DIMP 2 Universal Battery Charger/Desulfator In My Pocket DIY PCB +Chip DA PIMP 2

$20.0 Buy It Now or Best Offer
free,30-Day Returns

Seller Store dchang0
(2373) 100.0%,

Location: Seal Beach, California
Ships to: US,
Item: 335037946106

All returns accepted:ReturnsNotAccepted
Unbranded:Unbranded
Type:Mains Charger

Up for sale is this DIMP 2 « Desulfator In My Pocket » rechargeable battery desulfator/charger/rejuvenator PCB with a genuine ATMEGA48V-10PU AVR chip pre-programmed with version 0.1.0 of the firmware for the integrated voltmeter. This listing is not for the complete kit, just the PCB and one AVR chip.Before proceeding, be aware that once you DIY (Do It Yourself) assemble the DIMP 2 kit, the finished product has a lethal shock hazard. Desulfating batteries can also result in fires, explosions, or acid burns if the battery fails. Stop now and do not buy this listing if you are not willing to accept full responsibility for the assembly, use, or misuse of this kit by you or other persons who will have access to the finished product. The seller, dchang0, and the designer, Silverlake Corp., shall not be held liable for any damages or injury arising from the assembly, use, or misuse of this kit by any persons.Okay, if you are still sure you want to buy these two parts and build a DIMP 2, read the rest of this listing carefully.INTROMikey Sklar designed the DA PIMP 2 (« Power In My Pocket 2 ») based on George Wiseman’s paper « Capacitive Battery Charger » and generously released it to the open hardware community back in 2014.It is capable of charging and desulfating/rejuvenating just about any rechargeable battery of any type, so long as the battery is not totally unrecoverable.After eagerly waiting for Mikey to release DA PIMP 3 for a long while, I decided to design my own with a focus on safety and voltmeter accuracy and call it DIMP (« Desulfator In My Pocket ») version 1.However, after communicating with some fans of DA PIMP 2, it seems that there is a preference for the all-in-one desulfator + voltmeter design of DA PIMP 1 and 2, so I have designed DIMP version 2 with an integrated voltmeter.Here are the differences between Mikey’s DA PIMP 2 and my DIMP 2:Switched to four-digit LED displayRewrote voltmeter code on ATMEGA48V-10PU for four-digit display and improved accuracy at the low endReplaced rare Schurter rocker switch with commonplace OMRON A8L rocker switchReplaced dangerous jumper headers (used to select current output) with C&K L202 slider switchesIncreased max power rating for R1 resistorChanged diode bridge from round to D3K rectangular packageReduced fuse cartridge size to 5mm x 15mm 2AGReduced PCB width to 61mm to fit soap box caseIncreased PCB length to 97mm to fit the slider switches and extra display resistorMoved 9V battery so that it will fit better vertically under the soap box’s domed lidAdded J5 and J6 strain relief holes for 9V battery leadsAdded PCB mounting holes (J4 at top left is at 12.5mm,17.5mm from top left corner, J7 at bottom right is at -4.0mm,-4.0mm from bottom right corner) for 3D-printed housings with screw bossesDIMP version 2 is not open-source hardware, though it has open-source firmware With DIMP 2, it is possible to save hundreds of dollars over several years by rejuvenating rechargeable batteries. Here are the batteries I will extend the life of by a few years because of it:my car’s AGM battery ($200 each–I managed to get 8 years out of one battery rather than the usual 5 years)batteries for power tools ($15 to $100 each, NOTE: pay attention to the pins on the battery pack and be careful not to attach DIMP 2 to any thermal or charge management circuitry found inside some battery packs; connect DIMP 2 to only the rechargeable battery cells.)UPS/battery backup sealed lead acid batteries ($25 to $75 each)Roomba and Scooba batteries ($50 each, but be careful to use only the battery pins, not the pins that lead to the thermistor)rechargeable AA batteries ($2 each–you MUST lower DIMP 2’s output current for AA batteries)Mikey uses his DA PIMP 2 and distilled water to rejuvenate golf cart sealed lead acid batteries for his solar panel system. Watch his video here: https://www.youtube.com/watch?list=PLJMI0k1QWwAmlDuH5HklQXGv5TJa3hrt-&v=2JIzSxqWids&feature=emb_titleIMPORTANT NOTES BEFORE YOU BUY1) This is just the PCB and a pre-programmed ATMEGA48V-10PU chip, not the whole DIY kit. You will need to buy several more parts from Mouser, Walmart, and an unaffiliated 3rd party ebay seller.I have provided a Bill of Materials for Mouser to make it super-easy to order nearly all of the components. The link is here:https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=f993d2cce1Walmart