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Re: Display Advice
John
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First point - The display Normally used for T41 have the RA8875 controller, not RA8876.
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Second point - As mentioned by Terrance the post on PJRC forum speculates RA8876 and LT7683 controllers are compatible. (This point is probably superfluous)?
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Third Point - Larry says the LT7683 type displays work with the T41.
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Fourth Point - The display you have, (type 7, i.e. ER-TFTM070-7), the wiring on Pins 1 to 8 of the 40 pin IDC (including power and SPI) is identical to the RA8875 type displays like ER-TFTM070-5V4 7" display.
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I would give your LT7683 display a try, wire it the same as the Schematics say and see what happens. Remember, you can test the display with just the main board working.
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Keep in mind two things:
1.? Your display is 5 V, remember to configure your main board J8 for 5V display.
2. Use a very short ribbon cable (>3" long) if you omit using DR. Bills display driver board at first.
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This is what the first test cable I used to test the display looks like.
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Regards?
Phil
VK2KKZ
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On Tue, Apr 29, 2025 at 11:48 AM, John Owens K1JO wrote:
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Re: Display Advice
I went ahead today and ordered two 7" RA887, 4-wire SPI, with Capacitive touch. Hopefully, the tariff won't kill me.
Larry, you said that you use the LS7683 controller display on your T-41 radio. How did you connect the SPI? My connectors are shown on the ER-TFTM070-7_Datasheet.pdf page 11-2, that I uploaded here at Files > BuyDisplays DataSheets. Are yours the same? Best regards, John K1JO |
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Re: Display Advice
Did you check for an LT7683 library? Jack, W8TEE
On Monday, April 28, 2025 at 12:17:57 PM EDT, W1SIM via groups.io <w1sim@...> wrote:
I have an LT7683 chip on the Buy Display board that I bought 1 or 2 years ago.?? If I recall correctly, Buy Display said it was compatible with the RA8875.? The board does run the T41 software and other software that uses the RA8875 driver.
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-Larry
W1SIM
-- Jack, W8TEE |
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Re: Display Advice
开云体育Ok… I just don’t have any experience with the LT part.? It may, in fact, work… ? Has anyone tried it that can report? ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of W1SIM via groups.io
Sent: Monday, April 28, 2025 11:18 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Display Advice ? I have an LT7683 chip on the Buy Display board that I bought 1 or 2 years ago.?? If I recall correctly, Buy Display said it was compatible with the RA8875.? The board does run the T41 software and other software that uses the RA8875 driver. ? -Larry W1SIM |
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Re: Display Advice
开云体育I doubt it… no telling how different the RA8875 and LT7683 chips/ libraries are.? You should use a display that has an RA8875 controller chip and SPI connections. ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Monday, April 28, 2025 7:45 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Display Advice ? Looks like it will be a lot of work, even if I can find a LT7683 library for the Teensy4.1??? |
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Re: Display Advice
开云体育As long as the board uses a RA8875 controller chip… it will work no matter what it is.. ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Monday, April 28, 2025 6:04 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Display Advice ? Thanks Bill and Phil, The BuyDisplay China office was quick to send me the datasheet for the three displays that I purchased. I have uploaded them here at Files>BuyDisplays DataSheets. I am trying to use the 7" version which is ER-TFTM070-7. The board is not like the one you attached above. Here is the one I have: It says the controller is the LT7683, see below. Hopefully, I can connect it up, as the site is reporting that the new tariff are in our court :( |
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Re: Display Advice
Thanks Bill and Phil,
The BuyDisplay China office was quick to send me the datasheet for the three displays that I purchased. I have uploaded them here at Files>BuyDisplays DataSheets. I am trying to use the 7" version which is ER-TFTM070-7. The board is not like the one you attached above. Here is the one I have:
It says the controller is the LT7683, see below. Hopefully, I can connect it up, as the site is reporting that the new tariff are in our court :(
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Re: Display Advice
开云体育“but it the layout of the board is different than the one they sent me” ??? ? Then its probably a different REV than whats on the sheet.? I’m not sure that matters.? I have multiple 5” and 7” displays from BuyDisplay that are different REVs.? Some look different and have different connection arrangements, BUT… they all work the same way. ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Sunday, April 27, 2025 2:52 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] Display Advice ? Hi Bill, Hope you have a nice trip. John K1JO |
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Re: Display Advice
开云体育The display driver kits will work with any display that is SPI interfaced.? ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of John Owens K1JO via groups.io
Sent: Sunday, April 27, 2025 1:16 PM To: [email protected] Subject: [AmateurRadioBuilders] Display Advice ? After a year of emergencies, I am back at trying to put together a T-41. I purchased the following display from BuyDisplay.com, but do not know if it will work with the T-41. Also, I got the new Display Driver from Bill and don't know if I need that for this device.? Any direction or advice will be greatly appreciated. Low Cost 7 inch TFT Touch Display Module for Arduino I2C/SPI Interface
Interface Pin Header Connection-4-Wire SPI Power Supply (Typ.) VDD=5.0V Touch Panel(Attached by default) 7"Capacitive Touch Panel with Controller MicroSD Card Interface Pin Header Connection
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Re: Display Advice
Hi John
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Does your board look like this:
This board is the 7", type 5 ver4.
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Does the Big Chip on yours have RA8875 stamped on it??
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It's possible the display you ordered has the wrong controller - from what I've seen the type 7, i.e. ER-TFTM070-7 has a LT7683 controller which is probably not compatible.?
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Can anyone else comment on this controller chip?
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Regards?
Phil
VK2KKZ
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Re: Display Advice
开云体育Hey John. ?There is a directory on my Github with displays that work with the T41 (sorry im traveling).Www.github.com/drwjschmidt Just dig around Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com email:??bill@... ? On Apr 27, 2025, at 1:16?PM, John Owens K1JO via groups.io <johnowenschina@...> wrote:
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John Owens K1JO
Jack, W8TEE
K9HZ