I have made lots of equipment with the HCMS-3977 which are serial and you can address each LED. I made my own character set because I didn't like the esthetics of anyone else's. Also I needed symbols like degree, ohm, micro etc. Previously I used the HDLx-2416. Great video.
I probably got my yellow 8 digit displays from the same seller! It was a few years ago and they had lots of 10 displays for somthing like $40 and iirc they had yellow and green ones. I made an offer for 3 or 4 lots for $30 each and they accepted! Unheard of at $3 per display lol! I built a 40x4 character serial module out of 16 of them and it was glorious (and also insane how much current it could pull). I still have a bunch left somewhere just waiting for a project.
Probably my favorite "project" I ever made used 8 of the 8 digit yellow displays for a total of 64 characters. It is a CW (Morse code) decoder display. It scrolls the decoded message across the displays. Makes for a great eye catcher when setting up for amateur radio events like Field Day at the general public information table. There is a radio connected to it at the table that the general public can set down at and spin the dial to find and decode messages. Don't know what it is about CW but it draws people in. Once I added the display I swear it drew in twice as many people as previously.
The red one with the chip inside do I remember from radar test generators, the epoxy cracked over time causing them to be periodic when thermic pulling the bound wires.
The RX TX lights were blinking on the Arduino. Looks like the Serial prints were executing. They slow down the MCU tremendously. What I do is use preprocessors to disable them. On top do a #define SERIAL_OUTPUT and put all the Serial.print statements inside #ifdef SERIAL_OUTPUT and #endif blocks in the code. When not connecting Arduino to a computer anymore, upload the code with the above #define statement commented out (to undefine it). That will remove all the Serial.print statements in the compilation.
If your job were to measure the luminance of an LED pixel in one of those HDSP matrix displays, how would you go about doing so with such a small spot size? i.e. how did HP make such measurments?
These are really quite special, the price has certainly shot up since I used HCMS-39xx parts (for status on an expensive controller board) in the early 2000s. Still available, $50 on DigiKey. There is something really aesthetically pleasing about them... you can get something in the same ballpark with little OLED panels for less than $1, but it doesn't have that same feel :)
@@brainndamage yeah, these led displays are actually quite hardy in comparison. Quite a few of these displays have mil-spec versions used in tanks/planes back in the heyday.
I have a couple of those "very very difficult to drive displays", marked HDSP-2000, '8422' and '720'. Had fun learning PIC assembly code with the help of those 🙂.
I used these in a product in the early 80's. Each unit had 16 devices in one big row. They were great except we had to make strip of metal that would nest under all of them to get the heat out. 2240ish LED's make a lot of heat.
I have 5 each 4-character 5x7 HDLO-2416 removed from their sockets in a control panel for a piece of test equipment. Looks like the one from Mike top middle. Sitting in a box, wish I had a use for them. They are gorgeous and the data sheet is cool to read because of the pre-programmed alphanumerics. They were made in Malaysia and are a Broadcom product. The HDLO is high efficiency red, and features internal or external dimming capability.
Yup, Monsanto MAN4. The whole package is translucent so they look quite nice with light behind them. The Industrial Alchemy website has a page about them
I got a couple of DIP display driver chips I salvaged. At the time they seemed to be expiring the mfr. apparently got greedy or wanted to discourage customer repair work as at the end they were quoting 10,000 $ for them. Well the top and bottom are gold plated though! I considered making jewelry from them as they are worth way more than their weight in gold.
LEDs are cool. But nowadays everything can be simulated by the ubiquitous color display. IMSAI Dog forever PS - I'm always impressed by IMSAI Guy's projects. 👍
nice displays back when LED could not be made very large or bright. And more hardware than software, LCD colour displays IMHO have made lot's of devices unreadable. How many designs do you know with sub 1.5" displays. Got some nice sunlight readable one's, more data in the datasheet for how to cool them. then there is for how to drive them. Without a good heatsink they get too hot to touch very fast.
I never understood why the 7 segment display with the built in decoder didn't become more popular. They were always a niche item and went un-popular rather quickly.
Where does one shop for cool electronics supplies for this? Already had a bad expirience from amazon bought fake schmitt triggers dont wanna spend 10$ shipping on 10$ parts from like digikey
As nice as a Panaplex!! WOW😍 those are lovely! My jaw dropped when you whipped out that box of LEDs. 🤯
I designed a few things with your LED displays back in the early '90s. Also used those backlight LEDs you showed in the previous episode.
"Chip of the day, chip of the day, everyone loves the chip of the day."
I have made lots of equipment with the HCMS-3977 which are serial and you can address each LED. I made my own character set because I didn't like the esthetics of anyone else's. Also I needed symbols like degree, ohm, micro etc. Previously I used the HDLx-2416. Great video.
The yellow variants of these are just gorgeous!