sells the soap box housing in their travel aisle for about USD$1. It is sold under the Equate brand but is manufactured by BOTTLE CREW, which should be molded into the bottom of the case. The PCB is designed to fit this exact soap box case. Other cases might not fit.You can buy the complete alligator clips and 5.5mm x 2.1mm barrel plug cable assembly from various sellers here on ebay. (I am not affiliated with any of them.) Just do a search for « clips 5.5 2.1 » and you’ll see most of them, including some who sell the cable assembly with large car-battery-terminal clips instead. Make sure it is center-positive and sleeve-negative and that the leads can handle up to 5A of current and 250VDC.Why don’t I sell the entire DIY kit? Carrying all the parts in inventory is too costly.2) This listing includes a pre-flashed ATMEGA48V-10PU. I have posted the firmware as free, open-source software at:https://github.com/dchang0/dimp2Check there for new updates. You should expect to have to update your own firmware by flashing the ATMEGA48V-10PU with an AVR ICSP programmer (not included). I highly recommend that you do not buy this listing unless you know how to program and flash AVR chips.You are of course welcome to modify and share the firmware as much as you like under the MIT license.3) Detailed instructions for assembly are over at Instructables. If you can solder, you can assemble a DIMP 2.https://www.instructables.com/id/DIMP-2-Desulfator-in-My-Pocket-2Read the instructions completely before buying this. You will want to make sure you can finish assembling DIMP 2 as well as understand the basic process of desulfation and the dangers it poses.4) Do your own research on desulfating to get the most use out of DIMP 2 and maximize the life of your rechargeable batteries. Mikey and I only cover the very basics of desulfating in our separate but similar instructions. It is a deep science, and DIMP 2 is a tool that needs to be applied properly to get the best results. You should learn about charging voltage and charging current and temperature curves, as well as the rest period between charges. Even I only understand the basics, enough to rejuvenate about half the batteries I come across. There are better desulfators out there, including expensive ones designed for boat batteries. DA PIMP 2 and DIMP 2 excel because they are highly-convenient, pocket-sized ones that are good for triage of rechargeable batteries of unknown condition and brute-force desulfating using a relatively-constant, pulsing current. 5) AGAIN, DO NOT BUY THIS IF YOU ARE NOT WILLING TO ACCEPT FULL RESPONSIBILITY FOR THE LETHAL SHOCK HAZARD AND FIRE, EXPLOSION, AND ACID BURN HAZARDS A FINISHED DIMP 2 PRESENTS. 6) There is no warranty or guarantee of any kind. I’ll do my best to provide technical support (and reserve the right to terminate or deny support requests at any time for any reason). You are expected to be a skilled DIY hobbyist with experience in soldering and diagnosing electronics and AVR programming so that you can perform all repairs yourself. ABOUT THE LISTINGThe PCBs are a uniform glossy white color with black silkscreen.Ships 3oz. USPS Ground Advantage within the USA. International buyers: with the chip in a protective anti-static tube, it is too thick to qualify as a letter envelope and must be shipped as a « package » or « packet. » IMPORTANT UPDATE AS OF 9/2023: Microchip.com, maker of the genuine ATMEGA48 series of microcontrollers, has already discontinued the ATMEGA48V-10PU and several other PDIP form factors of the ATMEGA and ATtiny series. Also, Lite-On has discontinued the through-hole 4-digit red-orange LED display and replaced it with a larger 4-digit bright white LED display that is too big for DIMP 2. As such, these will be the last DIMP 2 PCBs that I list for sale. Sure, you can get ATMEGA48V-10PU and drop-in equivalents and the Lite-On display at several distributors right now, but as the supply dries up, it doesn’t make sense for me to produce more DIMP 2 PCBs. Also, it doesn’t make sense for me to redesign DIMP 2 to use a surface-mount version of the ATMEGA48 since DIYers typically don’t have the magnifier or soldering skills to solder a tiny 28-pin or 32-pin chip. As such, once these DIMP 2 PCBs + chips sell out, the only version of Desulfator In My Pocket that will remain available is DIMP 1, which does not have any microcontroller and thus can still be assembled by DIYers without special tools or skills.

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DIMP 2 Universal Battery Charger/Desulfator In My Pocket DIY PCB +Chip DA PIMP 2

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