Touch Display with CO2 sensor
prusaprinters
<p>I designed this as a small info screen for the desk. It can measure the CO2-level in the room.</p><p>Soldering is not easy - you need to do this between putting the layers together! Use small wrapping wire for the data channels and bigger ones for the power supply.</p><p>You should use a good USB power supply. Otherwise the display will flicker.</p><h3>Used Electronics</h3><ul><li>NodeMCU-32, V1.2</li><li>Sensirion SCD-30</li><li>2.4'' UNO Module (TFT-Shield), 240x320, 8bit Bus, Touch</li></ul><p>The display consists of 4 parts. Electronic parts can be inserted and fixed between these parts.</p><h3>Known issue</h3><ul><li>Round holes for fixing the parts are a little bit too small, but can be broadened with a drill</li></ul><h3>Wiring</h3><p><strong>SCD30 -> NodeMCU</strong><br>VIN -> 5V<br>GND -> GND<br>SCL -> P22<br>SDA -> P21<br><strong>2.4'' UNO Module -> NodeMCU</strong><br>LCD_RST -> P26<br>LCD_CS -> P32<br>LCD_RS -> P33 + P14<br>LCD_WR -> P12<br>LCD_RD -> P13<br>GND -> GND<br>5V -> 5V<br>3V -> 3V<br>LCD_D2 -> P23<br>LCD_D3 -> P27<br>LCD_D4 -> P15<br>LCD_D5 -> P19<br>LCD_D6 -> P18<br>LCD_D7 -> P17<br>LCD_D0 -> P16<br>LCD_D1 -> P4</p><p>Software (only as reference, needs to adapted):</p><ul><li>Pins for ILI9341-Driver needs to be defined in .h-File located in the library-folder. See User_Setup.h</li><li>Pins for Touch are shared with LCD_RS and LCD_CS. Thus switching between Touch and Display is required in the software.</li><li>In line 2 you can find the mysql command to create the table<br>Adapt the following in the .ino-file</li><li>Line 18, 19: Your Wifi credentials</li><li>Line 21 - 26: SQL-Server and credentials for storing and reading CO2-values</li><li>Line 28 - 30: SQL-Server with additional information to be shown (e. g. heating, ...)</li><li>Line 358: Here you need to adapt the SQL statement to get the data you want to display</li><li>Line 170 can be used to debug the touch screen. You see a small rectangle at the point of touch. Line 39 is used to map Touch to actual display.</li></ul><p><i>It is not easy to adapt this project to your needs! You should be familiar with NodeMCU, programming, SQL etc.!</i></p>
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