# Arduino project diagram **URL:** \ **Category:** General Guidance\ **Created:** [October 8, 2022, 7:26am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630 "2022-10-08T07:26:55Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![clye](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@clye](https://forum.arduino.cc/u/clye)\ **Post date:** [October 8, 2022, 7:26am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/1 "2022-10-08T07:26:55Z")
Hi guys, so i have my first ever major project in Arduino. I'm having a hard time about the power supply of my Arduino which will be use in everyday and night activity. I have my first choice which is Solar panel and Power bank, but the GSM module doesnt work when the power bank is charging. see image below, i dont know what is the problem here (or power shortage is the problem, not sure). ![powerbanksupply](https://europe1.discourse-cdn.com/arduino/original/4X/5/a/7/5a752efe3d6c5d096fc55141b216268afe8d1026.png) My 2nd choice is solar panel with solar charge controller and battery(no idea on how many volts) to supply the Arduino, please see image below for the connection. Usb output 5v 2a to arduino ![powersupplyusbtype5v](https://europe1.discourse-cdn.com/arduino/original/4X/a/5/a/a5a1e3d1689c70df91b7628e0cf0532afc3e6456.png) Usb type depends on output voltage (no idea if this works) ![powersupplydependsonoutput](https://europe1.discourse-cdn.com/arduino/original/4X/c/d/b/cdba50e73b0cbfb1481128d910a19dd1b5ad6b39.png) or do you guys have some suggestions or recommendation for my power supply and what is the IDEAL voltage for my SOLAR PANEL, BATTERY and ARDUINO? Thanks! ---
**Author:** ![noiasca](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/noiasca/32/1126910_2.png) [@noiasca](https://forum.arduino.cc/u/noiasca)\ **Post date:** [October 8, 2022, 7:32am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/2 "2022-10-08T07:32:47Z")
I'm missing the power source / connections of your GSM Module. I assume it will not work without power - or not correctly if not properly sourced. Second picture " Usb output 5v 2a to arduino" if you add a power lines from the Solar Charger USB outlet to the GSM Module it might work. ---
**Author:** ![clye](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@clye](https://forum.arduino.cc/u/clye)\ **Post date:** [October 8, 2022, 7:49am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/3 "2022-10-08T07:49:47Z")
Oh, i didnt mention in the post, mybad. The power source of GSM Module is connected in the arduino.(it's working tho) So u did mention to add lines to gsm to GSM module. I used the 3rd picture and add some lines. ![gsmsim900a](https://europe1.discourse-cdn.com/arduino/original/4X/b/4/f/b4ff440b96d4e29871f3781c41fe849aaf8a9b70.jpeg), is it recommended? ---
**Author:** ![noiasca](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/noiasca/32/1126910_2.png) [@noiasca](https://forum.arduino.cc/u/noiasca)\ **Post date:** [October 8, 2022, 7:54am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/4 "2022-10-08T07:54:38Z")
x > [@clye](#): > > So u did mention to add lines to gsm to GSM module. I used the 3rd no I didn't recommend that. Pls read again my post. I would start with the wiring from picture 2. ---
**Author:** ![build\_1971](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/build_1971/32/689930_2.png) [@build\_1971](https://forum.arduino.cc/u/build_1971)\ **Post date:** [October 8, 2022, 8:03am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/5 "2022-10-08T08:03:36Z")
Your last scheme creates a ground loop (solar controller - arduino - gsm - solar controller). That is not a good thing. Since you should keep gnd, tx , rx together from arduino to gsm, it is best to also feed gsm from arduino. ---
**Author:** ![clye](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@clye](https://forum.arduino.cc/u/clye)\ **Post date:** [October 8, 2022, 8:10am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/6 "2022-10-08T08:10:46Z")
this works now, i seperated the wire for power supply of GSM Module from arduino, and created a new line, also working while charging! Thanks for the idea! ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [April 6, 2023, 8:11am UTC](https://forum.arduino.cc/t/arduino-project-diagram/1039630/7 "2023-04-06T08:11:24Z")
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