Re: [IAEP] [support-gang] Sensor Experts: I need help with my shopping list!
> > Hi Tony, > I was hoping someone would recognize one of the thermistors at the link I > sent with 4 possibilities. I am guessing that all the nominal resistances are quoted at 70F and that the 500K is 500K ohms. The only one that will work of the four then is 10K OHM NTC THERMISTOR. If you had more choice you would look for one at 5Kohms because the 10Kohms will only measure down to 12C > I guess I will also have to figure out which 680 ohm resistor to get out of > 19 available from the place in TX > http://www.alliedelec.com/search/searchresults.aspx?dsNav=Ntk:Primary%7c680+ohm+series+resistor%7c3%7c,Ny:False,Ro:0&dsDimensionSearch=D:680+ohm+series+resistor,Dxm:All,Dxp:3&SearchType=0&ps=60&fromsearch=true&term=680+ohm+series+resistor Buy cheap ones 1/4 watt or 1/8 watt Resistor; Carbon Film; Res 680 Ohms; Pwr-Rtg 0.25 W; Tol 5%; Axial Tony ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] [support-gang] Sensor Experts: I need help with my shopping list!
Hi Tony, I was hoping someone would recognize one of the thermistors at the link I sent with 4 possibilities. Unfortunately they don't have specs on them so I really can't tell which would work best... if at all. Maybe I should just go to "Plan B" and order LM35Ds from a supplier in TX and get the usb cables for power supply like the XO explosion kits have (like the one Mike Lee has). The cost would only be about $3.00 more. Any ideas from the rest of you??? I will get the light sensors for sure. I guess I will also have to figure out which 680 ohm resistor to get out of 19 available from the place in TX http://www.alliedelec.com/search/searchresults.aspx?dsNav=Ntk:Primary%7c680+ohm+series+resistor%7c3%7c,Ny:False,Ro:0&dsDimensionSearch=D:680+ohm+series+resistor,Dxm:All,Dxp:3&SearchType=0&ps=60&fromsearch=true&term=680+ohm+series+resistorThe store here is out of them. Anyone that can look at the links in the original email and this one and clue me in to what to get a bunch of us will be very grateful when we make and play with our sensors in SF! Thanks,Caryl > To: cbige...@hotmail.com > CC: support-g...@laptop.org; iaep@lists.sugarlabs.org; callaur...@gmail.com > From: fors...@ozonline.com.au > Date: Mon, 15 Oct 2012 14:51:29 +1100 > Subject: Re: [support-gang] Sensor Experts: I need help with my shopping list! > > Caryl > > > Temperature (thermister). Which of these will work best? > > www.allelectronics.com/make-a-store/category/770/Thermistors/1.html > > You want the resistance at 20C, 70F to be very roughly mid way (in terms of > voltage) in the measurement range of the XO. This gives the best range and > accuracy. > > http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Measuring_Temperature > > has a thermistor which is 5000 ohms at 20C which is somewhere near mid range > for an XO-1 (I dont remember exactly what mid range is but you can calculate > it looking at the source code, 10kohm sticks in my memory but...). The XO-1.5 > has a much better measurement range so choose on the basis of the XO-1 > > whether it is best to use positive or negative temperature coefficient, my > choice of NTC was pretty much random. It might have had a difference on how > simple the calibration function was but I didnt give this much thought > > > Light Will this one work? > > http://www.allelectronics.com/make-a-store/item/PRE-24/CdS-PHOTOCELL-PHOTORESISTOR/1.html > > Yes, looks OK, mid range light is within the XO's range > > > There isn't a lot of info about the ones for measuring soil moisture (but > > there is interest in this one), water salinity, and the lemon battery > > (looks like a fun one). They must all use the 3.5mm plug, right? Can one > > sensor be made to use for all of these or do they need different components > > in the circuit? If so, what different things are needed? Would we need to > > insert a resistor for XO-1s with the lemon battery? > > > > How about wire? Other than copper wire for the water salinity, what should > > I try to get for the rest? Gauge? Material, bare or covered? > > Whenever you are terminating the plug with bare wires you should include a > 680ohm series resistor to protect the XO-1 > http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Specifications > > When measuring moisture/salinity just experiment with 2 bits of copper wire > from your junkbox. The length of wire you use can be