LED Panel 30x7 - Revision history

Buger at 01:54, 29 October 2026

2026-10-29T01:54:14Z

← Older revision		Revision as of 01:54, 29 October 2026
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	Here are some bash examples (to be easy to understand) how to display something on the screen.		Here are some bash examples (to be easy to understand) how to display something on the screen.

	You need RS485 adapter to send data from computer to the module. Alternatively (for testing purposes with short cables) you can use cheap USB-to-Serial adapter connected this way:		You need RS485 adapter to send data from computer to the module. Alternatively (for testing purposes with short cables) you can use cheap TTL USB-to-Serial adapter connected this way (do NOT use ordinary RS232, will not work):
	* GND from USB-to-Serial to pin 1 on XLR		* GND from USB-to-Serial to pin 1 on XLR
	* TxD from USB-to-Serial to pin 3 on XLR		* TxD from USB-to-Serial to pin 3 on XLR

Buger at 01:52, 29 October 2026

2026-10-29T01:52:09Z

← Older revision		Revision as of 01:52, 29 October 2026
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	</syntaxhighlight>		</syntaxhighlight>

	You need MightyCore ~~in your arduino~~ https://github.com/MCUdude/Mightycore and here is the arduino configuration		You need MightyCore https://github.com/MCUdude/Mightycore in your arduino to be able to compile it, and here is the arduino configuration

	[[File:LED_panel_30x7_arduino_cfg.png]]		[[File:LED_panel_30x7_arduino_cfg.png]]

Buger: added info how to connect serial adapter to be able to send data from computer

2026-10-29T01:29:18Z

added info how to connect serial adapter to be able to send data from computer

← Older revision		Revision as of 01:29, 29 October 2026
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	== Show something on the screen ==		== Show something on the screen ==
	Here are some bash examples (to be easy to understand) how to display something on the screen.		Here are some bash examples (to be easy to understand) how to display something on the screen.

			You need RS485 adapter to send data from computer to the module. Alternatively (for testing purposes with short cables) you can use cheap USB-to-Serial adapter connected this way:
			* GND from USB-to-Serial to pin 1 on XLR
			* TxD from USB-to-Serial to pin 3 on XLR
			* put two same resistors (about 1k - 5K) in series, connect one end to Vcc+ (from USB-to-Serial), the other to GND, and the middle of them to pin 2 on XLR
			* this way it will work with the differencial bus, but the range (lenght of the cable) and intereference immunity will be significantly reduced

	=== This example shows the "base48" text on screen with address 0x80 ===		=== This example shows the "base48" text on screen with address 0x80 ===

Buger: /* Flash the FW into the panel */

2026-10-29T00:55:56Z

Flash the FW into the panel

← Older revision		Revision as of 00:55, 29 October 2026
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	* write and verify the firmware using <code>avrdude -c usbasp -p m16 -U flash:w:firmware.hex:i</code>		* write and verify the firmware using <code>avrdude -c usbasp -p m16 -U flash:w:firmware.hex:i</code>
	* done		* done
			* ... the address could be changed using <code>avrdude -c usbasp -p m16 -U eeprom:w:0x80:m</code> in the future without the need of reflashing the main FW again

	== Show something on the screen ==		== Show something on the screen ==

Buger at 00:53, 29 October 2026

2026-10-29T00:53:28Z

← Older revision		Revision as of 00:53, 29 October 2026
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	done		done
	</syntaxhighlight>		</syntaxhighlight>

			Stay 420, have fun!

Buger at 00:52, 29 October 2026

2026-10-29T00:52:09Z

← Older revision		Revision as of 00:52, 29 October 2026
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	* therefore if the device address its for example 0x80, you need to send 0x80, 0x7F, 0x7F, ... and 28 more 0x7Fs to make all LEDs on the panel lid up		* therefore if the device address its for example 0x80, you need to send 0x80, 0x7F, 0x7F, ... and 28 more 0x7Fs to make all LEDs on the panel lid up
	* the device ignores all bytes >=0x80 if they are not its device address		* the device ignores all bytes >=0x80 if they are not its device address
	* the device ignores all graphics data if end of display was reached (means all 30 columns received)		* the device ignores all graphics data if end of display was reached (means all 30 columns received) until it receives its address again
	<syntaxhighlight lang="arduino">		<syntaxhighlight lang="arduino">
	#include <SPI.h>		#include <SPI.h>

Buger: ok, most info there

2026-10-29T00:50:57Z

ok, most info there

← Older revision		Revision as of 00:50, 29 October 2026
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	[[File:LED_panel_30x7_arduino_cfg.png]]		[[File:LED_panel_30x7_arduino_cfg.png]]

	Also here is the compiled firmware in .hex (sorry wiki does not let me to upload is as file...		Also here is the compiled firmware in .hex (sorry wiki does not let me to upload it as file)...

	<syntaxhighlight lang="hexdump">		<syntaxhighlight lang="hexdump">
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	Here are some bash examples (to be easy to understand) how to display something on the screen.		Here are some bash examples (to be easy to understand) how to display something on the screen.

	This example shows the "base48" text on screen with address 0x80:		=== This example shows the "base48" text on screen with address 0x80 ===

			[[File:LED_panel_30x7.jpg\|center\|frameless\|600x600px\|base48 rulezz]]

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	#!/bin/bash		#!/bin/bash
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	</syntaxhighlight>		</syntaxhighlight>

	This example shows simple clock on screen with address 0x80		=== This example shows simple clock on screen with address 0x80 ===

			[[File:LED_panel_30x7_clock.jpg\|center\|frameless\|600x600px\|LED panel 30x7 showing clock]]

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	#!/bin/bash		#!/bin/bash
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	</syntaxhighlight>		</syntaxhighlight>

	Here is a simple pong game for two players controlled with keys Q, A, P, L...		=== Here is a simple pong game for two players controlled with keys Q, A, P, L ===

			[[File:LED_panel_30x7_pong.jpg\|center\|frameless\|600x600px\|pong game on LED panel 30x7]]

	<syntaxhighlight lang="bash">		<syntaxhighlight lang="bash">
	#!/bin/bash		#!/bin/bash

Buger at 00:37, 29 October 2026

2026-10-29T00:37:16Z

← Older revision		Revision as of 00:37, 29 October 2026
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	== Flash the FW into the panel ==		== Flash the FW into the panel ==
	You need programmer able to program atmega16 MCUs~~<code>~~ in DIP40 packages, luckily there is ISP header on the control borad, so I used cheap USBasp to do that.		You need programmer able to program atmega16 MCUs in DIP40 packages, luckily there is ISP header on the control borad, so I used cheap USBasp to do that.

	!!! THE ISP HEADER USE NON-STANDARD PINOUT - DO NOT PLUG STANDARD USBASP CABLE, YOU NEED TO PIN THESE ACCORDING TO SCHEMATIC OTHERWISE USBASP POWER WILL BE SHORTED !!!		!!! THE ISP HEADER USE NON-STANDARD PINOUT - DO NOT PLUG STANDARD USBASP CABLE, YOU NEED TO PIN THESE ACCORDING TO SCHEMATIC OTHERWISE USBASP POWER WILL BE SHORTED !!!

Buger: first usable version

2026-10-29T00:35:44Z

first usable version

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Buger at 00:21, 29 October 2026

2026-10-29T00:21:57Z

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