virak Posted July 2, 2023 Share Posted July 2, 2023 (edited) So, I got myself a second hand PT01 Scratch for weekends at the cabin, and would like to modify it for 18650 batteries. Is there any reason not to connect this module (12V version) at the main power input and power the PT01 via a cell phone charger instead of the wall wart? https://www.aliexpress.com/item/1005004863246771.html?spm=a2g0o.productlist.main.1.35e71a8ckmZKHE&algo_pvid=a8f74873-a9a0-48ab-aeb3-073978b2e7fc&algo_exp_id=a8f74873-a9a0-48ab-aeb3-073978b2e7fc-0&pdp_npi=3%40dis!NOK!34.8!9.13!!!!!%402102186a16883285157542636d077f!12000030794941186!sea!NO!0&curPageLogUid=AUkllBr44Ph7 I was originally planning on 2x 18650's in series at the battery power input together with a charger module, but this looks almost too good to be true. Edited July 3, 2023 by virak Quote Link to comment Share on other sites More sharing options...
djdiggla Posted July 5, 2023 Share Posted July 5, 2023 Hey @virak The guy that seemed to have the most knowledge on mods like this doesn't post anymore but is still on FB https://www.facebook.com/rasteri I'd contact him if nobody responds to this thread. Sounds like a cool project. If you do it post some pics and stuff! 1 Quote Link to comment Share on other sites More sharing options...
TBearOne8III Posted July 6, 2023 Share Posted July 6, 2023 in theory it should work. i've had plenty of electronics that ive just soldered a wall adapter to the battery terminals just because i was tired of buying batteries. I dont see a reason why this wont work. 1 Quote Link to comment Share on other sites More sharing options...
virak Posted July 6, 2023 Author Share Posted July 6, 2023 Yeah, I've come to the conclusion that I'll simply just buy it and report back. 1 Quote Link to comment Share on other sites More sharing options...
virak Posted July 17, 2023 Author Share Posted July 17, 2023 Parts ordered, now for the long wait. Decided to go for the 9V version and connect at the battery terminals. I've also ordered a bluetooth module, USB-C port, some nice halo switches, a voltmeter, a 9 to 5V step-down board, electronic switch for the BT, some wires etc. Total cost ~$30 2 Quote Link to comment Share on other sites More sharing options...
virak Posted March 3 Author Share Posted March 3 Soooo, six months later... The board works perfectly. Powered through the USB-C port or via 1 or 2 18650 batteries it outputs 9V to the battery wires. I also connected a 9V to 5V converter after the UPS board, which feeds power to the halo light on the start/stop button (a digital switch was already installed when I bought it) and the bluetooth board. The bluetooth board is controlled by a flipflop switch, the button for it has a halo light connected after the flipflop switch, so it light up when the bluetooth board is powered. It' all working fine, except for a quite a bit of interference from the bluetooth board. So I need to sort that out. 1 Quote Link to comment Share on other sites More sharing options...
virak Posted March 3 Author Share Posted March 3 (edited) BTW, there's a LED on the UPS board that lights up when it's powered by batteries. This will slowly drain the batteries, so I removed it. Edited March 3 by virak 1 Quote Link to comment Share on other sites More sharing options...
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