determined by trial and > error so they are mid measurement range. The measurements are uncalibrated, > what matters is the relative measurements. > > The lemon battery can use one of the copper wires above and any galvanised > nail > > > For the plugs, can we get cords with one plug at each end, split them and > > use for 2 sensors? Something like these? If we do that what other wire will > > I need to get? > > http://www.allelectronics.com/make-a-store/item/CB-389/12-CABLE-3.5-MM-STEREO-PLUGS-BOTH-ENDS/1.html > > Yes, its a 3.5mm stereo phono plug. I have used bare plugs and soldered my > leads. Some premade leads have a foil rather than a wire for ground that may > be difficult to connect to. Note the previous warning about the series > protection resistor for the XO-1. > > Tony ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
[IAEP] Entrega Hexoquinasa V0.6
*Proyecto **Piloto **Hexoquinasa* Hexoquinasa - Red Azúcar V0.6 - 14 de Octubre 2012 Licencia: GPLV3 Por: Aleksey Lim, Laura Victoria Vargas, Luis Sebastian Silva *Objetivo General* Activar y probar una red descentralizada de soporte e intercambio de recursos educativos libres con la intención de mejorar la experiencia de uso y apropiación de la tecnología SUGAR/AZUCAR entre los beneficiarios del programa Una Laptop Por Niño de Perú. *Resumen* Hexoquinasa es una imagen auto-actualizable de Sistema Operativo con entorno Sugar y acceso a la Red Azúcar. La Red Azúcar es una intervención tecnológica experimental cuyo objetivo es facilitar el intercambio entre usuarios y desarrolladoresy sus respectivas comunidades. Dadas las funcionalidades incorporadas a la fecha, los participantes de la Red están en capacidad de: - Acceder a la Red Azúcar desde el entorno de aprendizaje Sugar. - Crear y compartir recursos educativos libres (Proyectos y Artefactos). - Buscar y consultar recursos educativos libres (Actividades, Proyectos y Artefactos). - Formular y editar recursos de retroalimentación (Preguntas, Ideas, Problemas, Soluciones y Reseñas) relacionados con los recursos educativos consultados (Actividades y Proyectos). - Publicar soluciones a las preguntas, ideas y/o problemas formulados. - Hacer comentarios sobre los diferentes recursos de retroalimentación de la Red. - Consultar en línea de tiempo los recursos de retroalimentación ingresados a la Red. - Ejecutar Actividades de Sugar. - Instalar y desinstalar localmente Actividades de Sugar. - Introducir retroalimentación sobre la experiencia de uso de las Actividades de Sugar. - Favoritar / desfavoritar las Actividades de Sugar. - Realizar el reporte automático de fallas de las Actividades de Sugar. - Compartir estadísticas de uso. - Mantener actualizado el Software del Sistema Operativo. *Términos de Uso* 01 Para tener identidad en la Red Azúcar debes ser usuario de la plataforma de aprendizaje Sugar, en caso contrario desde Internet todos tienen acceso al usuario "Demo". 02 Mientras estés dentro del sistema, procura hacer el mejor uso de los recursos que tienes a tu disposición. 03 Considera que la Red Azúcar y sus componentes son *Bienes Comunes* osea nos pertenecen a todos. 04 Debes usar licencias libres sobre todo el contenido que publiques (de conformidad con la Política de Licencias de Sugar Labs). 05 Hay contenidos que NO están permitidos: Contenido Inapropiado (violento, sexual, subversivo, comercial, discriminatorio) Contenido con Licencias Inapropiadas El software contribuido debe contener las fuentes y las reglas para transformar las fuentes en binarios. 06 Al interactuar en la Red aportas a las estadísticas de uso, de acuerdo con la filosofía y práctica de los *Datos Abiertos*. 07 El incumplimiento de cualquiera de los términos de uso podrá significar la suspensión del acceso a la Red y/o la eliminación del contendio publicado. *Descarga e Instalación* Si tienes una XO1.5 sigue las instrucciones publicadas en nuestra wiki; http://pe.sugarlabs.org/go/Proyecto_Piloto_Hexoquinasa/Instalar *Más Información* Si te interesa leer mas sobre el proyecto "Upstream" consulta: http://wiki.sugarlabs.org/go/Platform_Team/Sugar_Network [en Inglés] Si te interesa leer mas sobre el proyecto "Downstream" consulta: http://pe.sugarlabs.org/go/Red_Az%C3%BAcar La seguimos! -- Laura V. I&D SomosAZUCAR.Org Skype/Facebook/Twitter acaire IRC kaametza ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] [support-gang] Sensor Experts: I need help with my shopping list!
