It really depends which pot has worn out, VR1 could be replaced with a resistor, VR2 would need to be replaced with another potentiometer. Idrisby Moriquendi - General
Quoteo_lampe Is there some inrush/peak current? There shouldn't be, there are no large capacitors but I've only measured the steady current. QuoteValSimDim How do I test the piezo probe range and standard deviation on marlin 1.1.8 (Tevo Tornado printer)? Move nozzle ~2mm from the bed, run G30 20-30 times and record the readings in a spreadsheet which will allow you to calculate range and standby Moriquendi - General
It does mention 180ma but I don't know where that measurement comes from. dc42 will be able to tell you for sure but looking at the datasheet for the uC on the duet it seems that most io pins are only capable of 2-4ma, you need to find one of the 4ma capable pins that's not used for some other essential function. Idrisby Moriquendi - General
I've just measures a v2.x universal board at a maximum of 3.5ma on 5v and 1.8ma on 3.3v. Unless you put a very bright LED on the LED terminals you should be able to run it off any pin, even a low current signal pin. ( I strongly advise you to measure the current draw of your board in your setup before doing so, this has the potential to fry your controller if I'm wrong) Idrisby Moriquendi - General
When you say you get a "great many hits" I assume you're referring to triggers (Led flash etc) rather than the nozzle hitting the print. If that is the case then it's not normally something to worry about, Smoothieware (and all firmwares that I'm aware of) ignore probe triggers except when actually probing. The triggering itself is due to the mass of the hotend hanging off the module and vibratioby Moriquendi - General
Sorry, you've probably told me that before Idrisby Moriquendi - General
Have you seen our titan mount bracket? Idrisby Moriquendi - General
Hi agniusm, Version 1.1 is a significant improvement over the earlier versions, the removal of one of the adjustments and other changes make tuning significantly easier. You will find the manual with wiring and tuning instructions here I put a sticker over the pins to ensure that anyone upgrading from an earlier version is aware that the pinout has changed and to check their wiring before pluggby Moriquendi - General
Only PP20 pcbs have components on both sides and there is no v2 pp20... yet. I'll get a replacement pcb sent out to you asap. Idrisby Moriquendi - General
Hi Danal, Your board should have a model number on it, what you have is a PP20 board so the model number is on the back where the piezo plugs in, it's either a v0.6 or a v0.7. The simplest way to measure the resistance of VR1 is to measure the resistance between the two piezo terminals and as you say it should go up to around 1M, it certainly should read 1M between the two sides of the pot. Weby Moriquendi - General
Sorry for slow replies, it's been a busy week. Nitram, thanks for that, it's very useful. Valantin, wiring is explained in the manual but really all you need to do is supply the piezo board with power (3.3v or 5v to V+ and 0v to GND) and connect the SIG pin to your z-probe signal pin (either Zmin or Zmax, I'm not familiar with the controller of the Tornado) Unfortunately I've not used marlin fby Moriquendi - General
Its not so much polarity protection, nothing gets damaged if the piezo is plugged in the wrong way round, it just doesn't work as well. The clamping diodes protect the circuit from excessive voltage spikes. The advantage of the bridge rectifier would be that it wouldn't matter which way round you plug in the piezos. If you're aware of the importance of piezo polarity it's not a problem, the issueby Moriquendi - General
Any chemists here? I know there are some minerals that thermally decompose releasing CO2 (Carbonates?). Anybody know what temperature decomposition starts at and how much mineral you would need to fill a cabinet with CO2? Idrisby Moriquendi - General
Don't most contact probes use a Renishaw probe? edit, you edited while I was replying, we're talking about the same thing My concern with a single piezo would be that a lateral force on the bolt would bend the disk into an S shape. The ceramic on one side of the disk experiences strain in one direction while the ceramic on the other side is strained in the other direction. The charge generated bby Moriquendi - General
