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MikeO
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Joined: 11/09/2011
Location: Australia
Posts: 275

Posted: 12:13am 05 Jul 2015

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Just using one of these Nokia 5110 displays on a mite for the first time and It appears to be completely dead. I have checked the wiring and also monitored all the I/O , all seems OK, program running, SPI clock,SPI out and data command are all pulsing, chip select low , reset high. Just come to the conclusion it is DOA. Just wondered what others peoples experiences have been, reasonably common or I have just been unlucky? I have ordered new one anyway as two far into the project now.

Mike

Codenquilts

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10277

Posted: 07:06am 05 Jul 2015

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Try changing the value of the contrast data. &HB9 or even &HBF might make a difference

Edited by matherp 2015-07-06

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 1990

Posted: 11:19am 05 Jul 2015

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I bought 3 of them, all worked OK but after continued use ( about 10 hrs/week for about 6 months) one of them went dark and was hard to read. I replaced it and now OK again.
Paul.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

CircuitGizmos

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Joined: 08/09/2011
Location: United States
Posts: 1427

Posted: 06:41am 06 Jul 2015

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http://www.instructables.com/id/Servo-Tester-with-Graphic-LCD/
Edited by CircuitGizmos 2015-07-07

Micromites and Maximites! - Beginning Maximite

nibbler
Newbie

Joined: 18/04/2013
Location: Canada
Posts: 11

Posted: 09:00am 06 Jul 2015

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Nice servo tester. I've just been connecting servos to a receiver and eye-balling them. This is a great little project. I would probably put it in a project box. A PCB would be nice but isn't worth it just for one unit.

Have you given any thought to testng modified servos that don't stop but rotate right around? Obviously they're not for R/C use.

Alan

CircuitGizmos

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Joined: 08/09/2011
Location: United States
Posts: 1427

Posted: 10:18am 06 Jul 2015

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It'll work just the same with the modified servos. Position offset from the center (1500) will just be speed and direction.

Micromites and Maximites! - Beginning Maximite

MikeO
Senior Member

Joined: 11/09/2011
Location: Australia
Posts: 275

Posted: 06:30pm 10 Jul 2015

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I was using 4.7b8 when I first reported this issue, I got some new displays thinking I had a dud however I still had the problem. I then tried 4.6b and of course it worked (should have tried that a week ago). It seems that with the change to the SPI Open routine in ver 4.7b8 that you have to let it handle the CS (not as suggested in the manual) by setting the optional argument and removing the I/O control of the Chip Select from within the program. Once you do that the display works as expected.

Codenquilts

paceman
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Joined: 07/10/2011
Location: Australia
Posts: 1329

Posted: 08:24pm 11 Jul 2015

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Geoff changed the SPI Open method in the V4.7b11 release here which should have fixed this. The other bugs that turned up in beta 11 though made it problematic so he quickly recommended going back until he has time to sort it out properly.
Not sure if the MicroMite+ f/w has it sorted but that wouldn't help with an MX170 build anyway.

Greg

MikeO
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Joined: 11/09/2011
Location: Australia
Posts: 275

Posted: 12:14am 12 Jul 2015

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Thanks Paceman, I will stick with 4.7b8 at the moment as its working fine with the Open SPI controlling the CS line. I can always revert to the program controlling when a more stable versions comes along.

Mike

Codenquilts

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