Apollo uDSKY’s Registers Sign Digits

Working!

This board will allow a pretty good substitute for the non-existent compatible LED sign digits for an Apollo DSKY display. You will also need the DS_MASK.brd for each display if you want the displays to be more segment-ty? There are also some additional masking and diffusing techniques that can be done to make these look really good.

NOTES:

This is intended to be used with a 0.39" 10-pin LED displays such as LTS-4301G that were used on the uDSKY display.

The minus (-) are controlled by the standard G - Segment Pin 1 with 2 LEDs in series. The (+) is a combination of the “g1” and “g2” Segs and the vertical segments (some times referred to as “h” and “J”) which are connected to the “DP” pin 6. The Common pins are 8 and 3. Because both displays are two LEDs in series this should simplify non-MUX displays as well.

https://www.jameco.com/z/LTS-4301G-Lite-On-Electronics-Green-7-Segment-LED-Display_2227911.html

When selecting the SMT LEDs make sure you get them close to the brightness and color wavelength. For example , these LED displays have: 569 nm (green) and an avg. intensity = 2200 µCD @ If =10mA.

I will post some details on how to put these together. But basically, you need to diffuse the light or the viewing angle gets critical. I used a simple piece of scotch tape but hot melt glue may also work. A couple of baffles between the G and the vertical segments are also needed or when only (-) is displayed the other segments are still slightly visible. I used a couple scrap pieces of black wire insulation wedged between the segments to block this.

The parts placement is pretty simple, The anode of the first LED connects to the respective pin. The two LED’s cathodes and anodes for each segment are connected together. The cathodes of the 2nd LEDs connect to the common pins. If you forget one LED or get one in backwards… no light! The Eagle Files are at:

https://github.com/b-wave/uDSKY/tree/master/uDSKY%20Hardware/DSKY_DISP

Use two 0.1" 5-pin headers to hold the two boards together. Mount the header on top of this board (long pins go thru the board) Then put the mask board on top of the header. The boards are separated by the plastic header. Push the pins flush to the top MSK_Brd Pins 1, 6, 8, and 3 now have to be soldered on the bottom of this board. You can solder the mask board’s pins all in place if you want to - after you verify everything is working OK of course, there are no electrical connections.

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A full description, BoM, and project notes are available at http://www.RV-project.com/projects/cyloneye.php

MINI DSKY Sign digit light mask

This board is the mask board for the sign displays for R1, R2 and R3 on the Apollo uDSKY project. You will need 1 ea. for each display. DS_PLUS1.brd

https://github.com/b-wave/uDSKY/tree/master/uDSKY%20Hardware/DSKY_DISP

This board implements a classic Z80 microprocessor test circuit. All data pins are pulled low, causing it to execute the NOP instruction $00 repeatedly. The program counter increments and the activity on the address lines is visualized using LEDs. A slow clock signal is applied to make the address bus activity slow enough to see.

The MREQ and RD pins are also brought out to LEDs. Push buttons are available for the RESET and WAIT lines. The clock signal is generated using a 555 timer.

The board is powered by applying 5V to the 0.1" header pins. Reverse polarity protection is provided using a P-Channel MOSFET.

This board is mostly a novelty. It’s really cool to see the program counter increment on the address pin LEDs and the MREQ and RD LEDs flash. It is not possible to execute an actual program on this board, as it has exactly one byte of “memory” with the contents $00. :)

BOM

• U1: Zilog Z80 40DIP
• U2: 555 Timer 8SOIC
• Q1: Alpha & Omega AO3401A P-Channel MOSFET SOT-23 or similar
• R1-R19, R21-R22: 1k 0603
• R20: 22k 0603
• C1: 10 uF 0805
• C2, C5: 1 uF 0603
• C3-C4, C6-C7: 100 nF 0603
• RN1: 1k, 8 resistor (9 pin) SIP
• A0-A15, MREQ, RD: 0805 SMD LEDs (colors of your choice)
• RESET and WAIT switches: SPST tactile switch Through hole
• 5V header: 1x2 0.1" standard header pins

Notes

• R20, R21, and C5 set the 555 clock signal frequency. The values provided above will set a clock of approximately 32 Hz. You can use an online 555 calculator to pick different values and adjust the clock frequency as you like. In relation to the classic 555 circuit schematic: R21 on this board = R1, R20 = R2, and C5 = C.
• Brand new Z80 microprocessors are available on Digikey if you don’t have one.

Eagle Files

https://github.com/SyncChannel/Z80-Test-Circuit

Other References

http://www.z80.info/z80test0.htm

https://z80project.wordpress.com/2014/02/09/z80-test-circuit/

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