HTRC 80W use this firmware

[Technicien De L'Extreme]

hey

I found in 2020 a charger compatible with the cheali firmware, it uses an atmega32L

this is a copy of the imax b6

https://fr.aliexpress.com/item/32800729065.html?spm=a2g0s.9042311.0.0.1d286c37wFWu0v

the pins for the programming port is identical to the original.

so i wanted to use this firmware :

cheali-charger-imaxB6-original_2.01-e10.3.12-20170311_atmega32.hex

but there are two problems : the first is the limitation to 50W.

the second problem is the wrong reading of vb1

it works in calibration but during the charge vb1 is wrong about -0.4V

I tried to compile with this line, but the problem moves to vb2

#undef ENABLE_SIMPLIFIED_VB0_VB2_CIRCUIT

so i use this version :

cheali-charger-Dual-Power-B6AC-80W-RC_2.01-e10.3.12-20170311_atmega32.hex

it works perfectly !!!

but there is a new problem, the discharge limit is 10w instead of 5W,the charger became burning, fortunately I saw myself before the destruction.

finally I compiled the dual power 80W version by modifying the discharge to 5W, now the charger works well and is secure.

then I also modify the firmware to modify the order of the "lipo" menu

the first line was "Charge" and I find it dangerous to charge a lipo without balance socket , one day I was going to make a mistake and select this function.

So I moved this function to the last of the list to be sure not to select it by mistake.

hope this helps someone someday

I give you 3 files
-the original firmware of the imax b6 HTRC (copy from my HTRC)
-The firmware change with the limitation to 5W
-the firmware to modify with the limitation to 5W + the "lipo" menu to customize

if you have an 80W HTRC and you use the discharge function, use my firmware

[Frank Steinberg]

Thanks for sharing this information and for providing the appropriate firmware.

I didn't expect to find another suitable charger in 2020, except for the Sky-RC original. The HTRC model is advertised explicitly with the ATMega32. So i was sure that the processor would not be replaced at short notice (this has happened to me with a GOOLRC model). I ordered one right away. After a very fast delivery (Aliexpress dealer who delivered from Poland to Germany), I was able to flash your cheali-variant without any problems.

Frank

[Technicien De L'Extreme]

hey frank
thank you for your message, i ordered a second load and it arrived in 10 days, this chinese seller is fast!

the manufacturer HTRC seems to offer interesting chargers, I would like to make cheali compatible with the htrc brand but I don't have the skills: /

Julien

[David Slipper]

What target did you base your code on ???

I want to build my own version.

Can you send me the modified files (if you still have them) ??

Best regards,

Dave

[diggit]

> so i use this version :

> cheali-charger-Dual-Power-B6AC-80W-RC_2.01-e10.3.12-20170311_atmega32.hex

> it works perfectly !!!

So, OP just took Dual-Power-B6AC-80W-RC config and lowered discharge limit to 5W.

You can edit menu item order here.

[David Slipper]

Many thanks

Dave

[David Slipper]

OK I have just received one of these units and I am pleased to say that it still uses the MEGA32 processor :-)

Before I try playing with the firmware I am testing it and have found that the USB serial output (actually its TTL) seems to be preasent and Logview (LogView_2.7.6.511) sees the serial data in the serial logging window but never produces any graphical data.

I have selected "SkyRC iMax B6" in the device setup.

What am I doing wrong ??

Best Regards,

Dave

[David Slipper]

OK - on further investigation I have found that when in "logging" mode the signal going to the TTL-USB adapter is not pulling down enough. There seems to be a high value resistor in series with this line (>40K!!!) - OK for the temp sensor but not logging.

Taking a seperate logging output from before the resistor works a lot better from a signal point of view.

However LogView doesnt like the data - it seems too long. From what I have found on the web for the iMax B6 it should be 76 bytes, but the device is sending 93 bytes (including the "{" and "}" framing).

Has anyone got the logging working on this variant ??

Regards,
Dave

BTW Has anyone got a LogView (or similar program) that is all in English ??