Display tweets on a character LCD

RE: Display tweets on a character LCD

e14 Contributor — Tue, 17 Sep 2013 19:50:16 GMT

I'm interested in building this project. Does the display-hashtag command support multiple hashtags or can you only follow one at a time? Thanks.

RE: Display tweets on a character LCD

e14 Contributor — Sat, 20 Jul 2013 03:18:17 GMT

I can confirm that the library you are using does not utilize bidirectional communication. It only requires the enable, register select, and 4 data lines to be connected to the Pi's GPIO so you are completely safe as long as LCD pin 5 is held low and not left floating. One would just need to be very careful here when building this circuit It is somewhat hard to tell but it does appear that LCD pin 5 is indeed connected to ground in your picture.

RE: Display tweets on a character LCD

e14 Contributor — Fri, 19 Jul 2013 20:16:09 GMT

I have not looked at your code in detail, is there ever an instance where pin 5 on the LCD could be pulled high? This is where I would be concerned. I agree that you would be 100% safe as long as LCD pin 5 was never pulled high (this changes the data direction).

RE: Display tweets on a character LCD

e14 Contributor — Wed, 17 Jul 2013 22:05:50 GMT

I have noticed that you have specified a 1k potentiometer in your parts list. However, upon reading the datasheet for the LCD, a 10k to 20k pot is recommended. Just thought I would make you aware of this. Also, have you ever had any issues when reading from the LCD since the LCD you have specified uses 5V logic levels and the GPIO pins on the Pi are not 5v tolerant?

Nash Kaminski

RE: Display tweets on a character LCD

e14 Contributor — Tue, 22 Jan 2013 23:31:34 GMT

Hi Drew,

It's asking me for a user/password when I :

git clone https://github.com/pdp7/tweetypi.git

What am I doing wrong or ??

Ta Neil