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TinyLCD 35 from Tinylcd NeoSec

Update April 3, 2020

I reinstalled the TinyLCD screen on the latest Raspbian. And sofar it works well, fast screen updates, compared to the Kedei or Itead screens)
The mouse thingy was removed, did not like it so much. Touch screen is enough.

Here is what I did:

1. Fresh image Buster (full) to 16 GB SD card
2. Usual actions with raspi-config, boot to CLI, etc
3. Kill piwiz (sudo apt-get remove piwiz)
4. sudo nano /boot/config.txt
  add line dtoverlay=tinylcd35,touch,rotate=270,rtc-pcf
5. To display console text on TinyLCD35 screen
sudo nano /boot/cmdline.txt single line:
dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait fbcon=map:10
6. Select a smaller font for the console with: 'sudo dpkg-reconfigure console-setup'.
Select "UTF-8" encoding "Guess optimal character set",  "Terminus" font,  font size: "6x12" 
7. Reboot

X11 desktop

sudo nano /usr/share/X11/xorg.conf.d/99-fbturbo.conf

and enter: 

Section "Device"        
    Identifier "tinylcd35"   
    Driver "fbdev"  
    Option "fbdev" "/dev/fb1"  
EndSection  

9. startx will show desktop now. Touch works now corrrect for rotate 270 degrees.

Desktop X Windows, 
'sudo nano /etc/X11/xinit/xinitrc' 

and add the following line before ". /etc/X11/Xsession":

DISPLAY=:0 xinput --set-prop 'ADS7846 Touchscreen' 

10. Calibrate X (not working instructions yet for rotation, other than 270, see also the post on Adafruits PiTFT) 

sudo apt-get install xinput-calibrator

Optionally, check if you need to swap axes. if you need to swap just run:

xinit set-int-prop "ADS7846 Touchscreen" "Evdev Axes Swap" 8 1 or 'Evdev Axis Inversion' 1 0 ?

Run calibrator to get correct x,y positions.

xinput_calibrator --output-type auto

Name:   tinylcd35
Info:   3.5" Color TFT Display by www.tinylcd.com
        Options: Touch, RTC, keypad
Load:   dtoverlay=tinylcd35,=
Params: speed                   Display SPI bus speed

        rotate                  Display rotation {0,90,180,270}

        fps                     Delay between frame updates

        debug                   Debug output level {0-7}

        touch                   Enable touch panel

        touchgpio               Touch controller IRQ GPIO

        xohms                   Touchpanel: Resistance of X-plate in ohms

        rtc-pcf                 PCF8563 Real Time Clock

        rtc-ds                  DS1307 Real Time Clock

        keypad                  Enable keypad

        Examples:
            Display with touchpanel, PCF8563 RTC and keypad:
                dtoverlay=tinylcd35,touch,rtc-pcf,keypad
            Old touch display:
                dtoverlay=tinylcd35,touch,touchgpio=

Old text from 2015

I bought a tiny 3.5 ”  lcd touchscreen from NeoSec Solutions Pvt, Ltd, based in Mumbai, India. Not as a desktop replacement but for projects where a small touchscreen will be handy.
Not recommended. I learned there is a newer version with a working RTC, so this is now a not-supported old version.
No forum support, no information on IC’s used, limited documentation.
Just too high a price for this. Better look at an Adafruit solution in the same price range, but with excellent support and better community support also.
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Arduino 1.6.x for Raspberry PI Jessie

ArduinoAPP-01

Edit May 17 2016: Official support now: https://www.arduino.cc/en/Main/Software , still marked experimental

Edit march 22 2016: Have a look at https://github.com/arduino/Arduino/pull/4517 There is official support coming for ARM!

Old text follows, not uptodate:

This is a current build of the latest IDE for ARM, runs on RPi2 and RPi3 as reported, http://downloads.arduino.cc/javaide/pul … arm.tar.xz

I found a recipe to install Arduino IDE 1.6.0 on the Pi. Still not the latest, but much newer than 1.0.5 you get from the repositories. This is a fast process!

And on the Raspberry Pi forums a recipe for 1.6.5. Much slower to install, but it brings IDE 1.6.5 (which I need for the ATTiny85 and Micro pro!

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WLAN manually

How to setup a WLAN manually, if the desktop is not available (its a small widget on the left top otherwise)

Find out the available WLAN networks (there can be more WLAN adapters connected, wlan0 is the first)


sudo iwlist wlan0 scan

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Raspberry Pi Zero

A new Raspberry Pi, appeared end of November 2015. Called Zero, a break with the naming convention of A, B, A+, B+, Model 2 B. Reminds me a bit of the Arduino Zero 🙂

IMG_4624

The specifications are close to the A+ with the following changes:

  • (over)clocked at  1 GHz (called Turbo in raspi-config).
  • 512 MB instead of 256 MB
  • Micro USB connector instead of USB 2.0
  • Mini HDMI instead of HDMI
  • No Audio connector
  • Composite video available on solder pads
  • No CSI and DSI camera and display connectors
  • GPIO connector not soldered on

IMG_4629This makes the Zero the smallest and cheapest Raspberry Pi but also the less equipped. But is essence it is just a first generation Raspberry. The price is set at $5 officially.The Zero behaves (with the right cables) as all the other Rasperry Pi’s. The OS is the same, the latest is Jessie november 2015, and runs fine. The only visible Zero addition is a new overclock option in raspi-config, called Turbo (1000 MHz). I tried also an older but uptodate  Wheezy and that also runs fine.

