[LF686C20] [BL602] Magic Home RGBW 12-24v 5-pin LED Strip Controller
Presenting a familiar device, one I've seen around the forum, but this one is without an Ir receiver and comes with an LF686 chip, which is to be flashed as a BL602.
I spent HOURS trying to get this to flash with my pogo pins and several different USB-TTL adaptors but I only got success after soldering all pads AND pulling BOOT from 3.3v rail on external PSU directly, not via V33 pad and 10k resistor. I also tried v 1.8.8 of the BLDevcube. Success was using 1.4.8.
Ext 3.3v -> V33 pad
Ext 3.3v -> 10k R -> BOOT pad
Ext GND -> GND pad
TTL RX -> TX pad
TTL TX -> RX pad
TTL GND -> Ext GND
Post-flash there was no wifi, even using external 3.3v (and with BOOT unsoldered), but with the external DC jack connected, it all came up. I did not use V+ and GND pads on this board. I have read in another thread that someone had success flashing with 5V on V+.
I tried the device profile of this device but cleared the ir GPIO and used the GPIO Finder to see that pin 20 toggled something on/off
Unfortunately the 4 pin RGB strip I used in testing did not have a W pin and the energizer 5-pin RGBW strip I also have didn't seem to match the RGB pinout, so I'm only reasonably confident this is the correct OBK template (should RGB be 0,1,2 and the W 3 or 4 (there's no C)?):
I spent HOURS trying to get this to flash with my pogo pins and several different USB-TTL adaptors but I only got success after soldering all pads AND pulling BOOT from 3.3v rail on external PSU directly, not via V33 pad and 10k resistor. I also tried v 1.8.8 of the BLDevcube. Success was using 1.4.8.
Ext 3.3v -> V33 pad
Ext 3.3v -> 10k R -> BOOT pad
Ext GND -> GND pad
TTL RX -> TX pad
TTL TX -> RX pad
TTL GND -> Ext GND
Post-flash there was no wifi, even using external 3.3v (and with BOOT unsoldered), but with the external DC jack connected, it all came up. I did not use V+ and GND pads on this board. I have read in another thread that someone had success flashing with 5V on V+.
I tried the device profile of this device but cleared the ir GPIO and used the GPIO Finder to see that pin 20 toggled something on/off
Unfortunately the 4 pin RGB strip I used in testing did not have a W pin and the energizer 5-pin RGBW strip I also have didn't seem to match the RGB pinout, so I'm only reasonably confident this is the correct OBK template (should RGB be 0,1,2 and the W 3 or 4 (there's no C)?):
Code: JSON
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Comments
So it's basically the strip controller from out video but with a different marking on the chip? I'm really curious what is the backstory behind LF686C20, is it made by the same company as BL602? [Read more]
Indeed, but without the infrared option on the PCB and 5 pins. Added after 6 [minutes]: Me too. Maybe I'll email Leapfive and ask. [Read more]
Hi there. First of all thank you for all the amazing work already done! I have a dumb question, but i have to ask it. It's about the external power supply. Can I use the USB TTL as said extenral power... [Read more]
a good question. I have had success flashing a couple of smaller devices when I first started, but now I just use an external (NOT the 3.3v from the USB-TTL) wherever I can to save wondering if my fails... [Read more]
I think i get the idea. I was also looking at a board like that for the power supply, but now i am conviced i will get one to mitigate power issues as you mentioned. In the meantime i will try with an... [Read more]
sure. I have used the 12v DC jack from a standard mains PSU with barrel connector (one I found in a drawer with a connector that fits) for flashing some LED strip controllers. I've yet to blow anything.... [Read more]
It is possible to use Arduino or NodeMCU as both USB to UART converter and a power supply, but in order to do that, you need to put ESP (or Atmega) in the RESET state, by shorting RESET to ground. [Read more]
Never liked electricity so i will skip this scenario altogether :D This I like. This is doable. I will try it. Thank you for the input. Edit: It worked like charm. Arduino mega as ext. Psu put... [Read more]
I may forgot to say that earlier, but if you have LF686/BL602 device and consider flashing it, please take a firmware backup first. I am actively looking for BL602 firmware dumps. Just keep it in mind... [Read more]
Did you manage to backup the firmware for the device in this thread? What is the procedure for backing up a BL602? Can we only flash with bldevcube? [Read more]
I don't know much about it, I haven't tried it yet. There is a similiar thread where user used other tool: https://www.elektroda.com/rtvforum/topic4027953.html As far as I know there is also some kind... [Read more]
ah yes. looks like I downloaded that on the 29th December but immediately forgot, then proceeded to flash the device with OpenBL602. I've another Magic Home BL602 untouched. Here is the boot log attached... [Read more]
and here is a dump deleted. was junk https://obrazki.elektroda.pl/2791223000_1705141343_thumb.jpg blflash-windows-amd64.exe dump MagicHome_LED_BL602_LF686.bin 115200 --port COM10 [Read more]
Is it full dump? This device has 2MB flash, right? Hmm. Maybe you need to specify the size. [Read more]
hmm, unsure. during the dump it does give a progress/total bar. 911.50kib is total. I don't see any size option switches for the exe. I'll play more later https://obrazki.elektroda.pl/2889084600_1705142014_thumb.jpg... [Read more]
So can you try to use this command to dump 2MB? https://obrazki.elektroda.pl/5894231900_1705156934_thumb.jpg [Read more]
Here's the 2MB using deleted. was junk blflash-windows-amd64.exe dump 2MB_MagicHome_LED_BL602_LF686.bin 115200 2097152 --port COM10 . No idea if it's complete. [Read more]
Glad you had success @mavrov. What device did you flash, and are the ones you have all the same? [Read more]
I still haven't gotten around to flashing the rest, so I can make a dump of one of those if you still need it. I just need some docs/links on how to do it, but I can make one before flashing. Added after... [Read more]