Most of you must have watched quiz games in TV shows or at your schools where few contestants are required to press a switch if they know the answer to the question. An electronic system is required to find out exactly which one of then pressed the button first. This type of electronic system can […]
Fastest Finger First Quiz Project using ATmega16 Read More »
LED signage has become the choice in modern days to convey message to visitors of a venue. Be it corporate office, shops, restaurants or any kind of social functions like marriages. Some big and complicated display needs dedicated control PCs and designers to build contents for them. But for simple requirements a very low cost
Making a LED Message Display with Keyboard Interface Read More »
Room temperature display on big screen is a common requirement from industrial sector. Used in server rooms, PLC rooms, storage rooms and many other places in an industrial units. Traditionally seven segment displays of big size (say four inch height) were used. But now a days DMD (dot matrix display) have become so cheap and easily available
LED Dot Matrix Room Temperature Display using P10 and ATmega8 Read More »
Description In under 1kB, this project uses a tiny, custom-made pixel font to write a message to a display. It receives messages from the UART and writes them to the display. The font was created using my homemade small font designer (see external links). It includes all letters (uppercase/lowercase), numbers, and most punctuation. The font
This article describes a four-channel thermometer that monitors the temperature at four temperature sensors, and gives a continuous readout on a small 128×32 OLED display: It could be used in any application where you want to monitor multiple temperatures, such as in controlling a greenhouse, checking the output transistors in a power amplifier, monitoring key
Tiny LED Time Watch Read More »
Last Thursday I had a lot of fun doing a workshop at my college (UMass Amherst) where I taught students to use a WiFi-enabled Color LED matrix combined with Javascript programs to create animations displayed onto the LED matrix. The matrix is made of 5×7 WS2812 (NeoPixel) LEDs. I’ve actually designed it two years ago
WiFi-enabled Color LED Matrix using ESP8266 and WS2812 LEDs Read More »
In this projects 8 different colors are displayed with the use of a RGB LED. The microcontroller that is used is the ATMega8. An RGB LED is a LED which has three LED’s integrated in one packaging. These LED’s have the colors red, green, and blue. Such a LED costs about 1 Euro. With these
Below is the schematic that shows how the IC is wired to the ATMEGA328 microcontroller and the 4 digit 7-segment display with comon cathode. Besides the MAX7219 you need only three other external components: two capacitors and one resistor. The capacitors are here to reduce noise signals and cannot be ommited. The resistor is used
LED Driver MAX7219 – clock Read More »
From time to time, I see people trying to build an audio VU meter. In the analog era, that’s typically done with a voltage divider + a series of comparators; or using chips like LM3914/3915. Those chips are harder and harder to find, or you may need more resolution, or a different output profile. What
MCU-based LED-VU Meter Read More »
MQTT LED Matrix Display 7 Replies My MQTT network at home moves up and down a lot of messages: sensor values, triggers, notifications, device statuses,… I use Node-RED to forward the important ones to PushOver and some others to a Blynk application. But I also happen to have an LED display at home and that
64×16 MQTT LED Matrix Display Read More »
