C! 4 ports are used for sensors, and 2 are left if needed. Note that A0/A1/A2 are all linked to ground. Thus, this I2C component will have the address 0x20. In total, we will be able to use a maximum of 7 chipset like this one in our modules. This should be sufficient!

Rain Sensor

Rain

Rain sensor is available and directly made within the PCB enclosure. You will just need conductive screws! It is then speaking with our MCP23008 microchip.

Photoresistor

Photoresistor

  • What are we doing?
  • Astrophotography!
  • When are we doing it?
  • By Night!

This little sensor will avoid performing useless task with other sensors during the daylight!

Light To Frequency

Photoresistor

You now have the power to transform Light into... frequency! That sounds very useless isn't it? Well, yes! Except if you want to process sky quality !

Save Button

Photoresistor

What a weird button. But, what if you want to save Meteo Module data without having to go onto the web interface? This button is made for you. You will then be able to save all Meteo information (Temperature, Pressure, Sky Quality, etc.) with one finger!