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Messages - Dude72

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PreenFM1 (the blue one) / Re: Finished module with "reversing" encoders
« on: February 02, 2013, 07:06:44 PM »
more pictures

PreenFM1 (the blue one) / Finished module with "reversing" encoders
« on: February 02, 2013, 07:02:06 PM »
Hi all. There was a time, and I ended up the module with "reversing" encoders. Little altered author hull design (in fact, had to make a new drawing.) Different halves of the side and rear panel is parallel to the connectors. Also decided to completely close the display by protective "glass" screen.
Had to work to experiment with modes of cutting and engraving laser engraver to find the optimal mode because up to this point has never had to work with acrylics. Special difficulty caused toning engraved sings.
After studying the experience of experts in engraving I found that the best solution is rubbing acrylic paint with a rubber spatula, then allow to dry for 1 hour and then soaking water and the removal of unnecessary residues of paint with the aid of a wooden or plastic scraper. During the day there comes the final polymerization of paint.
Huge selection of colors available in the shops for artists, including metallic paint type.
I hope that someone useful in my experience, is ready to shell out more photos and drawing files.

PreenFM1 (the blue one) / Re: Encoders question
« on: September 06, 2012, 10:37:16 AM »
These encoders are similar to the feelings that are installed in autoradio or can compare with drum machines Boss DR3, Boss DR880. On a drum machine feel softer because it is used not a knob but the jog-shuttle. On opening one of the encoders I found that they are made with care.
In any case, the main factor is the very low price, which is good for experiments or when there is no certainty that all will turn right. I think the switch is soldered with the left encoder parallel menu button. It will be convenient for navigation: the axis of rotation of the encoder to select the desired menu item, and confirm the selected item by pressing the same knob that is focused on the menu button.
I'm working on the case, I can not finish until I got displays 2004 of normal size - have one of large size with large symbols and make all experiences with it now. Hopefully when finished, then try to upload pictures.

PreenFM1 (the blue one) / Re: Encoders question
« on: September 05, 2012, 09:38:02 PM »
Good day! Tried this special firmware. All is well, it should work: left is left and right is right :). Thank you!

PreenFM1 (the blue one) / Re: Encoders question
« on: August 28, 2012, 05:59:31 PM »
I opened one of the encoders. It has 4 rotating brush contacts, 2 lacerations and one solid home contacts group in a circle.

PreenFM1 (the blue one) / Re: Encoders question
« on: August 28, 2012, 07:46:29 AM »
Unfortunately I do not have the data sheet for these encoders also list that I post earlier. I think that the Chinese are not specifically place the full information about the item.
Most likely, this specification is designed for soldering the encoder on the other side of the PCB.  :)
Furthermore encoders slotted on the axis are more popular than a bevel encoders on the axis because most sold metal knobs on ebay made ​​just under the slot.
I think that this is the reason for which these encoders are so cheap:
Yes, the presence of a special option in the firmware "reverse encoders" would be great.

PreenFM1 (the blue one) / Re: Cheaper chinese clone of Maple mini.
« on: August 27, 2012, 06:11:32 PM »
I don't know exactly. It was my first experience with STM32. I made something like MidiBox FM on PIC18F452 based and megadrum  on Atmega32. And I registered on this chinessian site, bought not bad MIDI interface from there USB 4x4. Anyway I ask technical support when I have no ideas anymore, before this I try and try again, just for get more experiences.

PreenFM1 (the blue one) / Re: Cheaper chinese clone of Maple mini.
« on: August 27, 2012, 05:45:19 PM »
Work as well, really happy becouse I thought about that this product is fake. But really no, just they flash it wrongly. Re-flashing this and resolve the problem.

PreenFM1 (the blue one) / Cheaper chinese clone of Maple mini.
« on: August 27, 2012, 02:15:59 PM »
I tried the cheaper chinese clone of Maple mini:
This is not working properly. First it was not possible to install the driver, the system will indicate that it is not appropriate for the product. Second LED by pressing the reset button did not blink, and is constantly on. Checking the quality of installation and the appropriate circuit device revealed no defects.
Then I tried to re-flash the device to perform as described on leaflabs website using UART adapter but could not understand how to work with Python libraries so used GUI flasher for Windows on ST site. With this program, I did a global erase the device and put firmware file maple_mini_boot.bin to the device. After that, the device manager successfully detected device that came drivers.
Then flash the device on the procedure described on preenfm site by using mini USB cable.
Of course, perhaps the time taken to find a solution is not worth the gain in value compared with the original device, however in my opinion the price of the original device is an exaggeration, is close in value to the development board   :P

PreenFM1 (the blue one) / Re: Encoders question
« on: August 26, 2012, 07:39:50 PM »
I've got other necessary parts. Changed 74HC165N to CD74HCT165. Work well but encoders have other direction "left-right". Probably last firmware of MidiBox FM will explain the problem: other type of encoders, I read about the same on This device have one option "Alt Encoders" for work with other type of encoders. It will be nice make this option in future firmware :)

PreenFM1 (the blue one) / Re: Encoders question
« on: August 16, 2012, 01:02:08 PM »
oh, thanks!
I will try them. Now possible to buy those 10 encoders just for few dollars.
Waiting for the buttons, 24LC512 and 6N137 now. I have already 6N138 and 139. I found that 137 is more good for faster applications. Usually in MIDI interface 6N138 or 139 is enough.

PreenFM1 (the blue one) / Encoders question
« on: August 16, 2012, 09:48:44 AM »
Hi all!
The author uses encoders PEC11-4220F-N0024.
They have the following specification:
Pulses per Revolution    24 PPR
Number of Detents    24
Number of Channels    
Mounting Style    SMD/SMT
Termination Style    
Output    2-bit Gray Code
Shaft Type    Metal Flatted
With Switch    Without

Can I use these encoders: This item 140739970480 on ebay?

They have the following specification:
* Rotary Shaft Length: Approx. 12mm
* Shaft Full Length: Approx. 20mm
* Shaft Diameter: Approx. 6mm
* Size (L x W): Approx. 15 x 11mm
* Output: 2-bit gray code
* Closed Circuit Resistance: 3 ohms maximums
* Max. Rating: 10 mA @ 5 VDC
* Operating Temperature Range: -30 to 70 degrees celsius
* Storage Temperature Range: -40 to 85 degrees celsius
* Rotational Life: 30000 cycles minimum
* Switch Life: 20000 cycles minimum

In the specification there is no information on the number of Detents and pulses. Having made a full turn, I found that the number of Detents is 20.
I understand that the main difference between them is 20 Detents, rather than 24 and the presence of a tact switch.

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