Skip to content

Simulated Hex Values from Arduino


Arduino's are very common microcontroller boards used to study and design programmable electronics. It is often used with multiple peripherals such as buttons, sliders, sensors and motors.

Together with a TIMI acting as a small fancy display, Arduino boards become a lot more powerful and interesting to use in prototyping.

This project showcases a TIMI-96 module controlled by an Arduino Uno to print simulated 8-bit values in hexadecimal form. This also shows how to clear the PrintArea and change the print color.


To proceed with the project, the following are required.


  • TIMI-96
  • Mates Programmer
  • USB Type A to microUSB cable (for the Mates Programmer)
  • USB Type A to Type B cable (for the Arduino, replace as necessary)
  • Connecting Wires
  • Arduino Uno
  • Breadboard


Graphics Design

Step 1: Open Mates Studio and create a Commander project for TIMI-96 with Reversed Landscape orientation


Select Commander

Step 2: Browse the library for appropriate page designs. For this project, 6-Line Hex Print Area page under Notifications category was used.

Browse Library

6 Line Hex Print Area

Step 3: After finalizing the design, connect TIMI-96 to your computer

Connect TIMI-96

Step 4: Upload the project to the appropriate COM port

Select Port

Project Upload

Step 5: When prompted, click Proceed to continue with upload.

Date and Time Proceed


It is recommended that the graphics design is finalized before moving to the next steps when working on a project*

Programming the Arduino

Step 1: Install the MatesController library using Arduino’s Library Manager.

Library Manager

Step 2: Include MatesController.h to your project.

#include "MatesController.h"

Step 3: Create a MatesController instance named mates.

MatesController mates = MatesController(Serial);

This will initialize the MatesController instance to the default reset pin 4 using a LOW pulse.

Step 4: (Optional) Create a function for toggling the built-in LED of the Arduino board. This can be used for debugging or showing errors if the Serial monitor can’t be used.

int errLedStatus = LOW;
void ErrorLed_Toggle() {
  errLedStatus = ~errLedStatus;
  digitalWrite(LED_BUILTIN, errLedStatus);

Step 5: (Optional) At the beginning of the setup function, set the built-in LED pin to OUTPUT and set it to LOW.

digitalWrite(LED_BUILTIN, errLedStatus);

Step 6: To start using the MatesController instance, use the begin function


This will initialize the Serial UART at the default baudrate of 9600

Step 7: (Optional) The begin function can be enclosed in an if condition to handle initialization errors.

if (!mates.begin()) {
  // Display didn't send ready signal in time
  while (1) {

Step 8: In order to change the print colors, an array of 16-bit (RGB565) colors can be prepared.

const int16_t colors[] = {
  (int16_t) 0xFFFF, (int16_t) 0xF800, (int16_t) 0x07E0, (int16_t) 0x001F,
  (int16_t) 0x07FF, (int16_t) 0xF81F, (int16_t) 0xFFE0, (int16_t) 0x39FF

Step 9: In the loop function, the values are simulated and sent to TIMI as necessary.

void loop() {
  static int8_t val = 0;
  static int8_t ctr = 0;

  if (ctr >= 42) {
    ctr = 0;

  mates.setPrintAreaColor(0, colors[ctr % 8]);
  mates.appendToPrintArea(0, &val, 1);


As shown, the code utilizes two variables for value and print counter that is incremented at the end of the loop. By counting the number of times a byte was printed, the PrintArea can be cleared when full. It is also shown that the print color is changed depending on the print count.

Running the Project

After designing the user interface for TIMI and writing code for the Arduino and programming them, it is time to connect the devices together. Follow the diagram below for the connection between TIMI and Arduino.

Arduino TIMI Print Hex Values

Finally, supply power to the Arduino and observe the behavior of the project.

Downloadable Resources

The Mates Studio – Commander project and Arduino sketch are included in the MatesController library.

The Commander project is available under the extras folder of the library. You can find it in (if the library was installed using Arduino Library Manager):

C:\Users\%USERNAME%\Documents\Arduino\libraries\MatesController\extras\Print Hex Values.mates

Here are the links to the software applications, libraries and completed project files.