I probably got my yellow 8 digit displays from the same seller! It was a few years ago and they had lots of 10 displays for somthing like $40 and iirc they had yellow and green ones. I made an offer for 3 or 4 lots for $30 each and they accepted! Unheard of at $3 per display lol! I built a 40x4 character serial module out of 16 of them and it was glorious (and also insane how much current it could pull). I still have a bunch left somewhere just waiting for a project.
Probably my favorite "project" I ever made used 8 of the 8 digit yellow displays for a total of 64 characters. It is a CW (Morse code) decoder display. It scrolls the decoded message across the displays. Makes for a great eye catcher when setting up for amateur radio events like Field Day at the general public information table. There is a radio connected to it at the table that the general public can set down at and spin the dial to find and decode messages. Don't know what it is about CW but it draws people in. Once I added the display I swear it drew in twice as many people as previously.
I so remember the HP ones from back in the mid 80’s. We used the super compact 4 digit ones.
The red one with the chip inside do I remember from radar test generators, the epoxy cracked over time causing them to be periodic when thermic pulling the bound wires.
The RX TX lights were blinking on the Arduino. Looks like the Serial prints were executing. They slow down the MCU tremendously. What I do is use preprocessors to disable them. On top do a #define SERIAL_OUTPUT and put all the Serial.print statements inside #ifdef SERIAL_OUTPUT and #endif blocks in the code. When not connecting Arduino to a computer anymore, upload the code with the above #define statement commented out (to undefine it). That will remove all the Serial.print statements in the compilation.
conditional compile commands. they are handy.
If your job were to measure the luminance of an LED pixel in one of those HDSP matrix displays, how would you go about doing so with such a small spot size? i.e. how did HP make such measurments?
I'll try to do a video on that
These are really quite special, the price has certainly shot up since I used HCMS-39xx parts (for status on an expensive controller board) in the early 2000s. Still available, $50 on DigiKey. There is something really aesthetically pleasing about them... you can get something in the same ballpark with little OLED panels for less than $1, but it doesn't have that same feel :)
OLED also suffers from terrible burn-in so I'd never use it for something designed to run for a long time
@@brainndamage yeah, these led displays are actually quite hardy in comparison. Quite a few of these displays have mil-spec versions used in tanks/planes back in the heyday.
I have a couple of those "very very difficult to drive displays", marked HDSP-2000, '8422' and '720'. Had fun learning PIC assembly code with the help of those 🙂.
I used these in a product in the early 80's. Each unit had 16 devices in one big row. They were great except we had to make strip of metal that would nest under all of them to get the heat out. 2240ish LED's make a lot of heat.
I have 5 each 4-character 5x7 HDLO-2416 removed from their sockets in a control panel for a piece of test equipment. Looks like the one from Mike top middle. Sitting in a box, wish I had a use for them. They are gorgeous and the data sheet is cool to read because of the pre-programmed alphanumerics. They were made in Malaysia and are a Broadcom product. The HDLO is high efficiency red, and features internal or external dimming capability.
The red, gold-pinned DIP package you show at the end looks very much like a Monsanto MAN-4. I do recall that TI sold similar ones later on.
Yup, Monsanto MAN4. The whole package is translucent so they look quite nice with light behind them.
The Industrial Alchemy website has a page about them
I got a couple of DIP display driver chips I salvaged. At the time they seemed to be expiring the mfr. apparently got greedy or wanted to discourage customer repair work as at the end they were quoting 10,000 $ for them. Well the top and bottom are gold plated though! I considered making jewelry from them as they are worth way more than their weight in gold.
LEDs are cool. But nowadays everything can be simulated by the ubiquitous color display.
IMSAI Dog forever
PS - I'm always impressed by IMSAI Guy's projects. 👍
I got a bunch of these from scrapping early mobile (cell) phones. Kinda wish I'd kept the phones intact now after seeing what they sell for on eBay.
nice displays back when LED could not be made very large or bright. And more hardware than software, LCD colour displays IMHO have made lot's of devices unreadable. How many designs do you know with sub 1.5" displays.
Got some nice sunlight readable one's, more data in the datasheet for how to cool them. then there is for how to drive them.
Without a good heatsink they get too hot to touch very fast.
I never understood why the 7 segment display with the built in decoder didn't become more popular. They were always a niche item and went un-popular rather quickly.
You're such a silly goose.😂
Where does one shop for cool electronics supplies for this? Already had a bad expirience from amazon bought fake schmitt triggers dont wanna spend 10$ shipping on 10$ parts from like digikey
sorry, legit places like digikey and mouser will have to charge standard shipping. if small order you can choose USPS shipipng for about $7 on digikey
and where is the schematic of the board itself or a description of how you connect to NANO?
Is there a link?
sorry, I seem to have lost info on that
I have some like the second(left to right) red one from 2:19
Pretty cool, right? I think they are just as sexy as NIXIEs and don’t require high voltage.
Me to 😊 TIL311 or something?
Chip of the day? More like led memory lane.