» Archive for the 'Gadgets' Category

Poynting Antennas and Wilson Antennas

Thursday, August 21st, 2008 by melissa

I’m posting this here mostly for my own future reference:

I’ve been using tri-band antennas from Wilson Antennas, but unfortunately they don’t actually work in the places where you need the antennas because, well they’re made for the US-based frequencies (e.g. 1900, rather than 1800)

Jeff Wishnie from Inveneo points out this antenna for boosting signal strength:

This high gain, wide band, directional antenna covers the GSM900 and GSM1800 / UMTS bands. The kit contains the antenna with 7 m cable and the Universal Cellphone Adapter packaged into a sturdy box with detail instructions on installation and use. This antenna covers the 900 and 1800 MHz band which is used in built up areas.

Features:

* Broadband
* Covers various international cellular bands.
* Robust and weatherproof.

This antenna can be bought with the applicable cables for the different cards. Versions are available for:

* Vodacom OPTION Card
* Vodacom NOVATEL Card
* Vodacom HUAWEI Card
* MTN Sierra Wireless Card
* MTN HUAWEI Card
* Cell C NOVATEL Card

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Preparing for Power Cuts

Thursday, August 21st, 2008 by melissa

I’m pretty gadget heavy on this trip. In terms of power stuff I have:

1 solar flexible-panel charger (retail $99-ish) for 4 AA batteries
2 solio solar chargers, for mobile phones and usb devices
(can be charged via solar or grid power. I only have one adapter
for grid power) (retail about $80 each)
1 inverter (retail about $40)
1 potenco pull cord charger for charging car batteries (on loan)

plus lots of portable cell phone chargers (that can double as flashlights, $25ish) using AA batteries, and a few $5 LED book lights with hard-to-replace batteries. I also have two sidewinders (retail $25) which are wind-up flashlights+cellphone chargers. They aren’t
particularly useful for charging cell phones, but they are better than nothing in a pinch.

the potenco pull cord charger is also a lot of work to charge a car battery - you wouldn’t want to use it unless you could hire some kids to pull at it on a regular basis for cheaper than you could pay for the equivalent work’s worth of fuel. It’s a great device tho, and
could easily be hooked up to a bike or a windmill (not too fast of a windmill tho). To charge a car battery, basically you bolt the charger to a wall, grab the two ends of a rope, and then you swing your arms like you are on a nordic track. Some lights come on and the
battery starts charging.

I haven’t tried it yet because I don’t have a car battery yet. :) I’ll try it next week when I go to Rubindi and I’m staying in the rural health clinic overnight. By some miracle I haven’t experienced a single power cut yet.

It’s also been raining, so the solio chargers and the AA batterycharger don’t seem to have charged fully yet, although maybe they would if I put them outside directly instead of just in my window..  I suspect the AA battery charger’s 4 hour claim for 2 batteries only works for the standard AA rechargeables and not my super-high capacity 2700 mAH batteries, because they only every charged up halfway.   In the end they really just work well as capacitors for grid power. =P

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Mobile Phone Microscope

Tuesday, May 27th, 2008 by melissa

So last year, our co-winners in the Bears Breaking Boundaries IT for Society contest was a group of students working on attachments for cell phone cameras that could be used for microscopy diagnosis of diseases like malaria. Since then both of our projects have been taken up by the Blum Center for Developing Economies, and the Telemicroscopy for Disease Diagnosis project has been written up in the news by a number of media organizations, including a recent issue of the Economist.

It’s part of an interesting new direction for technology research - instead of just building faster, more high-resolution (and more expensive) devices, people are working on ways to build low cost devices that are more robust, can be mass produced, and can provide good enough information for primary triage.

On another note, these devices (as the economist article posits) could be well deployed with a good mobile-phone-based data collection system - collecting not just text and numbers, but images as well.

As part of the evaluation for the Uganda OBA project, Ben Bellows and his collaborators at Makarere University are conducting a household survey in the coverage area of the project and in a similar control area. As part of this survey they have to also do sexually transmitted infection (STI) testing, trying to determine the actual prevalence of STIs and not just an estimate based on who comes in for diagnosis and treatment. Can you imagine how much easier and verifiable these surveys would be if 1) the data collection could be done electronically, and 2) digital media for the testing could be integrated into the data collection records? Not that all diagnoses could be done with cell-phone microscopy, and you still need careful sample and slide preparation. But it’s still something to think about…

AfriGadget

Monday, May 26th, 2008 by melissa

My friend Neema pointed out AfriGadget, a blog showcasing African ingenuity. The posts currently on the front page feature everything from biodiesel and renewable energy to simpsons toys to mobile phones made from recycled parts.

Epocrates for developing countries?

Tuesday, November 6th, 2007 by melissa

So I’m talking to my doctor about possible drug interactions between various prescriptions and he pulls out a… (drum roll) palm treo. Oh okay so that’s probably not a major revelation.. doctors love Palm devices and have loved them pretty much since 3COM started making them back in the 90s. (Can I say that yet? Back in the 90s?) And of course my immediate reaction is to ask him what software he uses, mentioning that I’m looking into what software might be useful for rural clinics in developing countries (e.g. Ghana and Uganda and D.R. Congo). He replied: you only need one! It’s called Epocrates.. like Hippocrates, but with an ‘e’! Clever, huh? (Okay I’m paraphrasing, but only a tiny tiny bit.) Then he proceeded to show me a drug database, a symptoms database, and a diagnosis database, all hyperlinked together.

Of course - before everyone goes off running to deliver this very fine product to the masses of doctors in developing countries, there are a couple of catches. The data is very much geared towards doctors in the US, which has a number of implications. 1) Only the drugs that are available in the US are listed, and then with the US names. So, for example, many of the newer malaria medications which haven’t been approved in the US (like Coartem) won’t be there. And other drugs like paracetamol (as it is known in the UK and former British colonies like Ghana and Uganda) will be listed as acetaminophen. 2) There’s a yearly recurring cost of $100. Of course, this might not be out of reach for these doctors, and certainly is about equivalent in price to the paper versions of these reference guides, and about 1000 times more portable.. 3) The pathology is different - a doctor in the US wouldn’t expect TB, where a doctor in Uganda or Ghana would know to look for TB symptoms.

I bring all this up because I spent part of this past summer in Uganda with the 2007 East Africa Blum Fellows visiting some of the Uganda Health Information Network (UHIN) deployment sites in Lyantonde and Rakai. What struck me most was not the specific programs offered by the project (digital submission of health outpatient statistics, and dissemination of malaria and pediatric health information), but rather how they appropriated the devices, installing and sharing their own applications, and using the Excel application to track inventory and patient logs. They just drink up this data, reading whatever they can get to learn more about how they can care for the wide variety of conditions they see every day. So.. in addition to whatever information management functions I can put into place, I hope I can also help put more information in the hands of the doctors and clinicians and nurses I’m working with.

There’s of course still a lot of other issues to deal with - everything from power for recharging to the cost of the devices themselves (~$70 for a Palm, and $300 for a Palm+Mobile Treo) to maintenance and sustainability. I still want to try putting this type of information in their hands, with all of the appropriate warnings, as well as more locally specific information, like local health bulletins or Hesperian’s translated Where There is No Doctor series. Let me know if you have any suggestions for mobile health applications!