Caryl > Temperature (thermister). Which of these will work best? > www.allelectronics.com/make-a-store/category/770/Thermistors/1.html You want the resistance at 20C, 70F to be very roughly mid way (in terms of voltage) in the measurement range of the XO. This gives the best range and accuracy. http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Measuring_Temperature has a thermistor which is 5000 ohms at 20C which is somewhere near mid range for an XO-1 (I dont remember exactly what mid range is but you can calculate it looking at the source code, 10kohm sticks in my memory but...). The XO-1.5 has a much better measurement range so choose on the basis of the XO-1 whether it is best to use positive or negative temperature coefficient, my choice of NTC was pretty much random. It might have had a difference on how simple the calibration function was but I didnt give this much thought > Light Will this one work? > http://www.allelectronics.com/make-a-store/item/PRE-24/CdS-PHOTOCELL-PHOTORESISTOR/1.html Yes, looks OK, mid range light is within the XO's range > There isn't a lot of info about the ones for measuring soil moisture (but > there is interest in this one), water salinity, and the lemon battery (looks > like a fun one). They must all use the 3.5mm plug, right? Can one sensor be > made to use for all of these or do they need different components in the > circuit? If so, what different things are needed? Would we need to insert a > resistor for XO-1s with the lemon battery? > > How about wire? Other than copper wire for the water salinity, what should I > try to get for the rest? Gauge? Material, bare or covered? Whenever you are terminating the plug with bare wires you should include a 680ohm series resistor to protect the XO-1 http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Specifications When measuring moisture/salinity just experiment with 2 bits of copper wire from your junkbox. The length of wire you use can be determined by trial and error so they are mid measurement range. The measurements are uncalibrated, what matters is the relative measurements. The lemon battery can use one of the copper wires above and any galvanised nail > For the plugs, can we get cords with one plug at each end, split them and use > for 2 sensors? Something like these? If we do that what other wire will I > need to get? > http://www.allelectronics.com/make-a-store/item/CB-389/12-CABLE-3.5-MM-STEREO-PLUGS-BOTH-ENDS/1.html Yes, its a 3.5mm stereo phono plug. I have used bare plugs and soldered my leads. Some premade leads have a foil rather than a wire for ground that may be difficult to connect to. Note the previous warning about the series protection resistor for the XO-1. Tony ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
[IAEP] Sensor Experts: I need help with my shopping list!
Hello folks, I need help with the sensor project. Unlike a cookbook or sewing pattern, the instructions for sensors on our wikis don't include a list of ingredients or needed tools and supplies. Wouldn't it be fun to create an "XO Cookbook?" It could include simple "recipes" for making peripherals and maybe other things as well. Anyway, I have been trying to make a shopping list for parts for the sensors we can build at the Summit. The temperature and light sensors are fairly straightforward and I have found sources for components I think will work. I just need to know which ones will work best with the XOs Temperature (thermister). Which of these will work best? www.allelectronics.com/make-a-store/category/770/Thermistors/1.html Light Will this one work? http://www.allelectronics.com/make-a-store/item/PRE-24/CdS-PHOTOCELL-PHOTORESISTOR/1.html There is a lot of interest in Humidity sensors. These are a bit harder to find. I don't know exactly what to search for. Does anyone know what make/model the one shown on the wiki is? http://wiki.laptop.org/go/Making_XO_sensors/Making_a_Humidity_Sensor There isn't a lot of info about the ones for measuring soil moisture (but there is interest in this one), water salinity, and the lemon battery (looks like a fun one). They must all use the 3.5mm plug, right? Can one sensor be made to use for all of these or do they need different components in the circuit? If so, what different things are needed? Would we need to insert a resistor for XO-1s with the lemon battery? How about wire? Other than copper wire for the water salinity, what should I try to get for the rest? Gauge? Material, bare or covered? For the plugs, can we get cords with one plug at each end, split them and use for 2 sensors? Something like these? If we do that what other wire will I need to get? http://www.allelectronics.com/make-a-store/item/CB-389/12-CABLE-3.5-MM-STEREO-PLUGS-BOTH-ENDS/1.html The store I looked these up at is located in the nearby San Fernando Valley where I will be going anyway on Thursday. So, I can pick them up then (at $4.50+/gal I have to consider combining trips). There may be another store closer to my home as well. For some things this store doesn't carry, I may have to order out of state with fast delivery. I need this info really before tomorrow am (say 9 am PDT) as I will need to order then for anything that has to be shipped. Thanks, Caryl P.S. Claudia, Yama said you have done a lot of things with sensors. Do you have any input on these? Any others we may have overlooked? I like Trinidad Guzman's use of a potentiometer to track a pendulum, but no one else has mentioned an interest in that one. ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] [support-gang] Reminder Plus... 2 Interesting MOOC Classes Start Tomorrow... Sign Up? Groups?
oh, this seems to be just on par with my Python experience in general, maybe the nature of the beast. Many different paths possible, documentation sort of random. Confusing! The good of it is that it indeed seems to be an environment where anything is possible. As to bugginess, I do not think it is inherent to Python, likely just an effect of a lot being tried all over the place, though it makes the atmosphere somewhat less welcoming - I gave up very quickly, found Assembler still easier :-) Getting started in Python seems a very steep step, and that probably explains to some extent why so very, very few developers are yet coming from the XO users world. Hopefully, by learning it, people like Caryl, so good at "translating English to English" will be able to make a difference there also. On 10/14/2012 01:06 PM, Caryl Bigenho wrote: I have been working through some of the sections on the Code Academy lessons (one of the many resources they have) and have found it a bit buggy. Actually, I find the huge number of resources a bit overwhelming! It is hard to figure out exactly what to do first. I am hoping that will change tomorrow and that The Machine will be more specific about where to start. ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
[IAEP] Reminder Plus... 2 Interesting MOOC Classes Start Tomorrow... Sign Up? Groups?
