I must power a Wemos D1 mini at 5V (more on that below) (along with 4 LEDs and a DC motor) with a single cell AA battery. I have tried 2 boost converters (Vin 0.9V-5V) and none worked.
I need 5V for 2 of the LEDs, which are in series and 5V is perfect for them.
The motor will be driven with the 3.3V pin on Wemos D1 mini.
All the boost converters I tried deliver 5V unconnected. However, the moment I connect them to D1 mini, voltage drops around 1.5V. I tried with a power supply at 1.5V, same result.
I wonder, what I am missing. The specification says 600mA output current. I also tried to put a 100μF capacitor either to input or output side for sudden current draw. Supplying >3V worked fine. Dropping from 3V to 1.5V worked for a short while and then the output voltage dropped to ~1.5V. D1 mini draws ~70mA 5V. I wonder if I am missing something? Here are the converters I have tried:
https://www.amazon.de/gp/product/B07SSXVHP8/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1
EDIT: as a test I tried with MT3608, which requires >2V. I supplied it with 3V and got 5V out. It worked just fine. I guess all these cheap undocumented boost converters are bad.