Wednesday, July 25, 2018

Bluetooth Based Programmable LED Message Board Circuit Based aon ATMega328

Electronic Kit School. - This is the idea and implementation of remotely editing the text or message of the LED Matrix Display (Custom LED Signs) are presented. 

There are electronic design circuit to Bluetooth Based Programmable LED Message Board Based on ATMega328 like in the Figure 1 below. The main component are used like resistors, capacitors, Bluetooth and ATMega328

In this time, beside we will show you the circuit, here we also will show you component part and global description about this circuit.


Figure 1. Bluetooth Based Programmable LED Message Board Circuit Based aon ATMega328 (Source: Circuitstoday)

Component Parts
  1. ATMega328
  2. LED Matric
  3. Bluetooth
  4. Others

Circuit like in Figure 1 above show you about the Bluetooth Based Programmable LED Message Board Circuit Based on ATMega328. From Circuitstoday site describe that the message or text can be edited to bring custom LED signs by connecting the Display to a computer using a Serial cable (RS-232). The RS-232 Voltage level is converted to TTL Level using a level shifting IC (MAX 232). The serial data sent by the computer is then processed by the microcontroller of the Display circuit. The new message is stored in the EEPROM of the microcontroller. At every start-up or Power ON, this data is read from the EEPROM of the microcontroller and thus the message is displayed.

The idea is not limited to computer-based editing. It can be applied to any type of data transmission, which uses UART mode of serial data transmission, it may be wired or wireless. Nowadays, the Bluetooth feature of the smartphones is commonly used for remote control applications. The same can be used to edit the message of the Display as well. Below is the demo which shows editing the message using Bluetooth feature.


  1. This is extremely fascinating substance! I have completely delighted in perusing your focuses about led. as we provide outdoor electronic signs for sale at affordable prices. for more info visit our website.