Hello, here's my problem, in the cabre of a project using an arduino nano board, I had the idea of powering it with a simple 3.7v lithium battery using a tp4056 module and a converter to go from the 3.7v battery to the 5v needed for the board to work properly. The wiring diagram is attached. After connecting the battery to the tp4056 and the converter, I can recharge the battery without any problems, only, if I add the arduino board, the two leds on the tp4056 light up during the charge and the arduino board doesn't seem to be powered when the whole thing is off the mains. If anyone understands my problem and can help me I would be very grateful. thank you in advance.
Do you have a multimeter? If so, what is the voltage on the Nano's 5V pin when the problem occurs? And what is the voltage on OUT+?
Do you have a link to the boost converter you are using?
Have you tried removing the converter from the circuit, and running the Nano directly from OUT+ (to the 5V pin) and OUT- (to GND) of the TP4056 module?
What is the device on the OUT- of the TP4056? Is it a switch? What kind of switch?
Perhaps the following explanations will help you:
The step-up converter even increases the power requirement.
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As discussed in the guide linked above, the TP4056 cannot properly charge a battery that is connected to a load, or handle "load sharing". You will need a different circuit design to accomplish that.
This Adafruit charger module does handle load sharing.
Unfortunately I don't have a multimeter.
Yes, I have a link to the boost converter.
I haven't tried to remove the converter but as the arduino requires precisely 5v, I'm afraid of damaging it.
It's a switch on OUT -, but I have the same problem when I remove it from the circuit.boost converter
Thank you, I'm going to try and review my circuit and I'll keep you posted.
I'm going to read this, thanks for the help
A classic Nano has a safe VCC working voltage range of 3.85 to 5.5volt.
Leo..
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That would suggest there's a problem with the boost converter. If you look carefully at the TP4056 board, you'll see that BAT+ and OUT+ are actually shorted together. So when there's no USB power, the only thing working on the TP4056 board is the protection circuit.
So there are two things to try at this point. The first would be to see if the Nano will run directly from the battery, as suggested before, so the converter isn't in the circuit. If there are other things connected to the Nano that actually require 5V, they may not work correctly. But the Nano by itself running the Blink example should work ok as a test.
The second thing to try is temporarily take the charger board out of the circuit, and run the battery directly into the converter, and then see if the Nano works.
While those tests may indicate that one part or another is simply bad, the other possibility is something like interference from the converter messing up either the charger or the Nano. Do you have any capacitors you could insert across the input of the converter, or its output?
The other possibility is that you have the converter wired backwards. I assume the Fritzing icon for the converter is just generic, but the pinout in your diagram is the opposite of what your link shows the actual pinout to be. Anyway, it's worth checking that just to be sure you have it right per the link.
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