scanos

Hi, it has worked for me when using 5 volts.

I think there has been a formatting issue somewhere with the php code. I have added it as direct code in this instructable. Just uncomment </phpRe running from the var/www/html directory, have you ensured that the php file has 755 properties and that the file owner is www-data or whichever user is running your web server.

Hi, electronics is not my strong point, purely a hobby. Have you considered what technology you will use to process the sensor data. As I understand it, most manufacturers in this area use proprietary processors / pcbs and not easy to interface with.Good luck, seems like an ambitious project.

It seems that you want to regulate (control) and purify (output) as part of this project. As part of the class feedback control loop, input, process and output, you haven't mentioned anything about input (sensors) or process (microchip etc). Is that outside the scope of your project?

Hi, I think Windows 10 automatically assigns a folder when you start a bluetooth transfer. In my case, it was my desktop,

Hello, I am not measuring the temperature from a DHT22 - I am measuring the internal temperature of the CPU - apologies if that was not clear

Hi, the $test = ""; line is to initialise the variable for use later. In terms of running the python file, please ensure that you have placed it in the directory referred to in the php script, in my case /var/www/. You can also check that the php file has the correct permissions (755 on Linux) and you can trying running the php file directly from the command line, i.e. sudo php/test_dht11.php - hope that works

Hi, my experience is that if you bypass the microUSb port then you will have to ensure that you address voltage peaks, dips, eg using a decoupling capacitor.

Hi, if you see "+CREG: 1" that is positive because it means you are connected on your mobile network. There are a number of things which could go wrong after that. Firstly, I have found that the FTDI basic from Sparkfun has very poor connections and quite often one of the cables slips out or comes loose.The other is that, in my experience, the GSm unit has lost power which is less unlikely. How are you powering the Sparkfun and GSM unit.

Wonderful plant. We got 3 harvests last year, so you should be able to get at least 1 harvest in late Spring where the NC temperatures are less than 75F. Alternatively, you could try growing it in a semi shady area and see if it grows in the heat of an NC summer.

I think rhubarb is a treat, period. Rhubarb puree with a little ginger and honey, as part of a fish dish, is particularly tasty. In terms of growing rhubarb, it doesn't appear to like temperatures above 75 f. I expect NC summer temperatures exceed that. However, the first rhubarb harvest of the season is May/June for us. Therefore, you might be able to get a late Spring crop. Alternatively, you could grow it in a shady place and hope for the best.

Hi, I set the 512 to 128 and it worked. I also guess that I could have used a higher rated resistor. Thanks for that. I assume that I can use your program to read a voltage from a DSB1820 temperature sensor?

Hi, thanks for the great instructable. It worked fine for me except I cannot get the led to dim. I am using an ESP-01 ESP8266, i.e. the one with 8 pins / 2 GPIOs 0 and ". Should it work? Can you clarify what you said about analogue signals., please