Posts made by Johhnywalter

Ok,thanks for responds guys

Hi,
Is it possible to program the microcontroller on the HC12 board to directly read simple inputs such as switches or a voltage and send a signal by itself best socket? Or maybe pull up or down a pin when certain command is received?
Great article!
Regards,
Jon

Hello,
i'm working on the Samyoung DSM501A dust sensor.
I would like to share my results with you, and ask you if someone has used this sensor too.
This sensor works like the Shinyei PPD42NS.
To get particle values > 1um, i read low ratio from output Vout2 (look at the datasheet).
To convert it to something usefull, this function.
concentration_pcs283ml = 0.02791 * ratio2^2 + 614.1*ratio2 + 4.926

This function is derivated doing polinomial fit from the low ratio vs particle (pcs/283ml) graph you can find in the datasheet.
There is another interesting graph in datasheet, that let use correlate low ratio to ug/m^3.
The derivated function is:
concentration_mgm3 = 0.001915 * ratio1^2 + 0.09522 * ratio1 - 0.04884

I use the same functions read above to convert value read from the Vout1, with control pin open (no connection), which should be for particles > 2.5um.

Now the questions:

1. do you see something wrong in what i've done above?
2. I - actually - don't have any instrument to correlate the value i read to PM1 or PM2.5 real values. Do you have instruments to do this?
3. If i substract concentration_mgm3-forVout1 to concentration_mgm3-forVout2 i should find particles with diameter between 1um and 2.5um, so i can find PM25 particles, right?

Hello, has anyone here used LiFePO4 batteries to power MySensors nodes ?
The look really interesting for low power nodes in 10440 format :

low capacity compared to li-ion but somewhere between 200 and 280mAh which is ample for over a year
low self discharge which allows to survive the full year
maximum voltagehttp://jonsguide.org/best-laser-measure-reviews/#bosch-compact-laser-distance-measure-120-feet-glm-35 below the NRF24 max so no need for a regulator with measure!
minimum voltage around 2V but with a light load if I believe the discharge curves I see over 90% of the capacity is available with a voltage over 2.7V meaning most of the capacity can be used without changing the bootloader and BOD.
As it's a bit rare and expensive (at least for sellers offering delivery in my country ) and it needs a special charger I would like to have some feedback from people who are using some.

Thank you for reading

We’ve spent a lot of time researching smart home and home automation over the past year or so for our own house and there are a couple of sites that we continually refer to.

CNET give some really good in-depth reviews and features of specific smart home products however their website is pretty bloated with ads.

For the Smart Home is one of the better blogs for smart home stuff – I’ve gone to them for advice on a couple of products in the past and their articles are much easier to read than a lot of the other blogs on this topic.

Although they aren’t specifically focused on smart home/home automation per-se, The Wirecutter do some really thorough reviews of specific smart home products.

@keshav345 said in A6C Camera issues:

I have captured an image using A6C GSM module using the suitable AT commands through Ai thinker tool but when i try opening it will display as invalid image.

Hi, idk how to do with python unfortunatly not even in C++ (arduino) because i don’t have the level for do that but i know the steps: send the AT command for take the picture, and “read” it in HEX and store them, cut the extra code (all Jpgs start and finish with the same HEX) and save it in a file with the jpg extension, it’s done.After it my IP camera start working properly!
(It’s what i show in my video here: https://www.youtube.com/watch?v=poNPcxNvCww)

The most defficult is for me to save in Hex and cut the image because i can’t find an another projet with the same kind of problem