💬 Easy/Newbie PCB for MySensors

[hiddenuser]

IS it possible to use TP4056 (https://www.aliexpress.com/item/5-pcs-Micro-USB-5V-1A-18650-TP4056-Lithium-Battery-Charger-Module-Charging-Board-With-Protection/32728720869.html?spm=a2g0s.9042311.0.0.A0lkC7) this instead of using the step up booster?
Thanks!!

[gohan]

If you want to use a lipo battery, you need a voltage regulator

[sundberg84]

@hiddenuser - well not out of the box as mentioned by gohan. Im not really sure what you want to do. Its not possible to use this instead of step-up booster since it outputs 5v and the step-up needs to output 3.3v. But with a voltage regulator in between maybe? As I said - don really understand so maybe you can explain some more about your project?

[gohan]

@sundberg84 that tp4056 outputs just the lipo battery voltage

[hiddenuser]

Thanks @sundberg84 and @gohan

I have used made the board for 3.3v set up as per the instruction. I have usd the output from tp4056 into the Battery connector of the board I have a step board from https://www.aliexpress.com/item/New-Electric-Unit-1-PC-NEW-DC-0-8-3-3V-to-DC-3-3V-StepUP/32724361266.html According to the specification given in the same link it is supposed to stabilize to 3.3v above 3v but the sensor reports something else back to the gateway.

[sundberg84]

@hiddenuser - well, what would a battery measurer be if it reported a constant 3.3v boosted voltage? ;)
It all depends on how everything is connected (pictures?) but if you have connected it as battery instryctions the radio and voltage divider that measured the incoming battery are not a part of the booster circuit. This to prevent noice to the radio and to be able to actually measure the battery voltage and not step-up voltage which is the idea behind the board.

[gohan]

@hiddenuser I'm missing how can you use a booster to get 3.3v from a lipo battery

[dakipro]

hey, has anyone maybe made a fritzing drawing/component of the board?
I know, I'm lazy as f but.. since the board is that easy, documenting with it could be easy as well :)

[markjgabb]

@sundberg84 interesting question...or maybe stupid question not sure...

i have a tonn of 3v pro mini's but im thinking of mains powering some for motion sensors.... would i set it up as battery, and then just use a voltage regulator on where the step up usually would be? or is there a better way to handle it?

[gohan]

there is a voltage regulator footprint on the pcb made for that

[markjgabb]

ahhh thats cool... so use regulated instead and it will pull down the voltage for antenna over that side
...and the board can handle the voltage anyway so it should be fine....

[dbemowsk]

@gohan The only voltage regulator that I know of on the board is mainly for the radio. Unless you are talking the one on the pro mini.

@markjgabb If you want to do them from mains power, you might wan t to look at the HLK modules like these
https://www.ebay.com/itm/1Pcs-Power-Supply-Step-Down-Buck-Isolated-Hlk-Pm03-220V-To-3-3V-Module-New-Ic-N/332047987473?epid=571729397&hash=item4d4f9a3311:g:nyMAAOSw4GVYPa8q
Otherwise an old phone charger should work.

[gohan]

@dbemowsk if I remember well the regulator Vout is also connected to the pro mini vcc

[dbemowsk]

@gohan Have a bare board right in front of me. Ran continuity and no connection from regulator V-Out to VCC. VCC goes to the REG jumper and V-Out goes to the BAT jumper. VCC ties to the V-In on the regulator.

[dbemowsk]

@gohan ayou wouldn't want to run the pro mini and the radio both off of that small regulator anyway. Takes too much from the radio.

[markjgabb]

@dbemowsk cheers for that...yeah i have a tonn of old 5v bricks lying around from old nokia chargers, so was just going to try use some of them up without having to buy anythiing else, as i have all of it on hand.... i have some LE33a's which should take care of any step down issues i think?

[dbemowsk]

@markjgabb If you connect your 5V brick to the RAW pin, the onboard regulator on the pro mini will do.

[markjgabb]

@dbemowsk cheers mate, thats awesome...now i can blitz out some room based designs

[hiddenuser]

@gohan @sundberg84
This is my setup. my battery reading is a constant 2.75v, this is not true the multi meter says ~4v

[sundberg84]

@markjgabb @dbemowsk @gohan - I dont have much else to add, thanks for the input here. Using mains power I would also use HLK-PM01 and input the 5v to the pro mini. If you only have 3.3v pro mini you need to input this to RAW. I have made a breakout board for the HLK module if needed as well.

https://www.openhardware.io/view/504/HLK-PM01-breakout-board