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by Sarge
Thu Oct 15, 2015 7:39 pm
Forum: HATs and other add-ons
Topic: [Sleepy Pi] Need help waking and sleeping on a schedule
Replies: 6
Views: 3393

Re: [Sleepy Pi] Need help waking and sleeping on a schedule

you've got it right. the Sleepy Pi is controlling the running state (ON/OFF) of the Rasberry Pi via an independent power controller in the form of an ATMega328 chip. it isn't particularly useful for ON/OFF cycles that are spaced closer together than a few minutes. but it is useful for battery conser...
by Sarge
Mon Mar 09, 2015 12:42 pm
Forum: HATs and other add-ons
Topic: [Sleepy Pi] Need help waking and sleeping on a schedule
Replies: 6
Views: 3393

Re: [Sleepy Pi] Need help waking and sleeping on a schedule

Hi, I looked at the TimeAlarms library and I don't think you'll be able to use that for your application. That requires the ATMega chip to be running. You aren't planning on letting the ATMega run at full power, are you? This would take ~50mA of current and is unnecessary. It is better than letting ...
by Sarge
Sat Mar 07, 2015 10:25 pm
Forum: HATs and other add-ons
Topic: [Sleepy Pi] Need help waking and sleeping on a schedule
Replies: 6
Views: 3393

Re: [Sleepy Pi] Need help waking and sleeping on a schedule

Hi Goyney, I might be able to help. I have a Sleepy Pi as well and am about to use it in a project that wakes up and adjusts the position of a solar panel at set intervals. I'm not familiar with the Timealarms library you are using in your program so I can't help there, but I have the following code...
by Sarge
Sat Nov 08, 2014 3:04 pm
Forum: Automation, sensing and robotics
Topic: MQ-7 Carbon Monoxide Sensor
Replies: 4
Views: 11860

Re: MQ-7 Carbon Monoxide Sensor

Hi, I've got this sensor as well and I'm trying to figure out how to get usable readings. This isn't going to be the only CO sensor in our house; just something that I can move around the house (like into the furnace room) to find out the differences in air. I do have some comments about doing this ...
by Sarge
Tue Jun 17, 2014 1:19 am
Forum: Camera board
Topic: Options for Fast Booting A Fast Boot to Camera Running
Replies: 5
Views: 1508

Options for Fast Booting A Fast Boot to Camera Running

Hi, I'm trying to get a functioning trailcamera into the field, using a Pi, PiNoir camera, and SleepyPi for battery management. I have a bit of an issue in that from the time the camera is triggered until it has booted up and is running video is approximately 12 - 15 seconds. I'm running Arch Linux ...
by Sarge
Tue Jun 17, 2014 1:10 am
Forum: Camera board
Topic: I'm sorry to bother you big coders...I'm completely lost.
Replies: 7
Views: 1955

Re: I'm sorry to bother you big coders...I'm completely lost

Scott, are you working in Windows as well or only on the RasPi? I'm finding it much easier to take pictures and video on the Pi and then download it to my Windows laptop for viewing. The open source video player I'm using is VLC media player, available at this URL http://www.videolan.org/vlc/index.h...
by Sarge
Sun Jan 05, 2014 3:28 am
Forum: Arch
Topic: Fast boot Arch configuration?
Replies: 0
Views: 2680

Fast boot Arch configuration?

Hello, I'm building a motion-activated trail camera, using the Raspberry Pi's Pi Noir camera, an IR LED array and an ATMega328P-PU chip (Arduino) to control the whole set-up. I'm doing this because trail cameras have to operate in the wild, off of batteries, so power management is very important. On...
by Sarge
Mon Dec 09, 2013 2:05 am
Forum: Automation, sensing and robotics
Topic: DHT22 humidity sensor stops working
Replies: 11
Views: 9024

Re: DHT22 humidity sensor stops working

I've got this Adafruit DHT22 sensor. It has been working indoors without a problem since May. The key for me was this person's code: https://github.com/technion/lol_dht22 . Of course, it gets rejects but continues polling until it gets a response. I've been running another DHT22 in a tougher situati...
by Sarge
Mon Dec 09, 2013 1:12 am
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

Yes, a sealed lead acid battery seems to be the way to go. It does raise a problem with the voltage regulation however. I have the set-up discussed above working with two NPN - PMOSFET switches controlled by the same ATMega328 pin. The IR LED array is directly off the 12V supply. The Arduino/Pi are ...
by Sarge
Fri Dec 06, 2013 8:32 pm
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

I will have access to a higher voltage supply. I'm not sure how many volts but I'll need to power IR illumination since this is a night photography application. 12 volts should probably do it. Maybe the combination of 5 volts supply for the Pi/Arduino combination and 12 volts for the IR illumination...
by Sarge
Fri Dec 06, 2013 1:56 pm
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

Hi Tage/Bob, Thanks for the input. I was able to cobble the circuit together last night using IRF9521 as the P MOSFET and PN2222 as the NPN transistor. The only counter-intuitive aspect, and something that caused me to scratch my head for an hour or so, was that I had to connect the 5V+ of the Pi to...
by Sarge
Thu Dec 05, 2013 6:37 pm
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

Thanks for the info . . .

It looks like I'll need to procure a P MOSFET and give the suggested lay-out a go . . .

