Hello everyone I am currently working on the Sim800l, MQ2, Esp8266 project.
As you know
The Sim800l consumes exactly 4v 2A.
MQ2 consumes exactly 5V.
The Esp8266 consumes exactly 5V.
I have a 5v power supply.
The problem is that I ordered a step-down module. It lowers well but gives out only 1.5 A.
I just ordered in large batches. Are there any options to solve this other than buying a step-down module. Can other options be solved?
2 in parallel?
Yes, with one 5 V power supply.
I need to distribute the voltage correctly to all modules.
Im afraid your questions aren't making much sense. What does the step down module do?
We simply do not have a ready-made step-down module. But there is a store of electronic devices. Is there anything I can do with it?
What does this do? Is it 5v to 4v at 1.5A max? If so, maybe you can connect 2 in parallel to get 3A.
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Check the specifications again. Those modules are intended to run from a LiPo cell, 3.4 to 4.2V.
The stated 2A figure is consumed only during transmit.
Thanks for the advice!
I just tested it in practice.
Using only one step-down module, let me remind you that it outputs 4V 1.7A
Then SIM800l turns on, tries to catch the network, but it will not succeed.
If you connect 2 step-down modules in parallel.
Outputs 4V 2.4A.
He also tries to catch the network, but he will not succeed. And I turned off the MQ2 sensor. And he immediately gets caught in the net.
Not a good idea, as they tend to "fight each other". Buy one that can output more than 2A. Or use a fresh, fully charged LiPo cell.
Is it possible to insert something diodes or something else so that they do not fight. Because I mistakenly bought a batch of another model. We need to save a little bit and do what we have
The problem is that each step down regulator has a slightly different output voltage, and it is designed to maintain that voltage at all times, if possible.
What happens when you put two in parallel cannot be predicted, as it depends on the rest of the circuit. They may oscillate in output voltage, which would be disastrous for your project.
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OK thanks a lot! Maybe you saved someone from an explosion
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