One solution might be to use this combination of charger and power booster.
https://www.adafruit.com/products/390
Solar Charger
https://www.adafruit.com/products/1903
Power booster
The charger will charger the battery via solar, usb, power adapter, etc. the power booster will take the load output and boost it to 5 v for the Omega.
Just seems like a simple, inexpensive solution... They also have the 6volt solar cells.
I see.... Use that instead of the return temp_c.?.?
Didn't think of that one. I'll give it a shot.
Thanks.
I have a python app to take the temperature reading from a DS18B20 sensor and display it on a 0.96" Oled display. My only problem is I can't for the life of me figure out how to write the code to convert the temp from C. to F. I have the formula, just don't know where to use it. I have tried a few things and they don't work.
I am including my code below. Thanks for any help...
[code]
#!/usr/bin/env python
import os
import glob
import time
from OmegaExpansion import oledExp
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'
def read_temp_raw():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines
def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string)/ 1000.0
return temp_c
status = oledExp.driverInit();
status = oledExp.setDisplayMode(0);
status = oledExp.scrollStop();
status = oledExp.write(time.strftime("%Y-%m-%d %X")+ " Temp:"+ str(read_temp())+" C");
[/code]
@Ian-Pun
That is a great example to work from. Thank you.
Only problem I have now is trying to convert the temp into F.
I have tried adding the calculations in everywhere I can think of and I just get errors.
Any help would be great. I am real new to python programing.
Thanks again.
Dan
@Ian-Pun Would you be interested in sharing your python code? I am just gettng started with python and have no clue where to start.
Thank you in advance.
Dan
@Boken-Lin,
I just password protected the AP, but to know how to turn it off would be good for future reference. Thanks.
Good Morning,
I had my Omega running yesterday and didn't have the AP secured. My iPad decided to connect to the open AP instead of my regular WiFi. I didn't even notice until I tried to print something and my iPad couldn't find my printer…. Weird….
I had full internet access through the Omega even though I never set up any kind of IP forwarding or anything.
Is the Omega supposed to act as a WiFi relay automatically or is this just a fluke?
I didn't expect this and have since set up a password on my Omega AP.
Thanks.
Good morning @Boken-Lin,
Thank you for your reply. That i helpful. My experience has mainly been with the Arduino platform and the PicAxe platform so all this python programing and stuff is fairly new to me… I'm learning though.
I can't wait for the Cloud thing to be available and see what kind of info and projects end up on there.
Any tips on learning python and stuff easier???
Thanks again.
@Sawyer-McBride,
I would be very interested in this. I have been working with the Raspberry Pi to create remote speakers for church, but this could make a cheaper solution if it works.
Thanks for your hard work.
@Boken-Lin I have looked at the page you have linked to, but it doesn't have what I was looking for. It basically tells you the basics of programming for the expansions. There are no usable examples for the servo dock.
The examples I wanted to use from the GitHub page actually have usable examples of positioning a servo. That's what I have been looking for. The other examples just tell how to set frequency, duty cycle, etc. I can do that from the app on the omega screen. That is only good for running an led or a motor or something.
I was looking for an example that actually showed me how to move a servo to a specific position or use a joystick to move the servo. The example on GitHub looks like it shows setting servo positions but it won't run…
Thanks in advance for any help.
Thank you @Lazar-Demin. I'll check it out.
This is where the Input idea comes from for the 3.3v line.
@Andrel Railean
The reason you get no detection when plugged into the 3.3v pin is because the 3.3v pin is an Input for power in. It is not an output. The only power outputs are the 2v and 2.5v pins.
Hope this helps.
Good evening.
I have downloaded a few of the python examples from the Onion GitHub page to try out. The first one I tried to use PWM.py just kicked out an error as follows:
root@Omega-172E:/Python-PWM/onion# python PWM.py
Traceback (most recent call last):
File "PWM.py", line 5, in <module>
from onion import I2C
ImportError: No module named onion
Am I missing something? Is there a module I have to download before using the examples?
Thanks in advance for any info.
This demonstration uses the ULN2003A, which is a cheaper version of the ULN2803, but is the same as far as electrical connections and such.
I wrote this in simple terms for clarity so anyone can understand it, hopefully.
In the Fritzing diagram below it shows the connections to the Onion Expansion and your external power source. This would be the same for whatever you are trying to power, wether it be an LED or a relay.
The ULN2003/ULN2803 sink the Ground to your part. So if you are trying to run LEDs or other directional power parts you have to have the Negative line(Cathode) of your part connected to the output of the chip and the positive leg of your part connected to the positive side of your power source.
When I hooked it up I just used the GPIO Tool in the Onion Console to turn on or off each color as I wanted. It worked flawlessly. My boy, only 4 years old, wanted to turn the colors on and off too.... lol
I hope this helps. Feel free to message me if you have any questions.
I ran your lines above and at the end I got these errors. I was just wondering if these two packages were installed or just Not installed because of one file error.
Collected errors:
That is very cool! I was just thinking about using these chips today. I will check out your files for sure....
I have been working with the Raspberry Pi on creating shairport speakers for our church. I was just wondering if there was any possibility of shairport being run on the omega? Here is a web page that has some details about shairport and installing it on the Raspberry Pi. I just don't know all the capabilities of the omega as yet.
http://drewlustro.com/hi-fi-audio-via-airplay-on-raspberry-pi/
Thanks for any help or ideas on other ways of doing this.
Dan
If you can get into it via usb cable, you can run "wifisetup" in the terminal to set the omega's setting to work on your router. Then you will have access to the GUI.
Hope this helps.