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Re: MAXESP3 - 12v Regulator

Ken Hunter
 
Edited

[EDITED]

I can see why he is not measuring 3.3V at the anode of D4 or D5...
0.5V seems reasonable considering the Cathode is at GND potential.


Re: MAXESP3 - 12v Regulator

markarose@...
 

Hi Drew, thanks for clearing up the Wemos 3.3v thing, currently checking over everything I can think of especially the 3.3 line.
Don't have an LED in D2 but will check the contact points.


Re: How to synchronize absolute encoders?

 

Thank you Howard for these clarifications.

I just found the problem by looking at Thomas Westterhoff's post on the question "Problem with absolute encoder AS37".
I looked at the value of "define AXIS1_ENC_TICKS_DEG 22.22222" in config.h from SWS. There is a period (22.2222) and on the Encoder tab of the SWS page in "Encoder Configuration: Axis 1 RA / Azm" there is a comma (22.2222).
I put a point; but the result was the same. So I decided not to put anything either: 222222. And there, miracle! the sync between Axis1 (and Ax2) of Onstep is automatically synchronized with Ax1 (and Ax2) of Encoder.
After a sync on the sky map, the gotos were performed normally.

I will do some tests on the sky ... when the weather permits!


Re: MAXESP3 - 12v Regulator

Drew 🔭📷🚴‍♂️
 

On Tue, Oct 26, 2021 at 02:00 PM, <markarose@...> wrote:
Everywhere is showing 2.72v except the Wemos D1 Pro which has 3.3v. Cant see on the EDA where that 3.3v comes from.
Again, the 3.3v regulator is on the ESP32 chip/module. Pull it and the 2.742v will disappear. The Wemos D1Pro has it own 3.3v regulator, that is what you are measuring there, it has no connection to the main board..

It sounds to me like you have something loading that regulator or a bad ESP32 chip. Look for problems wherever the 3.3v is used. Pull the drivers and see if it changes. Look at the status led (D2) and circuit around J2, for example.


Re: MAXESP3 - 12v Regulator

markarose@...
 

Just making a start testing things out on the 3.3v line. Everywhere is showing 2.72v except the Wemos D1 Pro which has 3.3v. Cant see on the EDA where that 3.3v comes from.

With the DVM set at 200 Ohms I read 175 one way and 1(on the left side, presuming it means OL) switching probes.


Re: MAXESP3 - 12v Regulator

Ken Hunter
 

In that particular circuit the caps are connected directly across the diode so you CAN test the diode in circuit... If you read a direct short then get a different reading when you switch the probes... it is not a direct short.  This eliminates the soldering or a shorted capacitor which will give the same results when switching probes. Getting a different reading when you switch the probes points to a semi-conductor being biased on and off when probe switching. The only semi on that side of the Regulator is D5 (assuming no driver is installed as you previously posted). Remove it and your short will disappear. As I said earlier, I  have seen them mis-marked occasionally. You can replace the SMD diode with a similar spec axial lead since the MaxESP3 pcb is set up for both types.

Interesting problem... keep reporting what  you find to help the next guy.

Note: Experience is a GOOD thing... it helps you recognize a mistake when you make it again!


Re: Bluetooth

marorte otero
 

Thanks a lot, Drew already set up, it's going great. All the best


Re: Bluetooth

George Cushing
 


Re: Wemos r32 cnc v3 + ds3231 +WeMos D1:GoTo error

Khalid Baheyeldin
 

Did you test the mount to see if the motors are turning in the correct direction?

To test this, use the commands at the last section of this page, from Arduino's IDE Serial Monitor with 9600 baud.

You can reverse the direction of the motors by rewiring them, or set the REVERSE parameter on.


Re: MAXESP3 - 12v Regulator

markarose@...
 

Hi George, thanks for the reply. Probably not the diodes then, will check again later. I reckon my soldering is pretty neat but maybe some got between the pins under the female headers, Will check adjacent ones for continuity.


Re: Bluetooth

Drew 🔭📷🚴‍♂️
 

Sorry, didn't realize we had most of the needed information from previous posts. Set SERIAL_C_BAUD_DEFAULT to ON. You should then see an "OnStep" bluetooth connection become available.


