A solar panel used to charge a 18650 3.7 V battery through a TP module then connected to a voltage booster to boost the power up to 5V. The power supply is then attached to the arduino nano which will use a relay module that will switch on three 5V DC fan which is connected in parallel circuit when the DHT 11 temperature sensor detects a certain temperature.
The problem now is that when connected to the voltage booster, the fan will not switch on, but when connected to the laptop the fan will switch on. I tried to change it to 9V battery but the fan will still not switch on and the relay module will make a “flicking" sound. Do you guys have any solution to my problem?
The battery/booster cannot supply enough current to run the fans.
Determine the current draw of one fan, and multiply it by six for a safety margin. Choose a fan power supply with the correct voltage, capable of supplying that much current, or more.
Suggestion: first get the project working with just one fan.
Also, forget about Fritzy pictures, please post an image of a hand drawn circuit.
Please include all power supplies, component names and pin labels.
What are the specs of your fans?
If your booster is set for 5V, then you connect it to the 5V pins of the Nano, not the Vin.
DMM is a multimeter right? I do have a multimeter.
My power supply is a 18650 3.7 V 12000 mAh battery. Connected to a XL6009 DC-DC Booster Amplifier Power Booster that boosts the voltage up to 6 V. Which is then connected to the Vin and GRND pins of the Arduino Uno. The fans are 5V DC fans with each of them having a rated current of 0.27A.
Do I need to connect the booster to the 5V pin rather than the Vin?
If your booster is set at 6V, then no, the 5V pin needs 5V.
The Vin needs 7V or more, it feeds a linear regulator to give 5V, because it is a linear regulator a 5V output needs at least 7V up to 12V for input.
Why is your booster on 6V, when your fans are 5V?
Reset your 6009 DCtoDC converter to 5V output and connect to the 5V pin of the Nano.
Tom...
PS, Don't forget that for the amount of current supplied at the DC-DC output, you will be drawing almost twice that current from the battery.
I tried to connect the 5V booster to the 5V pin. The Arduino lights up for a second then suddenly the lights on the Arduino and the relay becomes dimmer. And unfortunately it didn't work.
Hi. I am trying to make an Arduino project that can run three 5V DC fans. The power supply must be a rechargeable battery that can be recharged with solar energy. Is there any suitable batteries that can be recharged with solar power and suffice to run and operate three 5V DC fans?
and words like '9v battery' to find out why that's a bad idea.
And I made the original suggestions because you did not specify any battery requirements except your need to run 3 5V fans. The battery I pointed out will, once charged, run 3 5V fans.
Your two topics on the same or similar subject have been merged.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.
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