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--- raspberrypi:start [2018/02/14 02:42]
dwheele [Changing Approach 1/4/2018]
+++ raspberrypi:start [2020/06/25 16:27] (current)
dwheele [7-Inch 1024x600 Touch Screen]
@@ Line 90: / Line 90: @@
 https://openweathermap.org/forecast5
+===== Weather Underground =====
+Switching to Weather Underground because they allow more frequent hits.
+List of possible conditions:
+https://www.wunderground.com/weather/api/d/docs?d=resources/phrase-glossary
 ===== Install PIP (Package Installer for Python =====
@@ Line 193: / Line 201: @@
 [[.gitinfo|Git Info]]
+===== Installing other packages ======
+For interpolation:
+sudo apt-get install python-numpy python-scipy python-matplotlib python-pandas python-sympy python-nose
+(There were others like "ipython" but they failed, so I removed them, and it worked anyway.)
+===== PCA9685 Servo Card =====
+Purchased another Raspberry Pi ("Conner") received 1/22/2019. Purchased another MicroSD, installed Raspian on it.
+  * {{:raspberrypi:adafruit-16-channel-servo-driver-with-raspberry-pi.pdf|Instructions to use PCA9685 with Raspberry Pi}}
+After doing the installation, this successfully moved the servo:
+<code python>
+import time
+from adafruit_servokit import ServoKit
+kit = ServoKit(channels=16)
+kit.servo[0].angle = 135
+time.sleep(1)
+kit.servo[0].angle = 0
+time.sleep(1)
+kit.servo[0].angle = 45
+</code>
+''python3 test2.py''
+===== 7-Inch 1024x600 Touch Screen =====
+^Resolution|1024x600 (aspect ratio ~1.71 (128/75))|
+^Amazon|[[https://www.amazon.com/gp/product/B075QCXLPF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1|Detail web page|
+^Version|v2.04|
+^Manufactuer|GeeekPi|
+^Size|SVGA Wide|
+^Purchased|1/14/2019|
+Purchased a 7-Inch 1024x600 Capacitive Touch Screen, which serves as a small HDMI monitor. Had to use regular monitor temporarily to set up configuration at ''/boot/config.txt''. Added these entries to support 1024x600:
+<code text>
+hdmi_group=2
+hdmi_mode=87
+hdmi_cvt 1024 600 60 3 0 0 0
+hdmi_force_hotplug=1
+</code>
+Later followed this:
+<code bash>
+git clone https://github.com/yoyojacky/52Pi.git
+cd ~/52Pi
+chmod +x restool.sh
+./restool.sh
+</code>
+Which further manipulated ''/boot/config.txt''
+===== MCP4725 DAC =====
+This is I2S compatible. Worked well the first time. The problem is that I need a lot of these, and normally you can only have two, selectible with an A0 address line.
+It is rated at 25 ma of output. Connected to aviation simulator instrument, it only consumed about 0.5 ma, so connected directly to it.
+https://www.adafruit.com/product/935
+This could be multiplexed.
+It can also be connected to an external op amp, e.g., LM358
+This shows simple comparator, and simple gain amp: https://www.youtube.com/watch?v=g3TybiZHQ-A
+==== Problem to use more than two ====
+To get more than two, get a TCA9548a multiplexer. This allows 8 devices to connect, you hit the multiplexer with the number of the device to hit. Perhaps this means that I can have 16 DACs per Raspberry Pi. You can also have multiple multiplexers, each can respond on a different address themselves. It is also possible to get Raspberry Pi zeros for about $5
+https://learn.adafruit.com/adafruit-tca9548a-1-to-8-i2c-multiplexer-breakout
+===== To Code With C =====
+Using "Geany" - an IDE which is installed and comes with Raspberry Pi. It is a GUI app, but can run it remotely from Windows via vnc server.
+**On Raspberry Pi**
+  * Run ''vncserver''
+  * ''vncserver :1 -geometry 1920x1080''  to set up a larger window.
+**On Windows**
+  * Run VNC Client. Connect to pi 192.168.0.8. Login with "pi" credentials (regular ssh login).
+  * You can see the GUI. Launch Geany
+===== Trying VisualGDB =====
+[9/21/2019] Because I'm doing more programming for the Raspberry Pi, decided to try VisualGDB. This is a go-between which lets you develop in Visual Studio C++, and then build/run on Raspberry Pi.
+  * https://visualgdb.com/download/
+After reviewing some of this, it is very complicated. Trying to use Geany instead on the Raspberry Pi. The code for this is not that involved.

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