A small but useful higro and thermo - meter with OLED 0,66" 64x48 display and DHT11/DHT22 humidity and temperature sensor.

There was a bug in the wemos.ino.txt so please download again :) or just initialize the sensor in setup by insertint line: dht.begin();

He whole set is based on Wemos 1D mini controller with 0,66" OLED shield and DHT11/DHT22 sensor shield all for less than $9 from links at the bottom :)

It can be used as a stand alone version just to display data or as a wireless sensor logging to server via WiFi.

Screen display legend by line:

1. Humidity in percentage
2. Temperature in Celsius degrees (can be changed to Fahrenheit)
3. Current time - while connected
4. WiFi signal strength in dBi and two last segments of assigned IP address - while connected
5. Humidity bar - 0 - 100 %
6. Temperature bar - 0 - 40 degrees (it will not look nice with sub zero reading due to lack of space :) )

In the below example is the code for Wemos 1D Mini and PHP receiving script along with RPImonitor who gathers and displays the data.

Installation instruction:

Hardware:

print, sand, use some hot glue to attach the screen to the shell and to glue them together :)

Software:

Requirements:
none for stand alone version

www + php server - in my case Lighttpd + PHP on Raspberry Pi 3+

software for analyzing data - in my case RPIMonitor does the job

wemos.ino.txt - a complete Arduino code to be uploaded to your Wemos 1D - note that some changes like server ip have to be made to make it work

receive.php.txt - a file that receives the data on the server, it creates two files which stores last received value from the sensor. Do not forget to set the right permissions:

sudo chown www-data:www-data receive.php
sudo chmod 755 receive.php
sudo usermod -a -G www-data pi // to add pi user to www-data

RPIMonitor configuration for the Raspberry Pi 3+ setup:

/etc/rpimonitor/templates/temperature.conf

reads the most recent value for temperature

dynamic.17.name=remote_temp
dynamic.17.source=/var/www/html/temperature.dat
dynamic.17.regexp=(\d+.\d+)
dynamic.17.postprocess=sprintf("%.3f", $1)
dynamic.17.rrd=GAUGE

and humidity

dynamic.18.name=remote_hum
dynamic.18.source=/var/www/html/humidity.dat
dynamic.18.regexp=(\d+.\d+)
dynamic.18.postprocess=sprintf("%.3f", $1)
dynamic.18.rrd=GAUGE

and shows them as text

web.status.1.content.4.line.2=data.remote_temp+" | "+data.remote_hum

and displays them on the graph

web.statistics.1.content.8.graph.3=remote_temp
web.statistics.1.content.9.graph.4=remote_hum

under the given names

web.statistics.1.content.8.ds_graph_options.remote1.label=Remote temp *C
web.statistics.1.content.9.ds_graph_options.remote1.label=Remote hum %

be sure to update line and content numbers accordingly

If you like it you can order the needed parts here:

Wemos 1D Mini -> http://s.click.aliexpress.com/e/bIteLhb2
Oled Shield -> http://s.click.aliexpress.com/e/dTXoboy
Sensor Shield -> http://s.click.aliexpress.com/e/bWIrdX5Q

3dTalk Mini

Yes

Transparent filaments are cool because you see the diode blinking inside :)