Un grande saluto a tutti voi. Arduino è un magnifico scenario di proposte, progetti in corso e finiti. Mi sto avvicinando a questo mondo perchè interessatissimo alla domotica ed all'utilizzo di Arduino nel settore DCC del modellismo dinamico. Spero di essere utile a chi frequenta questo forum e di trovare alcune risposte ai quesiti che proporrò (il primo già proposto). Sono in meritata pensione, i miei ultimi ventisei anni di attività lavorativa li ho trascorsi come consulente informatico nel settore della produzione e del gestionale,   sviluppando applicativi in COBOL, 4GL e SQL. Il linguaggio C lo conosco appena, ma mi faccio forte con la stratificata capacità di analisi dei problemi e delle strutture dei linguaggi di programmazione. Superficiale la mia conoscenza in elettronica. Mi accontento. Buon divertimento a tutti.

welcome!

First off, thanks for putting your code inside tags!

Second, I looked at your code and it appears you need to learn a bit more C programming since the code won't compile, as-is. A couple of hints to get you going...

You can't have multiple definitions of the same variable 'hallsensor'.  A beginner might use something like hallsensor1, hallsensor2, etc. or a better way would be to use an array like hallsensors[4] (if you are comfortable with that).

All your 'cylinder' variables need to have a type and you can't have spaces in the name so these should all be:
int cylinder1 = 4;
int cylinder2 = 5;
etc.

or again, use an array
int cylinders[8] = [ 4,5,6,7,8,9,10,11 ];


Probably the biggest issue with your code is that you can't just duplicate your interrupt code for all 4 hall sensors.  The arduino Mega only hase certain pins that allow external interrups.  Check out this link:
https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/

Good luck!

Hi. I am trying to get a SIM900 GSM Modem to communicate with Thingspeak to transmit data from a number of sensors (just one at the moment).

I have put together some code (which I have attached) after much searching on the internet however it does not seem to communicate and transmit the data.

From what I can tell it reads the sensor value as I have run this section of the code in isolation with it outputting the value of "value" to the serial monitor.

The hardware set up is fine as the set up sends texts with the data fine and the same set up should be required to send data over the network.

I think the issue may be that it is failing to connect to the internet however I am not 100% as I dont really understand AT commands fully.

I am using a Tesco Mobile Pre-Paid Unlocked SIM card which allows data and I have tested its data connection in a phone so it should not be that which is the issue.

It could be the wrong APN info in the command:
mySerial.println("AT+CSTT=\"prepay.tesco-mobile.com\",\"tescowap\",\"password\"");

I have got these three values from here:
https://www.teamknowhow.com/discover/discover/tesco-apn-settings

If anyone could give me any pointers as to where I am going wrong it would be appreciated and if you need any other info just ask.

Cheers
Calum

 

Non sto capendo onestamente, in che senso "spilla collegata ad una centralina a 12V...."

My circuit is basicly that


Pot 1 ------- 5v
        ------- GND
        ------- Analog 0



Pot 2 ------- 5v
        ------- GND
        ------- Analog 1



Pot 3 ------- 5v
        ------- GND
        ------- Analog 2

nRF24L01 --- its regulator ---- 5v
               --- And other cables
               --- And other cables
               --- And other cables


LCD (16,2) -------- 5V
                 -------- GND
                 -------- SDA
                 -------- SCL


I dont know what is Linear Potantiometer. It is in a drone remote controller