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d-diot Gas sensors and RGB lamp

franz-unix last edited by franz-unix

Hi,

today I have finished the wiki page of this node that is part of the d-diot project.

It is a gas sensor (MQ2) based on Arduino Nano and nrf24 radio module with a Neopixel RGB lamp, all in a 3d printable case.

This how it looks:

If someone is interested in the wiki page are reported all the details for the construction, including firmware, case design files and Kicad project of the GP pcb nano board.
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@NotYetRated Hope you'll find good uses and a fun time while building your sensors.
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@GLAB Uno-Nrf comms are ok, your node woulnd't get to sending radio packest if radio chip comms weren't ok. Instead of reflashing working node and gateway try backdating MySensors library in arduino. You should see what version is used in working gateway somewhere in your contrloller, or by connecing yor serial gateway directly to your PC. in case of ethernet/wifi gateway you can alco use MySController from here: https://www.dropbox.com/scl/fi/prn9p2cnheyteopokszor/MYSController.zip?rlkey=up54kg4lt2blmff66t2jlgeo6&e=1 if your working node/gateway in on 2.00 and your new node works with that, then you can update them all with minimal risk of borking it all.
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@OldSurferDude yes, you are correct. this sensor is capable of 50A continuous, which safely I would make it working at 40A max., but for such an important load as in your case I would go for a beefier one, like the ACS75x, 77x, but at this point I would also change the node's form factor for space and insulation reasons. On my application on the RV I have a max. curr. of 13A running on a AWG14-16 cable (European rules for RVs), so I did not ask myself too many questions beside, of course, safety. About the signal, it will be a sinusoidal signal swinging around Vcc/2. Vcc can be easily measured internally on the ATmega328. On all my DC sensors I measure Vcc at every loop, just before measuring the ADCs. Honestly, when the space is not an issue like in my RV, I would rather use a ring core current transformer, and I would get rid of noise, response time, power dissipation, but over all no need to cut any cable. Long story short, it has been a nice experiment and I used it for 6 months, and then I switched back to my RF-NANO based RS485-Modbus - Mysensors bridge connected to an off-the shelf power analyzer. Just for fun I attach a pic of my 12Vdc sensors installed on my RV. Forgive me for the spaghetti wiring on the right side, but this is an area that needs improvement.
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Wow @Nicklas-Starkel congrats, that sounds great! And thanks for the feedback. Would you mind sharing your setup? Regards, Edi

d-diot Gas sensors and RGB lamp

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