Looking for quad 7 segment display and resistor board/module

T&E Engineer

I am trying to find a manufacturer of a pre assembled board or module with 4 digits of 7 segment display and resistors. I want to build a circuit like the SX28 DS1620 example circuit. I don't want a serial controlled display as I am trying to do this already with the SX28 DS1620 example circuit. I know that Bean has one with the serial control built in, but I have already gotten the design ready and also need to have decimal point between the 2nd and 3rd digits (e.g. 00.00 or even 0.0.0.0.)

I can find the quad displays as a separate item (just don't want to solder 4 separate single 7 segment displays). Also they must be red and between 0.75" to 1.25" in height.

I could also use a quad display and resistors and solder it to an SX28 proto board IF IT WILL FIT. THAT IS THE MAIN CONCERN.

If a quad 7 segment display won't fit with resistors (and an EEPROM too) on the SX28 board then I will have to use a separate "non serialized" board (if a premade simple display/resistor board exists). I am using the professional development board as a guideline as those are common cathod based.

Any ideas?

Chris Savage

Moving to Sandbox.

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Chris Savage
Parallax Engineering

T&E Engineer

Thanks Chris. I was debating on where to put this because of the SX example circuit relationship or the general LED module usage.

I have about exhausted my mind tonight looking this up on Google.

Any ideas are certainly welcome.

Thanks.

LoopyByteloose

Bean's module has the advantage of remembering the output for you. It doesn't require being multiplexed which takes a lot of the microprocessors resources.

I suspect you will find it difficult to buy a premade module. About the only outfit I know of is Futurlec.com and they can be a bit slow in filling orders. I like them because they still sell a lot of odd ball stuff that is optimal for DIYers. Other companies have decided to keep inventory down at the bare bones.

http://www.futurlec.com/4x7_Segment.shtml This probably isn't what you want. You might just try using Eagle and making your own.

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It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

T&E Engineer

Thanks Kramer.

I look at Futurlec products weekly (although they don't change much). This board is too big (must have digits 0.75" to 1.25") and just have resistors (nothing serialized or micro-controllered).

How about using this on the SX28 protoboard directly? Has anyone done this or is there just not enough room?

Thanks.

LoopyByteloose

Futurlec does have a LED display board with only resistors, but just one LED digit - not a bank of four. Also, it is only a couple of dollars.

IMHO, if you find a digital LED 7 digit display that has a block of 4 digits together [noparse][[/noparse]not each separate], you can easily add the resistors to wire directly to an SX28. IT ONLY becomes a hassle when you have to parallel wire several separate digit units together.

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It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

T&E Engineer

It's looking more like I will have to design my own PCB with 4 larger single 7-segment displays and resistors on a board since I can not find the right size (0.75" to 1.25") in quad 7-segment display - let alone a complete PCB with this already complete.

I·have worked·with ExpressSCH many times but never really designed to ExpressPCB before so this will be a little bit of a learning curve. Anything to watch out for? I will probably need to make at least 10-20 boards with the 7 segment displays and resistors and connector cable to the SX28 proto board.

Any recommendations on a good cable format? I was thinking of male IDC connectors on both the sx-28 proto boards and the 7 segment display boards. A female IDC ribbon cable would connect the boards together.

Perhaps in the future a combo 7 segment display and SX28 board could be fabricated but for now, I want it to be simple to connect to and modular somewhat.

Comments?

Bruce Bates

T&E -

See if this one fits your needs. It only uses ONE Stamp pin to boot, as it's serial input:
http://www.rentron.com/SLED-C4.htm

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Involvement and committment can be best understood by looking at a plate of ham and eggs. The chicken was involved, but the pig was committed. ANON

Bruce Bates

T&E -

Here is a 4-digit display with serial input:
http://www.rentron.com/SLED-C4.htm

Regards,

Bruce Bates

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Involvement and committment can be best understood by looking at a plate of ham and eggs. The chicken was involved, but the pig was committed. ANON

T&E Engineer

Thanks Bruce - That was one of the first one's I looked at. However, I don't want a serial based display and the size of the digits must be from 0.75" to 1.25" in red too. My design is based off of the SX28 Thermometer circuit and code in the help file for the SX-Key. It uses straight resistors to (4) 7 segment displays. I used my professional development board to test this to.

LoopyByteloose

One can use a 34 wire ribbon cable, but only connect 16 wires. The others are just grounded.

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It's sunny and warm here. It is always sunny and warm here.... (unless a typhoon blows through).

Tropically, G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan