Otto Winter
A new rDUINOScope Version with 4 Inch TFT (480x800) is born!
At the middle / end of Feb 2020, it can be ordered in diff. configurations!
The improvements, compared to the prior HW Versions are:
1.) TFT resolutions goes from 240x480 to 480x800 pixels with much more details!
2.) The new 3.97 Inch IPS TFT has a better vewing angle ( ~ 80 degrees in all directions ).
3.) The new TFT is several times faster than the old one (3.2 Inch) Version.
4.) Several new Software improvements are implemented.
5.) Using an external ( 3.3V rs232 ) GPS module for better sensitivity!
6.) All observed Sky-Objets has an own picture on the Display!
7.) 16 GByte Flash Memory for User extensions (Sky Data & pictures).
It is not unknown that the RESET routine of the Arduino DUE does not work properly.
I have tested a circuit that fixes this problem. As seen in the photo, after switching on the operating voltage, it takes more than 150mS to reach the voltage of fully 3.3V level.
In the CPU integrated RESET routine starts already after approx. 3mS!
This very short Master_RESET delay is the reason, why the Controller starting mostly with blank Screen!
The RESET Circuit I've created, works properly and in the next Version of the Controller it will be integrated.
It generates a delay for Master_RESET with about 150mS and the Controller running fine, after we switching the Power on...
In the future Controllers, I'II use the MAX803R Chip with the same delay time...
https://datasheets.maximintegrated.com/en/ds/MAX803-MAX810Z.pdf
It is a SOT-23 Chip with 3 Pins and can easy soldered on the older Controller Boards too!
For those who can solder such small parts, see the picture below:
The new enhanced Motor Driver is reloaded, up to 24V input Voltage for the stepper Motors...
The version from 3. Sept. has an input voltage capabilities from 15V up to 24V!
This driver Board is only compatible to the Main Unit V1.4c and later!
Here the Videoclip of the prior Version of the Driver Board:
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I've a suitable cable for the stepping motors manufactured.
It can be loaded with 1A / contact, which means 4A / motor!
The max. outer diameter is only ~ 12,5mm.
This Connectors are maded for Aviation and they are watheproof!
You need only to drill two holes with a diameter of 8mm in your case...
For disconnecting, you need only to pull back the outer Shell and pull the cable a way!
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The finished version V1.4d is ready to use, you need only 2 NEMA17 mounted on your Telescope and let it run!
It can be ordered as full assembled version included the programmed and tested Arduino DUE
+ Bottom holder aluminium plate with two cables (~ 50-60cm long) including a 5V Fan 25x25x7mm.
The price will be 325 CHF (Swiss Currency) including PayPal fee and shipping costs.
This is the latest and finale Version of the series V1.4x!
The enhanced Version V1.4d is finished and can ordered after 20. Oct. 2017!
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The enclosure is only a prototype and can ordered some weeks later...
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The next Version V1.4.1 brings some more enhancements, like new Joystick with high accuracy digital intrface for a very precise manual aligning of your Telescope!
The whole height of the device will be only 28.3mm!
The bottom side of the housing is made of 1.5mm aluminum and is used as heatsink for the motor drivers!
It could be operated without a fan...
This Version is planed to finished and could be ordered, probably at the end of this year.
The price for the assembled and tested Controller, without enclosure cost $205 including the shipping costs.
For the Version wiht...
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The assembled unit must be tested with rDUNOScope Firmware 
Karol
Tim Wilkinson
Josh Pieper
Vitaly
Also, are the custom boards OR completed units for sale?