make_thime

Objectives

This make project displays the time or the temperature & humidity, packed in a LEGO ® case. (LEGO is a trademark of the LEGO Group)

Solution

Display

• the time hours & minutes in HH:mm 24h format.
• the temperature (Deg C) and Humidity (%RH).
• uses 4-Digits in red.

Infrared Remote Control to set Mode

• [Button n] = [Mode]
• Button 1 = Display Time.
• Button 2 = Display Temperature + Humidity. No digits.
• Button 3 = Display Temperature with 2 digits.
• Button 4 = Display Humidity with 2 digits.
• Button 5 = Set Hours.
• Button 6 = Set Minutes.
• Button 7 = Set Brightness.
• Button 8 = Turn display on / off.
• Button 9 = N/A.
• Button - = Decrease Hours, Minutes, Brightness depending mode.
• Button + = Increase Hours, Minutes, Brightness depending mode. Notes
• When powering on, the default time is 19:58. Set the time by pressing button 5 for hours and button 6 for minutes.
• Ensure to press button 1 after completing settings via buttons 5 - 9 and -/+.

Creation Rules

• Use as microcontroller an Arduino UNO or compatible.
• Use standard LEGO bricks.
• Minimize LEGO brick modifications.
• LEGO Case with modular components.
• Build code with B4R.

Hardware Parts (approx cost EUR)

• 1x Arduino UNO (8 EUR)
• 1x 4-Bit LED Digital Tube Model (2 EUR)
• 1x DHT22 temperature & humidity sensor (8 EUR)
• 1x IR Receiver with Remote Control (4 EUR)
• In addition for the prototype: Breadboard (2 EUR)
• LEGO bricks (10 EUR)

Software

• Arduino IDE 1.8.0 or higher
• B4R 1.8.0 or higher

Wiring

LED Display = Arduino
CLK = Digital 8 (yellow)
DIO = Digital 7 (green)
VCC = 3.3v (red)
GND = GND (black)
DHT22 = Arduino
VCC = 5v (red)
DATA = Digital 4 (yellow)
GND = GND (black)
IR Receiver = Arduino
DATA = Digital 11 (purple)
VCC = 5v (red)
GND = GND (black)
(WireColors)

Soure Code

The B4R source code and required libraries can be found in archive thime.zip. The code is well documented.