Name: How to make a Temperature, Pressure, Altitude Logger [Esp8266, WiFi, Arduino]
Uploaded: 2019-12-22T12:03:14.000Z
Duration: 6 min 23 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Today we will create a simple temperature, pressure and altitude logger.

This device should be really easy to build. So, hang on!

The main driver is the WeMos microcontroller

It's based on the esp8266, which has built-in Wi-Fi capabilities.

The pressure sensor is available as this shield

It provides precise temperature and air pressure measurements.

The output will be done on this OLED shield.

To have enough juice while logging we will power it from this power bank.

You can find the links to the parts in the description.

The only soldering needed is to attach the pin headers.

The altitude is calculated from the air pressure.

The higher the altitude, the lower the air pressure.

The current altitude is estimated from  1000hPa at sea level

It will overestimate the altitude at bad weather

But more on this when we build a weather station.

For the software part of the microcontroller we will be using the arduino IDE this time.

The most of the work is done by some libraries.

First of all you need to add the esp8266 support,  if you haven't yet.

Then, we need also the following libraries:

Adafruit MQTT, Sparkfun micro OLED, Adafruit BMP085

Install all of them and you are good to go.

There are some settings to make in the code.

First of all, we need some access point credentials.

Since we will be logging the values using MQTT we have to set up the MQTT server here.

You have to enter your username and your secret API key here.

If you want to change the feed names you can do this here.

This delay defines at which rate values will be sent to the MQTT server.

Ok, you can also switch to Imperial values

but please don't crash another space probe.

My code will calculate the average values from each time span.

The Sparkfun OLED library seems to be the only one,

which supports the OLED screen with 48 pixel rows without any code changes.

To log the values outdoors I'm using my smart phone as an access point.

On Android this can be done using a mobile hotspot.

I'm using the same credentials as the ones from my lab so I don't need to reconfigure it.

But you could also add additional access points in the code like this.

Okay you can clearly see a pressure difference here,

Okay, I think we arrived at the place where to test it.

The altitude in the mountains was off by around 5%.

The only thing missing is the case. So, let's create one!

Good news! I'm doing YouTube full-time now.

To celebrate it I will give away three of those here on YouTube

and also get your name displayed in my videos like these supporters here.

To get one of these here simply write a comment containing the hashtag #giveaway and pick a color.

If you have missed this giveaway simply subscribe to get a chance next time.

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How to make a Temperature, Pressure, Altitude Logger [Esp8266, WiFi, Arduino]

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