@win7

Printed and assembled the chargers part

And also, I’m in the middle of designing the right side panel, gonna take up a ton of time as I’m using hit and trial method

Completed the modelling part of the inverter case, charger panel and probably also the front panel.
Did some minor bug tweaks in the code
Also finished cutting the copper sheet for the inverter module

TERRIBLE NEWS: I lost 3D models of the main front panel, the inverter case AND the chargers panel to a power outage. I know I should’ve saved it but I either complete it and save it or just have them lying in my RAM overnight till it finishes and that power outages are rare for me, but here I am!

Completed the bench power supply part, printed the front side in orange and screwed it on the gray bench power supply mount since I’m planning to use orange on gray as opposed to gray on orange.

Also added an extra master XT60 connector for direct battery access connections.

Officially over the 100h mark! 🎉

Designed the front plate of the chargers, designed a stencil to drill through the copper sheet that acts as a small ‘heatsoak’, soldered some cables and much more

Did quite a bit of various work today, but the one that made me glad is the successfull printing of the bench power supply part after 5 devastating failed attempts.
Designed the case in Fusion 360
Worked on the header connections
Worked on the bench power supply part

Completed the case for the inverter part, switched to digital operation of the fan instead of analog due to never ending problems.

Completed the addition fan and LED interface to the mainboard. I had to add a separate boost converter to the setup.
Still the addition of fan causes fluctuation in time to empty readings, need to fix them in code,,

Finally completed the haptics part, there are still some areas that do not work like intended, but I cannot really do much about it.
Designed as well as printed cases for the main board and batteries for enhanced safety.
My streak has not extended for today despite 3h of work today.,

Worked on the haptics for quite a while, still need to add haptic feedback/notification for other messages displayed on the screen, though it is SOO BUGGY! I had to work on it for 3 full days, yet I still feel like the haptic patterns were inconsistent, gotta do more fixing tomorrow, or probably I might focus into something else for a while.

Messed up and messed around using millis(), need more time to debug and fix it (I’m not an expert when it comes to dealing with millis(), open to suggestions), I don’t want to use delay() since it interferes with my mAh measurement in the code.

Did a weird contraption of a capacitor, polarity protector diode on a perf board in order to act as a power distribution board since the boost converter had only 1 screw terminal..

I have planned to integrate haptics to the power station too, though traditional ERMs felt too cheap and unreliable, therefore I made something called the “Haptic block”, an LRA (Linear Resonance Actuator)-based haptic actuator, similar to the ones found in flagship smartphones (I’m looking at you, iPhone 6S!). Used a 12V, 6N solenoid along with a MOSFET, resistor and a flyback diode for switching the solenoid with the Arduino board.

It works great, started with the coding process, the timings have to be perfect, else, it feels like metal and plastic colliding (though that’s exactly what’s happening XD).

With perfect timing though, it enhances the user experience by a lot!

Took quite a while to try various methods, debug, fix, etc. the MPPT charging. Finally, a transistor pulling the floating 100mV to ground along with an RC filter seems to work, works for now, though not the best way of doing this.
(Literally screamed in joy when it finally worked lol :D)

A week’s worth of devlog, probably I’m gonna switch over to weekly devlogs cuz I’m a bit lazy. Anyways, once again, a ton of changes:

1. First and foremost, replaced the charger modules and the boost converter (Boy was it expensive for me).
2. Added ADS1115 ADC as I needed an extra analog pin for measuring input charging voltage, switched voltage, current and temperature measurement to there as well.
3. Planning on adding 2 more temperature sensors, 1 for the battery and 1 for the charger modules.
4. Working on charging part for now, gonna use MPPT.
5. A mystery addition that I bet nobody can guess (its in the image btw), open to your guesses btw.

A lot of changes and events.
Spent almost an hour modifying/testing the charging lightning icon on top of the battery.
Fixed the mAh counter
Fixed the time to empty counter
Edited the power value such that only positive values are shown
Killed the boost converter and charger modules, still unsure what caused it but I suspect the boost converter overheating and then finally, a voltage spike killed the charger modules too.
Any ideas/opinions are very helpful..

After 800 lines of code, I finally hit the 2kB RAM ceiling. Did some optimization work on the code. Had to take a backup of the flawless code, try new stuff, in split screen mode between 2 IDE screens

Completed the chargers part (mainly fixed the power measurement bugs).
In addition to that, did the temperature controlled fan part for today, so far works perfectly.

Finally completed the soft-latching power control part in the circuit.

2 Arduino nano(s) were k1lled during the process :*(.
Used an N channel MOSFET at first in order to control power going to the Arduino, failed at it, switched to a relay (big mistake), driven by a transistor, finally got out, bought a P channel MOSFET, still driven by an NPN transistor, and in the end, it works flawlessly, gave me immense happiness watching it work flawlessly :D

Did more soldering work, not the prettiest, has a ton of improvements to be made both on the hardware as well as the software side.
So far, the charger and the inverter switching part works, need to add a transistor in between the system and the battery in order to turn it off completely when not in use..

Open to suggestions and improvements..

Burnt some midnight oil to disassemble the breadboard prototype and start with the actual circuitry, soldered a few components so far, yet there’s a lot more to do so, probably gonna take a month to complete -_-.

Worked on the settings screen for a while. Added maximum power limit as well as basic RGB LED colour setting along with EEPROM memory to store the parameters