I ordered two at the PiHut at launch day and was pleasantly surprised to get those, delivered very fast and at a price of £4. I also ordered the PiHut Zero Essential kit, which contains, in a nice can, micro to USB 2 adapter, a Mini HDMI to HDMI adapter and a large choice of GPIO connectors to be soldered in.

IMG_4631

What makes the Zero special for me is:

  1. Price. Even if the local dealers in Europe will charge at least 3x the $5 price by including two cables and VAT and profit, it still is a bargain.
  2. Size. This flat design makes it fit in even smaller designs.
  3. Freedom in GPIO connections. See below for some examples how this can be done, the PiHUT understands this very well by including choices in the Zero Essential kit.

IMG_4626 IMG_4627 IMG_4625

Micro connectors

As a Raspberry Pi user from the beginning, I have plenty of cable solutions in stock. You can see what I prefer here.  Now the Zero has a micro USB connector! Not a real problem since tablets, phones and even my latest notebook, the Asus T300-CHI, also only have these small connectors. Drawers full of micro cables and hubs therefore.  So here some preferred USB devices I use now with the Zero.

IMG_4635 IMG_4636 IMG_4634

Ebay: Micro USB 2.0 Host Male to USB Female OTG Adapter. Converts a USB 2.0 to a Micro USB by inserting this little thing.
IMG_4630
This USB hub combined with Ethernet adapter is also available with micro USB connector
IMG_4632
This low weight 3 port USB hub is seen here connected to a Zero with a Ethernet adapter, a WiFi adapter and a wireless Logitech keyboard/mouse adapter. The Mini HDMI conveter is coupled to a HDMI to DVI connector. The USB power has an on/off switch, highly recommended on the workbench.
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USBASP update firmware

I got a very cheap USBASP programmer for AVR from ebay. Long cable with 10 pin connectors and an adapter from 10 to 6 pin.
To be used for programming an Arduino where the bootloader is not wanted at startup or when it takes too much space in the RAM.

s-l1600 (1) s-l1600 (2)

You can program a skecth into an Arduino when the USBASP is connected with the Menu option Sketch: Upload Using Programmer. This also removes the bootloader, making space.

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ASCII ART by busyducks

ASCII ART, to copy into sketches or online.
ASCII ART by busyducks

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Revive a Freaduino MEGA 2650

IMG_4612The Freaduino MEGA 2650  looks a nice board at first view. It is advertised as Arduino MEGA 2650 compatible with many extras. Like a switch to run on 3.3V or 5V, which makes it easier to interface to 3.3V devices. And a more capable power circuit  when powered by a external powersupply: 800 mA 3.3V,5V 2A.

I have bought, a year ago, one of these boards: a 2012 version V1.4, date 22/10/2012. Looks well produced.

It has some deviations from the standard ATMEGA 2650 R3:

  1. The dimensions are not exactly identical to the Arduino MEGA2650, prototype boards do not fit. Pinout is identical though.
  2. It has a FTDI FT232L based serial interface instead of the ATmega16U2 IC.
  3. The FTDI FT232L on my board is a fake, so it becomes bricked when a current FTDI Windows driver detects this IC.

In 2014 I did not get it to work, due to the fake FT232L, and put it aside. But today I got it operational again! Alas still not operational on Windows, it works fine on a Linux system such as the Raspberry Pi.

Here are the steps!

 

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Arduino’s

All my standalone Arduino’s on one page. Also see the Raspberry Pi connected ‘Duino’s.
Each has been tested by compiling and uploading the standard Blink program or a variant.

Tested with the Arduino 1.6.5 on Windows 8.1 except the Freaduino tested on the Raspberry Pi!

Uno ATMEGA328 R2, R3

All are cheap but well made clones from China. All but one worked fine the first time. One, a Funduino, had a damaged bootloader, repaired with the excellent Bootloader program by Nick Gammon. And that Uno is fine now also! Read More

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Timelapse the commandline method

Simple but effective timelapse. Note that raspistill has many more interesting configuration parameters!

See https://www.raspberrypi.org/documentation/raspbian/applications/camera.md

Based upon notes by James Singleton.

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Raspberry Pi Camera Module

The Raspberry Camera Module is a giant success. Flexible, high quality, well supported. I have shown you already tow posts how I use those, RPi Cam Web Interface in Action and Timelapse, more to come!

Over the years I have bought several. All seem to be Revison 1.3, one is a clone.  Here some photo’s.

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