Topics tagged with lcd

Someone has worked with LCD 4x20 I2C Model 2004A ?

Daniele Scasciafratte — Mon, 27 May 2019 17:17:13 GMT

With raspberry pi1 (the 2011 model) the screen are working but not with omega that not recognize them. I will probably resell my omega and various accessories because the assistance is not very helpful

Google Calendar and something more than a connected buzzer...

Fabian Nydegger 0 — Tue, 13 Mar 2018 15:32:19 GMT

Hi Andrea Take a look at: https://developers.google.com/calendar/overview Personally i prefer python or php. You can use crontabs to trigger the 30min event. https://docs.onion.io/omega2-docs/running-a-command-on-a-schedule.html I don't really have any expirence with the calendar api, so I can't give you an example. But I hope this may give u an idea on how to start.

Bitcoin Clock

Csaba Csanaki — Wed, 20 Dec 2017 10:39:19 GMT

I get a following error: Traceback (most recent call last): File "bitcoin.py", line 27, in a=json.loads(jsfile) File "/usr/lib/python2.7/json/init.py", line 339, in loads return _default_decoder.decode(s) File "/usr/lib/python2.7/json/decoder.py", line 364, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode raise ValueError("No JSON object could be decoded") ValueError: No JSON object could be decoded I modify the line27 - but the error is same: Traceback (most recent call last): File "bitcoin.py", line 27, in a=json.loads(jsfile)[0] Can you help for me, how could I fix it? Thanks a lot!

Temperature reader with Omega2+

Gabriel Ongpauco — Tue, 04 Apr 2017 21:49:10 GMT

@Zachary-Haslam We have a guide to this setup in our Starter Kit experiments. Check out https://docs.onion.io/omega2-starter-kit/starter-kit-controlling-an-lcd-screen.html to learn how to read a 1-Wire temperature sensor and display it on a 16x2 LCD screen! Gabe

Problems with a TFT display module LCD

Chris Stratton — Tue, 14 Mar 2017 17:43:37 GMT

It is probably possible, but SPI on the MT7688 has enough quirks, along with the current state of the software stack, that it may be quite a challenge to tackle this in a pioneering way, unless someone has already gotten your display or a conceptually simpler one working. An idea you could consider would be using an Arduino (or bare ATmega or some even cheaper MCU) to act as a serial-to-SPI bridge, such that you could just write data out the serial port and the Arduino would turn that into commands for the display. Wasteful of hardware perhaps, but if it transforms the project into a more familiar one it could be beneficial. Note that in doing it that way you also abstract out the Omega entirely - you can probably run your program on your development machine itself displaying through the Arduino while you work out the details, and only bother with cross compiling and installing it on the Omega module occasionally as a check. You also end up able to replace the Omega module with whatever platform seems interesting next year.

Dual LCD displays

David Wickenden — Wed, 18 Jan 2017 14:14:55 GMT

Python I2C LCD 16x2 library

David Stein — Mon, 14 Mar 2016 14:02:24 GMT

Thanks. Pull request created.

oled-exp draw image format?

Malcolm White — Mon, 15 Feb 2016 04:06:58 GMT

If you take a look at the github source of the i2c-exp-driver, there is a subdirectory called bmp2lcd. In there is the javascript on how to create the image (looks like a simple packed binary stream).

What TFT LCD are compatible?

Alexander Soto — Sat, 16 Jan 2016 02:38:39 GMT

@Kit-Bishop Sounds great! I'm still debating between the size / resolution. Ideally, the screen and the cube itself should be created for someone who is from 13 to 18+ years old and held by their hands a la Rubix Cube. This should be a fun project! I'll keep you posted!

I'm trying that ...

Gwena56 — Tue, 22 Dec 2015 07:01:12 GMT

Hello With i2cset it replies incorrect mode i can use mode b or w ... But i think it's normal ... i've seen this option several times but not very often . i'm using this process to initialize LCD crystal 2x16 using a pcf8594 I2C 8bit expander port : Tech Docs So i've tried orther method using python without smbus import... Peripheri.i2c do that. I can only turn on/off backlight ... Thanks for helping .... Oméga it's cool !!¡ a bit of incomplete code ... #!/usr/bin/python import i2c import pyOmega pyOmega.mSec(100) #Open i2c-0 controller chip = i2c.I2C("/dev/i2c-0") ##LCD PROC def lcd_reset(): chip.transfer(0x27, [i2c.I2C.Message([0xFF])]) pyOmega.mSec(20) chip.transfer(0x27, [i2c.I2C.Message([0x83])]) chip.transfer(0x27, [i2c.I2C.Message([0x03])]) pyOmega.mSec(15) chip.transfer(0x27, [i2c.I2C.Message([0x83])]) chip.transfer(0x27, [i2c.I2C.Message([0x03])]) pyOmega.mSec(5) chip.transfer(0x27, [i2c.I2C.Message([0x83])]) chip.transfer(0x27, [i2c.I2C.Message([0x03])]) pyOmega.mSec(5) chip.transfer(0x27, [i2c.I2C.Message([0x82])]) chip.transfer(0x27, [i2c.I2C.Message([0x02])]) pyOmega.mSec(5) def lcd_init(): lcd_reset() lcd_cmd(0x28) lcd_cmd(0x0C) lcd_cmd(0x06) lcd_cmd(0x80) lcd_cmd(0x80) def lcd_cmd(xcmd): print xcmd lcd_cmd(0x28)