Jepp, mine are still working flawlessly. It was one of the best mods that I could do!
In case anyone needs this as well, sharing a guide how to replace stock drivers with TMC2208.
I haven’t tested them long enough, but they are absolutely quiet, which is cool and that makes a lot of difference
So some good resources to go to:
- video how to replace old drivers with TMC2208, most important takeaway - pay attention to their orientation - i.e. make sure DIR and GND pins get to same pins as with previous drivers. Replace when farmbot is powered off.
this table shows jumper configuration for various microstepping setups for both old and new drivers - I went for 2 microsteps per step
my settings before:
my settings now: (you need to set microstepping properly and invert motors)
so far so good, although I have some things to test & followup:
Torque (vs microstepping)
- I suspect the new drivers might have a bit less torque. I have more issues to dig into soil with weeder tool - but - other factors might be influencing this - (soil was more wet and I have changed the tool to bear only the largest blades so it takes more power to put it into soil) Does anyone know (is there a tradeoff between torque and microstepping?)
- TMC2208 have bigger heatsinks and get more hot than the old drivers. Many sources on the net suggest usage of fans. No issues so far, but not enough testing either - and hot season is still about to come. For the time being I kept minimum microstepping (not sure if more microsteps lead to more heat though). Also the voltage is not higher than 1.1 V - not sure if I can set it all the way up to 1.9 V as with the old driver (and if that would create better torque)
if someone knows answers to the above questions - it would be lovely to hear your suggestions
1.9 Volts sounds like a dead driver soon. My drivers are set to 0.8 to 1V, can’t even go much higher, because my motors start to stall when its set too high.
My TMC drivers are in duty since december (1/2 stepping) and I havent had any issues yet with overheating or similar and they are not cooled yet. But my electronics box is not in the direct sunlight what could be a big difference.
There is, as Loveny approved in this post.
Thanks for sharing your experiences and also thanks for sharing your information sources. This might be really helpful if someone wants to change the drivers as we did .
I’ve replaced the drivers on my 1.4 Farmduino and it seems not that there isn’t enough power to move anything. The motors make sounds like they want to move, but do not. Any advise? I’ve measured voltage at the screw and they are at ~1.1v
I had them set too high. all good now
What voltage did you set them to in order to get them back to work?
I currently have them set to ~.88 volts and they are working really well. Using these drivers, farmbot is fast and quiet. I really like them.
@jschneck this behaviour is usually the same when using a4988 drivers.
Glad you still got it
Pictures of the TMC2208 drivers - notice the orientation of the driver on the RAMPS board has the driver potentiometer low, closest to the green power connector.
Heat sinks are to be mounted on the “flat” side, not on the chip - apparently, this a better way to conduct the heat off the chips. A couple of hours of testing and the heat sink for the Z axis never got too hot to touch. The square hole pattern in the center (under the white MC22 and Step ink) is where the heat sink should be mounted.