A few months ago i’ve presented a workshop about Arduino and decided to build a simple meteorological station. The station measure the temperature and humidity level, showing the values on a LCD and on a visual indicator. This indicator as three leds: one blue, one green and one red.
One of my projects is to automate a LEGO City, especially the train section. For that i need a place to save all the information. Initially choose a SQL database (MySQL), but as necessary to create custom tables for each case and create relations. But as i didn’t know what information was supplied by the City and i would need a communication protocol ( i’ll use MQTT. In the future i’ll write a tutorial how to use it) i choose a NoSQl database, MongoDB.
In this year Eletrónica e Informática (http://ei.aicb.pt) i presented a project prototype of an autonomous car controlled by an Arduino Nano.
The project was simple: a r/c car was controlled by an Arduino nano and uses an ultrasound sensor to detect obstacles that was in his front. If it was detected an obstacle, it stops, moves back and changed direction.
Is a project that i’m building a problem arise. It’s necessary to connect an Arduino to an ESP8266. But the arduino outputs are 5V and the ESP8266 inputs work with 3.3V. If it is connected directly, the ESP8266 burns.
Today I came across a relevant situation. I was necessary to show a Microsoft PowerPoint presentation an a TV. But the TV and the laptor were 50 meters away, the laptop could not be places near the TV and the only cable that was installed between the two was a coaxial RF cable. The only laptop output that could be used was an S-Video.
How to convert S-Video to RF only with the existing equipment?