I have seen this on youtube SIM900A with arduino tutorial. How to send and receive message - YouTube and I have read that you should not power your gsm module using the Arduino 5v. Is this actually possible?
I don’t know the specifics of that board
Many GSM module require up to 2A when joining the cell network or transmitting - which they can’t get from the 5V pin of an Arduino powered by USB and should not anyway as this is too much current expected to flow through the small regulator of powered through the jack.
So if it’s the case here - you need to power the board separately
that's what actually I have seen but I have seen also some studies following the same output so I'm wondering if it is possible to have a single power source
In the picture in your post #3 it's unclear where power comes from.
you can have a single source, for example with a good quality 5V / 2.5A wall adapter ➜ just power in parallel the Arduino on one side and the GSM module on the other side. You might need a capacitor for the GSM module to make sure any burst in current needs do not create a drop in voltage that would get your Arduino to reboot
I forgot to mention, I will be using a solar source with some batteries if possible to power the circuit. do you recommend me going parallel?
I am really new to this to please bare with me.
something like this :
forget the way you charge the battery for the time being.
The questions are more about:
- Is the battery sized appropriately for the needs?
- can the USB boost converter let enough current through for the system to operate?
what you should do is get your system to work from an 5V adapter and measure peak / normal use power needs. That will let you size your solar / battery system appropriately. (will tell you as well how long it can operate when the solar system is not charging the battery)
yup that is my main issue as the USB booster only outputs let's say 1a in that circuit so I might need a different circuit
1A is likely not enough indeed - I'd shoot for 2 but worth doing this the right way. Read the spec, test with a power meter in real situation and then decide what Booster / batteries are needed and then size the Solar System. Note as well that you can't use the TP4056 might not be the most suited for charging your battery from solar. Get a real solar charger (for example Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits)
I am not sure if you can view this, assuming that I have a bigger panel/battery. will this USB converter work?
if the advertising is right, that module can deliver 5V/3A so would do the job
PS: they say though "Output overvoltage protection (1.5A fuse)" so if the fuse blows at 1.5A then it's an issue...
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