Earlier this year we moved from Berlin to Lisbon and found a nice apartment not too far from the city center.
Our apartment building door, like most around Lisbon, is old and doesn’t work very well. And with many friends coming to visit this summer, I decided to automate the door so that me and my friends can open the door using our mobile phones instead of spending 5 minutes trying to jiggle the key in the lock to get it open.
Just finished writing a small C++ class to work with multiple HC-RS04 sonar transducers with a non-blocking way with the NewPing Library.
In this exact code I connected two sensors, but you can add as many as you like.
To add new sonars, just create a new instance of it adding the echo and trigger pins.
Here is an example with some NeoPixels, just for fun:
Do you remember IRC? Yes, it’s still alive and strong. Just connect to the Freenode network and you will find many very interesting channels where you can talk electronics, exchange information and ask questions! If you are there, drop a line to spillere (me!).
During the First Meeting of Electronic Arts in FlorianÃ³polis, we built a Breathalyzer using the Alcohol Gas Sensor MQ-3 and an Arduino Board to use in the last day of the meeting, in which we gave a party. You can see a quick video two posts below. Last days I received many emails asking for the code or how to make one, so I decided to build the sensor again, take pictures/videos and make a tutorial showing how you can make one, so here it is.