Hi MOOC-ers! Tomorrow is the official start date for both The Machine MOOC for Python and the Stanford Venture Lab course on Educational Environments. Not much from Stanford yet, but the Machine has been busy sending all sorts of messages, including one yesterday with links to where the course can be accessed in Chinese! One thing the machine has done is assign us to random study groups for the Python course. There is a way to change groups. Would any of you who are signed up for the Python course like to try to make our own group? It might be a little bit more fun than a lot of strangers who just happen to be in the same time zone. Send me an email if you want to try to get into the same group and I'll try to figure out how to make it happen. I have been working through some of the sections on the Code Academy lessons (one of the many resources they have) and have found it a bit buggy. Actually, I find the huge number of resources a bit overwhelming! It is hard to figure out exactly what to do first. I am hoping that will change tomorrow and that The Machine will be more specific about where to start. I am still waiting for word from the Stanford Venture Lab course which is also supposed to start tomorrow. I guess they are sometimes slow in starting. You can probably still sign up for either one or both of the courses. I'll put the links below again. Caryl Python Course: http://mechanicalmooc.org Stanford Venture Lab course on Educational Environments: http://venture-lab.org/education ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] [support-gang] It's Time to Sign Up For Sensors!
Thanks Mile, Nick, and Janissa! All great ideas. I especially like the T-shirt one. I have a cool black one I got at the Summit in Uruguay... that should do nicely! I too get the thorough "suspected terrorist" treatment whenever I fly... 2 metal knees, no see-through scanners, lots of computers and their chargers and stuff, and all of my diabetes meds. Travel by air is really not fun any more. Caryl From: jani...@silverstar.com To: support-g...@lists.laptop.org Date: Sun, 14 Oct 2012 09:52:18 -0600 Subject: Re: [support-gang] [IAEP] It's Time to Sign Up For Sensors! I’ve also found that carrying information about my project is very helpful. When I fly, I usually wear a shirt with our logo and name on it, and inspectors often lighten up when they see it, often commenting on it and asking questions about the XOs instead of searching my bag. I think putting information in your checked bags is also helpful if you’re carrying any kind of electronics. I have food allergies, so I always have a box of food bars in amongst the wires and laptops in my checked bag. I’m sure it must look like a bomb on the screening equipment because my bags have never not been searched. I put our organization’s brochure front and center so it’s the first thing inspectors see when they open my luggage. I’ve watched them open my bag, take one look at that brochure and relax, then make a short search. That might not bode well for safety, but it keeps my carefully cushioned electronics packing intact. Janissa From: Nicholas Doiron Sent: Sunday, October 14, 2012 8:33 AM To: Community Support Volunteers -- who help respond to help AT laptop.org Cc: IAEP SugarLabs ; support-g...@laptop.org Subject: Re: [support-gang] [IAEP] It's Time to Sign Up For Sensors! I've been taking sensors in a ziploc bag in my carry-on, with some OLPC info or cards to show if I'm asked about it. I figure it would be easier to handle a question in person than have someone looking at my checked luggage. I just flew from Oakland to Portland with an XO and several electronics, and they were more concerned about bottled water. Nick Doiron On Oct 14, 2012 12:35 AM, "Kevin Mark" wrote: I take a significant amount of cords and electronic doodads through TSA regularly. I find that you'll only be hassled if the wires are parts are all mixed together making it hard to tell what's there in X-ray. I just keep a ball of rubber bands around and neatly coil and band each cable, and put small parts in clear zip lock bags. And you can store it in checked baggage if you're doing that. Mike Have a bill of sale might be good to show? ___ support-gang mailing list support-g...@lists.laptop.org http://lists.laptop.org/listinfo/support-gang ___ support-gang mailing list support-g...@lists.laptop.org http://lists.laptop.org/listinfo/support-gang ___ support-gang mailing list support-g...@lists.laptop.org http://lists.laptop.org/listinfo/support-gang ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
Re: [IAEP] [support-gang] It's Time to Sign Up For Sensors!
I take a significant amount of cords and electronic doodads through TSA regularly. I find that you'll only be hassled if the wires are parts are all mixed together making it hard to tell what's there in X-ray. I just keep a ball of rubber bands around and neatly coil and band each cable, and put small parts in clear zip lock bags. And you can store it in checked baggage if you're doing that. Mike Have a bill of sale might be good to show? ___ IAEP -- It's An Education Project (not a laptop project!) IAEP@lists.sugarlabs.org http://lists.sugarlabs.org/listinfo/iaep
