Lange lichtkrant
| Project Lange Lichtkrant | |
|---|---|
| Status | Initializing |
| Contact | Sebastius, Maxell |
| Last Update | 2022-05-07 |
Sebastius vond zomaar ergens een hele lange ledbanner. 7 meter lang, 1 regel hoog. Deze is inmiddels (op 29 november 2016) aangeschaft voor 150 euro. Helaas was de behuizing uit één stuk en kon deze niet mee. We hebben de diffusers, ledboards, controller, voedingen en bekabeling.
What
It's a long LED banner, 7 pixels high, very long.
Parts:
20x Ledboard (ca 34,5cm lang per stuk), 5 karakters per bordje 1x Controllerboard 2x 5v 20A voeding 2x Kabelboom 5v 1x Ethernet - Serial brug (Lantronix UDS1100) 1x Serial kabel 4x CDRom met software (Twee CD's hebben de installer van het lichtkrant-programeertooltje (MLN v2.20), verder een Cd met driver en CD met quick guide van de UDS1100 (met papieren boekje!)). 1x Handleiding
Where
Momenteel is dit project opgeruimd, ingepakt in een SAMLA in de lounge. De diffusers liggen in de lounge achter de bank.
Reverse engineering
Each panel is 30 pixels wide, 7 pixels high.
Parts:
- 2x74HC245: 8-bit driver
- 1x74HC164: 8-bit serial-in, parallel-out shift register
- 5x74HC595: 8-bit serial shift register
- 2xSTA402A: quad PNP darlington
Likely the top chain of 595 controls the columns, and the PNP darlingtons on the bottom control the rows.
Power is supplied separately from the 12-pin connector, left of the twin darlingon chips.
Connector (top right):
- 1: GND
- 2: pin U2.B0
- 3: pin U2.B5
- 4: jumper between U2 and U3
- 5: ?
- 6: pin U2.B2
- 7: pin U2.B3
- 8: pin U1.OE
- 9: pin U2.B4
- 10: GND
- 11: ?
- 12: ?
The STA402A transistor base inputs are fed through the set of 7 resistors just left of U3 (595), very likely the row inputs.
The panel has three identical connectors of 12 pins each (they are not electrically identical).
Theory of operation
Possibly the row data is contained in the top chain of 4x74HC595 on top of the board. There are 30 resistors there also, exactly the number of rows.
Actuation of a row is probably done by the drivers inside the twin STA402A. The 595 probably acts as the row selection registers, the twin 245's acting as buffer and twin STA402A's as driver.
It is not completely clear what the 1x74HC164 does.
Foto's
Donaties
Er is meer gedoneerd dan verbruikt. De resterende 50 euro wordt gebruikt om materialen ter montage aan te schaffen.
| Naam/Nick | Bedrag | Betaald? |
|---|---|---|
| Juerd | 25 | Ja, Gebunqerd. |
| flok420 | 5 | Ja, revbank |
| Peetz0r | 25 | Ja, revbank |
| Sebastius | 40 | - |
| Jelle | 10 | Ja, revbank |
| Maxell | 20 | Ja, contant aan Sebastius |
| Crashjuh | 10 | Ja, revbank |
| CFW | 10 | Ja, via RevBank aan Sebastius |
| HansG | 10 | Ja, contant aan Sebastius |
| Smeding | 10 | Ja, revbank |
| merethan | 25 | Ja, revbank |
| Luteijn | 10 | Ja, contant aan Sebastius |