I don’t see the momentary switch. Can you direct me to it? Also…
Top side is where you solder your negative power wire. Bottom side is for positive power wire.
1 Like
You need it in particular on the bottom side because all the mosfets leave you nowhere else to solder the positive power wire.
(please don’t look on the soldering here. No comments please. It’s an old board from the trash can)
1 Like
Ok now i know that it is possible it was easy to swap a bmi160 to a donar board.
The most difficult part was the stm32. All other things worked with a heat gun.
I was lazy and did not add the leds 
A version 2.0.2 with a bmi160 and the v1 firmware on VESC 6.0.5
best Markus,
I will do a video on how to change the bmi but it was very easy!
3 Likes
Nice nice nice nice nice !!!
1 Like
For the stm32 i would recommend micro soldering iron + a lot of flux
1 Like
i do have one it was the aligning part with the microscope
Yup that is the worst part on these ICs
Could we create a separate solderable module for the bmi, like wiznet does for their w5500?
It seems like the easiest way to make it asseblable by everyone.
well there are breakout boards. we would have to rearrange stuff to do it.
maybe a footprint on the backside of the board . so the bmi can be soldered on the front and the board on the backside. That should work. @jens_overby what do do think? I mean the board i added the lin already has all the caps and stuff and just needs to be connected to the SPI of the PILL.
I was thinking custom breakout, so we wouldn’t have to rearrange stuff and it could be soldered directly to the bottom of the pill. If the pcb would be thin enough, we might not need cassellated holes, which make it more expensive
I’ve been searching the schematic, BOM, etc. for the two big caps so I can get their dimensions. Can’t find them. Can you give me the part number or the length & diameter? Also can’t find the momentary contact switch. Is that surface-mount, through-hole, or just a couple of terminals and the switch is mounted elsewhere?
8 Likes
For the caps find one according your voltage, the other parts are max 100V. Take the bigest ones that fit. Lenght should be <= distance from the notch to the ouside. Diameter depends on your case. Something like this but you need to measure, I have an older board with different arrangement:
100V 630uF diameter 16, l30mm
I just found this on AliExpress: US $2.34 | 2-50PCS 35V 50V 63V 80V 100V 160V 200V 250V High Frequency Low ESR Aluminum Capacitor 1UF 2.2UF 4.7UF 10UF 22UF 47UF 68UF 100UF
https://a.aliexpress.com/_EJl3FD8
If you use lower voltage than 20S, ie 16S you can also get 80V caps, just leave some headroom, ~20%.
1 Like
one more thing would be great if we could add 10k resistors connected to ground for adc8 and adc9 . It would be easier to use pressure sensors like footpad sensors.
1 Like
And how are you connecting the footpad sensor now?
at the moment you have to add 2 wires to adc8 and adc9
One wire has a 10k to ground the other goes to the footpad .
1 Like
That would probably be the best solution, yes.
The breakout board also available on ALI:
ALI-bmi160-link
1 Like
