ESP8266 Community Forum

- Thu Jan 25, 2018 11:59 am #73487 Hello,
I'm trying to build an IoT app using a ESP-01S Kit: http://www.electrodragon.com/product/es ... fi-module/
my issue is related to the power supply. the ESP MCU requires 3.3V, and my design contains only one AAA Battery 1.2V.
So I need to add a step-up regulator to get the 3.3V. like TPS73633-EP. But it requires some reworks on the board, or designing a new board that integrates the step-up regulator.
My question. is there any board on the market with a step-up regulator already incorporated. I'm looking for a ready-to-use hardware.

Thanks

- Sun Jan 28, 2018 8:48 am #73534 Have you considered using a lithium ion battery? They are available in AAA form factor and offer 3.2v so will work with no additional circuitry. Apparently they are much safer than LiPo technology but offer a good energy density and are rechargeable. I bought a larger than AA one to test first and it came with a little charger circuit board, worth getting one for that.

AAA quick ebay search
https://www.ebay.com/itm/8pcs-Etinesan-3-2V-10440-AAA-200mAh-LiFePO4-lithium-Li-ion-Rechargeable-Battery-/272001880796

Here is a little charger board
https://www.ebay.com/itm/Micro-USB-TP4056-li-ion-TP4056-li-ion-li-po-Battery-Charging-Module-Protection/272986428636?hash=item3f8f4254dc:m:mZvOYFXrR8CXcgPDwxGjHyg

- Sun Jan 28, 2018 9:55 am #73535 I strongly recommend the LiFePO4 batteries so common today in yard fairy lights. A few years back, I built a prototype for testing:
https://www.hackster.io/rayburne/warwalking-a9c021

LiFePO4 are safe under all conditions and can be "float charged" at 3.45 Volts
https://www.powerstream.com/lithium-phosphate-charge-voltage.htm
which charges to about 96% - 98% full.
Depending upon how easy it is to access the battery, LiFePO4 pop-in chargers are relatively inexpensive.

Ray