Sarge
by Sarge
Thu Dec 05, 2013 4:50 pm
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

Hi, It is controlling the ground. The Pi is connected to the Vcc+ (5V) rail. Its ground is connected to the MOSFET drain. My Pi is the load in the N MOSFET graphic on this webpage. http://reibot.org/2011/09/06/a-beginners-guide-to-the-mosfet/ The Arduino microcontroller pin drives the gate. The sour...
by Sarge
Thu Dec 05, 2013 4:15 pm
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Re: Low power MOSFET to Launch the Pi

Thanks Tage. This is very helpful. I will look into it. In my current situation, what is happening? Why am I still getting these two volts, 70 mA when the gate voltage is 0? Is this Drain - Source forward voltage and current that are present even with the gate voltage is 0? I'm trying to figure out ...
by Sarge
Thu Dec 05, 2013 3:07 am
Forum: Automation, sensing and robotics
Topic: Low power MOSFET to Launch the Pi
Replies: 13
Views: 3908

Low power MOSFET to Launch the Pi

Hi all, I've been working on a project that involves launching the Pi, when triggered, but otherwise keeps the Pi and the rest of the hardware in low power consumption mode. Using the tools, so far, that means in the 700 - 900 uA range so that this application can be run on battery power for weeks o...
by Sarge
Mon Aug 19, 2013 12:15 am
Forum: Networking and servers
Topic: Installing LAMP server, problems with MySql
Replies: 26
Views: 8725

Re: Installing LAMP server, problems with MySql

Hi, I came back to these discussions multiple times over the past couple days. I was running into the same problem on the RPi: once I got the http://localhost/wordpress installation page, I was getting an "unable to connect to database message". I worked it over a number of times, mainly using the a...
by Sarge
Wed Aug 07, 2013 2:50 am
Forum: Automation, sensing and robotics
Topic: How much abuse?
Replies: 3
Views: 851

How much abuse?

I may have pushed it too far. :lol: After having a pi outside, inside a weather-proof box, taking timelapse photopgraphy of the sunsets for a month or so, I decided to put one under my furnace blower vent (also outside) to capture all the on-time of my furnace. (Even in the summertime . . . how anno...
by Sarge
Fri Jun 14, 2013 2:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Cheapest, lowest power solution
Replies: 2
Views: 867

Re: Cheapest, lowest power solution

Thanks, Jon.

This is just the type of guidance with references I was looking for.

cheers,
Sargent :D
by Sarge
Fri Jun 14, 2013 2:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Cheapest, lowest power solution
Replies: 2
Views: 867

Cheapest, lowest power solution

Hi, I've gone through several iterations of controlling a light with the pi and PIR sensor. Originally started along the lines of this tutorial: http://learn.adafruit.com/adafruits-raspberry-pi-lesson-12-sensing-movement I've come to the solution below, using a FSR, because it seems to work better f...
by Sarge
Wed Jun 05, 2013 1:41 am
Forum: Automation, sensing and robotics
Topic: PI to control AC Window Unit
Replies: 5
Views: 3732

Re: PI to control AC Window Unit

If your window AC unit has a cord, it should work . . . 1. Power the AC "ON" 2. Unplug from the wall 3. Plug into the Powerswitch 4. Plug Powerswitch into an electrical receptable. 5. Hook up the Pi to Trip the Powerswitch according to the conditions of your choosing (i.e., write a python program). ...
by Sarge
Tue Jun 04, 2013 2:20 am
Forum: Automation, sensing and robotics
Topic: PI to control AC Window Unit
Replies: 5
Views: 3732

Re: PI to control AC Window Unit

Hi there, One of these would work nicely. http://www.powerswitchtail.com/Pages/default.aspx :) Adafruit has a tutorial for using a device like this to activate the power. Their tutorial uses a PIR sensor. In your case, maybe a temperature/humidity sensor would be more appropriate. I'm not sure about...
by Sarge
Tue May 21, 2013 5:33 pm
Forum: Camera board
Topic: Motion - Ip Camera Possible
Replies: 35
Views: 41826

Re: Motion - Ip Camera Possible

@decrot, yep, I was thinking along those lines as well but was steered to the motion solution by others on the forum. my guess is the camera is going to have a larger field of view and certainly a greater range. the typical PIR sensor has a maximum sensing range of 5 - 7m, the long range version Pan...
by Sarge
Tue May 21, 2013 1:36 am
Forum: Camera board
Topic: Motion - Ip Camera Possible
Replies: 35
Views: 41826

Re: Motion - Ip Camera Possible

this was/is a good thread . it got me going on the road to using motion with my raspicamera. :? there were some dots for me to connect however, from the discussion above, since I'd never done webservers and thought that "cgi" had something to do with computer graphics. there is good article on setti...
by Sarge
Wed May 15, 2013 12:25 pm
Forum: Automation, sensing and robotics
Topic: Hardware Advice Requested
Replies: 8
Views: 1518

Re: Hardware Advice Requested

techpaul, thanks for that reference to the Panasonic sensors. I had seen them but steered clear until this moment because I'm not aware of any interfaces written for the pi. Are you aware of libraries that have already been written for these Panasonic sensors? That leads me to another question which...
by Sarge
Tue May 14, 2013 5:10 pm
Forum: Automation, sensing and robotics
Topic: Rpi and relay to switch on/off lights
Replies: 27
Views: 80952

Re: Rpi and relay to switch on/off lights

You could use a Power Tail Switch.

http://www.powerswitchtail.com/Pages/default.aspx

Maybe pricier than the relays but works fine with the Pi's GPIO.

Sarge

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