Categories

Cheap 2X16 red/black LCD tests

Posted on Tuesday, January 17th, 2012 in testing by Ian

We got our hands on a few cheap 2×16 red/black LCDs of eBay for $5 a piece, these are the same LCDs from the unboxing video. In preparation to build the soldering iron driver, we tested them out with the Bus Pirate LCD adapter and the USB LCD Backpack. Initially we were worried that the red on black LCD would need a negative voltage supply, contrary to the advertisement, but it works great on a simple supply.

The USB LCD Backpack is available for $16.95 at Seeed Studio.

This entry was posted on Tuesday, January 17th, 2012 at 11:00 am and is filed under testing. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

5 Responses to “Cheap 2X16 red/black LCD tests”

  1. arhi says:

    These looks great. They use some back light to light trough that red chars or ?!

  2. arhi says:

    btw, where did you get these lcd’s? how much were they?

  3. Ian says:

    It is red LED backlight through red chars. It was around 5 bucks from seller egochina, they have a bunch but it looks like most color combos (and this one) are sold out. Here is an example (I hate ebay links because they die eventually):
    http://www.ebay.com/itm/Character-LCD-Module-Display-LCM-162-1602-HD44780-/190370286920?pt=LH_DefaultDomain_0&hash=item2c52f40d48

  4. arhi says:

    cool, thanks, very interesting.

  5. Perry Harrington says:

    My favorite way to generate a negative supply voltage is to steal the negative voltage off of a MAX233 or MAX232 chip. They can supply up to 10ma at -10v and up to 20ma. They are unregulated, so at higher current draws they put out a reduced voltage. This behavior is documented in the Maxim datasheet for the part.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • Derek: Is the Sunday one no longer a thing?
  • MG: Hi Ian, that's great news!!! I had a lot of misunderstandings with the factory that made me PCBs. I guess that despite keeping the "dirty"...
  • Doub: Just add sleeving and black variants of these 5557 and you'll take the enthusiast/gamer PC market by storm.
  • Jonathan Eisch: This is great! Coax with RF and lemo-00 connectors would make a huge difference to physicists everywhere. SHV (high voltage) is probably too much to...
  • James Fowkes: This is a brilliant service, I'm sure I'll be using it a lot. An option for spade/FASTON connectors would be amazing!