Step 12: Receiver hardware

I had to enlarge the hole on the Arduino to make the 4-40 screws fit in it.

I also had this piece of plexiglass for my science fair back in 2001 laying in my room. I mod it to fit my project.

I also give out the test template I printed it out.
<p>Nice One. Thanx Dude</p>
<p>that is sooooooooooooooooooooooo hilarious </p>
<p>Whoa, I received my MQ-4 from China today. Plugged it in, and it had a short. Instead of heating up the sensor element, it turned the printed circuit board red hot. Left some nice burn marks on my fingers. Well, that was every bit as fun as touching the business end of a hot Solder iron.. <br>I also have an MQ-5 in my parts bin, but it's listed as a Liquid Propane gas detector. The MQ-4 was supposed to be for Methane. I hope the seller in China will send me a new MQ-4 that doesn't self destruct.. Maybe by the time it arrives, my burns will be fully healed over ;-P</p>
<p>I did something similar but a bit simpler. Used MQ-9 instead.<br>This system detects farting and turns on the fan to get a rid of a smell. Once the smell is gone it turns itself off.</p><p><a href="http://arturito.net/2014/02/02/fart-detector-with-fanventilator-made-with-arduino/" rel="nofollow">http://arturito.net/2014/02/02/fart-detector-with-fanventilator-made-with-arduino/</a></p>
I am re-using this protoboard for a new project. I see some design mistake in the power supply. <br>The input of the 3.3V should be connected directly at the output of the 5V and not 12V. <br> <br>If you connect them like this schematic, you go from 12V to 3.3V that's 8,7V drop inside the LM1117 voltage regulator. Same for the 7805: 12V to 5V is 7V. Since I use linear regulator, they are not efficient and heat up. The more voltage across them the more they heat up. So by connecting the LM1117 after the 7805 I go from 5V to 3.3V the voltage drop is less and will heat less. <br> <br>Good luck <br> <br>
I wonder if you can make the receiver echo the signal back and measure the microseconds it took. Would there be a significant change in time along with varying the distance between the transceivers? <br> <br>I'm planning on making an autonomous robot and I'm looking for a (local) positioning system. If you have time, please give it a try, I'll drink a bear in your health :). I wouldn't want to buy the parts for nothing.
LOL!!! I laughed so hard I farted!
lol c'est drole, mes interesant :D
Haha toute qun projet sa ;) vraiment bien expliqu&eacute; et illustr&eacute;! Jaime vraiment la clart&eacute; des tes images !! Great that you are back on instructables!<br><br>Nicolas
Attend de voir le vid&eacute;o! :P<br><br>j'upload sa demain matin!<br><br>Merci!

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Bio: I am a French Canadian that loves robots and embedded electronics. I work on all kinds of cool projects, like a high-power electric push scooter ... More »
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