Quoteo_lampe Q: Has anyone used the piezo pcb to probe CNC parts? They often use multidirectional probes. Top/down and sideways. With the right probe head, the piezo would trigger on vertical and also on horizontal touch. You might not need anything more complicated than one disk with a long bolt through the centre, lateral force on the bolt would flex the disk, as would vertical though I'm notby Moriquendi - General
Quoteo_lampe *sh1t*, I just ordered the current universal version.... I had hoped the teething problems were already solved. But if the only new feature will be polarity protection, I can live without... The new features aren't really applicable to the universal board. We have two families of products and they're aimed at different types of customers; The universal board maximises flexibility aby Moriquendi - General
Not if you make it open source you can't, that's kinda the point. I'll do some investigation into the rectifier, however, there are developments coming that might make it unnecessary anyway. Idrisby Moriquendi - General
If you reverse the mechanical direction you also need to reverse the electrical polarity, other than that it'll work fine. Idrisby Moriquendi - General
If in doubt, check the labels on the board. Idrisby Moriquendi - General
Schematic for the v2 boards is here, I could have sworn I posted it on our website somewhere but obviously not.by Moriquendi - General
In theory it should, however, the output current of the opamp is limited and it doesn't drive the voltage up as high as it should. It's a design error but since it's never caused a problem in the past I've not got around to changing it, I'll probably add an output transistor in a future revision. Idrisby Moriquendi - General
Hi Phil, It would appear that you've found an issue with the PP20 and the MKSbase, 3.1v should register as a logic high but perhaps there's more hysteresis on that pin or some form of protection that's interfering. I haven't used an MKSbase but I have been using a Smoothieboard for a couple of years and it doesn't have this issue. Idrisby Moriquendi - General
Are you using a PP20 board (single piezo connection) or a universal board (three piezo connections)? The Universal v2 kit board is active low output, that means that when triggered the output drops to a logic low voltage, somewhere around 2v IIRC. The output pulse is very brief, around 0.3 seconds long, it's very unlikely that you will be able to see a triggered output with M119. If you need toby Moriquendi - General
You can also get much larger 88g co2 cartridges and if even that's not enough you might look at sodastream cylinders or welding gas, I believe both of those have adapters commercially available. Idrisby Moriquendi - General
Quoteo_lampeI'm wondering why you didn't put the piezos in series? You could put the piezo in series but there are some reasons why parallel is probably better; The wiring is simpler, you don't have to run a wire from one piezo to the other, just crimp the two piezos wires together at the connector. I'm going out on a limb here but, a piezo disk is a capacitor, if my understanding is correct theby Moriquendi - General
We all do that, or should do that as a matter of course. However some things are only apparent in hindsight, if something completely unexpected occurs I'd rather have something that deals with the problem caused by an accident rather than relying on predicting every eventuality beforehand. Idrisby Moriquendi - General
I think it's a great idea but I think you may find it requires more engineering than it appears at first glance. My first thought is that you need to be really sure that the thing is still... armed, which to me means either that the bulb is only punctured when the system activates or that you have some sort of pressure gauge to reassure you that the CO2 hasn't leaked away. Idrisby Moriquendi - General
15 amps is almost certainly too much for the heatbed connector too, particularly if it's a cheap Chinese RAMPS. Idrisby Moriquendi - General
That seems to be working perfectly, you've got 26 probes that triggered at exactly the same place so your range and standard deviation are 0. In reality there probably is some variation but the firmware is probably reporting in 5 micron increments. Still, better than 5 micron repeatability is outstanding. Have you printed with it yet? Idrisby Moriquendi - General
We test repeatability by calling G30 from a couple of millimetres off the bed and recording the reading, we take ~20 readings and calculate the range and standard deviation Unfortunately my printer doesn't allow me to easily test groovemount systems but thanks for sharing the files. I'm using a completely integrated piezo effector to reclaim the lost Z-height that comes from mounting the heatsiby Moriquendi - General