Re: Bluetooth

Drew 🔭📷🚴‍♂️
 

We need more information on your OnStep setup. OnStep board you are using and the OnStep software version. Also, attaching a copy of your config.h would be helpful.


Re: Teensy3.2, MiniPCB1, TMC2130; Problems and error messages when compiling...

George Cushing
 

I think that Howard meant to reload OnStep from GitHub. Make sure you have the latest version of Teensyduino.


Re: MAXESP3 - 12v Regulator

George Cushing
 

I install the SMD diodes for the Max kits as most folks aren't set up for reflowing them. You can check them with you DMM's Ω meter or its diode tester. When the positive probe is in contact with the anode and the common probe with the cathode (the scored end of the diode) you should get a reading. When the probes are reversed the meter should read "OL." The diodes are Schottky 40V, 1 amp. As mentioned their purpose is to handle back EMF from the motors that can trash some drivers.



If your caps are the wrong polarity they would have blown very quickly and with a loud report. I'd check them for a short through the cap. It's possible they were damaged by the short. But there's a short somewhere. Examine the solder points with a magnifier. It doesn't take much to foul things up. If all else fails check adjacent pins for being shorted. I've seen female headers where adjacent connectors were in contact. I recently had a bad driver that caused a short. Went thru 5 fuses before I tracked that down.


Bluetooth

marorte otero
 

Hello very good, to connect to bluetooth do you have to modify something in the config.h? All the best


Re: How to synchronize absolute encoders?

Howard Dutton
 

This Wiki page has a section with description of encoder operation: Control

Set absolute encoder zero is for the infrequent manual sync of absolute encoders from OnStep.  After that syncs allow for only a AXISn_ENC_DIFF_LIMIT_FROM distance.

Absolute encoder support is experimental.


Re: How to synchronize absolute encoders?

 

In the OnStep Web interface, there is an "Encoders" tab. Can you tell me more? When I click on "Sync OnStep to Encoders" nothing happens in the "OnStep status" tab. When I click "Sync Encoders to OnStep", in OnStep Status, Encod: Ax1 and Ax2 take the values ​​of OnStep: Ax1 and Ax2.
I have the impression that we can synchronize OnStep to Encoders but not Encoders to Onstep. Could someone explain to me? and what is "Set Absolute Encoder Zero to OnStep" for?


Re: MAXESP3 - 12v Regulator

markarose@...
 

Thanks Ken, I had an inkling that it might have been the diode but the only real way to check is to unmount them. Will look at replacing D4 and D5 if I can find the right parts.


Wemos r32 cnc v3 + ds3231 +WeMos D1:GoTo error

MOD T
 

Hi, 

I use Wemos r32 cnc v3 + ds3231 +WeMos D1 mini and tested GoTo but it pointed to incorrect position.

Tried select Sun and press GoTo. Position on Onstep Alt:50.7deg, Azm:130.6deg
but telescope pointed to Alt:27 deg, Azm :65deg.

Location & Time already set as I per Android time & location. 
Connect with WiFi 
Onstep 4.24 
Wemos r32 cnc v3 + ds3231 +WeMos D1 mini
Lv8729 
Mount Vixen Super polaris. 

Please tell me what I have missed.
Thank you. 

Mod, TH. 



Re: MAXESP3 - 12v Regulator

Ken Hunter
 

Well, with 2 different readings it ain't directly shorted! Your readings are bogus though. You need to measure across the diode with the meter in Diode mode or the lowest range you can. MegOhms will be effected by the capacitor leakage current and is heading you in the wrong direction. In Diode mode you will be able to Identify the cathode fairly easily.

In my MaxESP's, measuring just across the diodes, I typically see OVER RANGE with the Red meter lead on the Cathode and around 0.2-0.3V with the Black lead on the Cathode end. Of course the other meter lead is on the other end of the diode. BTW, I mistyped the D4 yesterday - the 12V diode is D5 and may be removed if you don't mind fussing with surface mounted devices to do the test.

Since you have 2 different readings, that takes a direct short out of the possibilities and points directly to a semiconductor, the diode being the only one in that circuit.

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