Category: Gadgets

Charging mobile phones with bikes and scrap

Just last week two African inventors won recognition for inventions that involved scrap, bicycles and mobile phones.

William Kamkwamba grew up as a farmer in Malawi, at the age of just 14, he had built his own wind generator.

During a drought his families fortunes collapsed and he spent his time in libraries reading and discovering about wind energy. He found components for his invention in a scrap  yard; a tractor fan, shock absorber, PVC pipes and a bicycle frame.

When his prototype was able to run four bulbs people arrived to charge their mobile phone. William has just appeared on TED  Global conference in Oxford this week to the conference to tell the audience how he did this.

Another inventor has already appeared on Afrigadjet and has just been discovered by the BBC. Pascal Katana, 22 who with Jeremiah Murimi, 24, has gone beyond fish and has invented a dynamo-powered “smart charger” to help people without electricity in rural areas to charge their cell phones. The system costs $4.50 and it takes an hour to fully charge a cell phone.

These two young men developed the idea during summer break. Wish I had so much energy in my holiday.  These guys should be at Maker Faire in Ghana this August.

Fish ‘call’ the Fisherman

pascal
Pascal Katana, a Fourth Year student at the Department of Electrical and Information Engineering at the University of Nairobi, Kenya, developed an electronic device that ‘automates’ fishing. The trap employs amplification of the sound made by fish while feeding. The acoustic signals are radiated and attract other fish who head toward the direction of the source thinking there is food there.
Once a good catch is detected by a net weighing mechanism, it triggers a GPRS/GSM device attatched to the system and the fisherman gets a call/sms informing him that his catch is ready. Pascal is in the process of developing a by-catch control system which will ensure that his contraption doesn’t cause overfishing.

Kinyanjui Jiko – a fuel efficiency stove in Kenya

In a previous post we told you  about the Kenya Ceramic Jiko, a fuel efficient stove, it’s such a common stove, we all have one at home.   But did you know that it was invented by Maxwell Kinyanjui?

I recently I “discovered” another amazing jua kali fuel efficient stove – I was at a private party enjoying a fantastic barbeque meal with 100 other guests. I stole around to the kitchen where there was no oven, but out back a tiny aluminium stove that was producing enormous amounts of food with an impossibly small amount of charcoal.

I’ve since come across it again at a private ranch where only the cook knew how to operate the thing to bake the most amazing cakes.

Baking Breadin Baringo
Baking Bread in Baringo

And at Roberts Camp 100 miles north on the shores of Lake Baringo where the chef told me that one only used a tiny amount of charcoal, he lets it cool down somewhat and then let the bread bake without opening the oven until done (I guess he can tell from the smell?)

Fuel efficiency stoves
Fuel efficiency stoves

In recent months I’ve noticed these wonderful stoves everywhere, on roadsides and in jua kali markets.  I don’t know why I didn’t see them before. They come in a variety of sizes and openings are offered (two door or top hinged). They go for US $100 for a small oven (big enough to bake 4 loaves), and a little more for the bigger varieties. Great for baking, they provide important business opportunities for communities, and underprivileged groups like the Jacobs Oven making business for women and feeding orphans.

This is another of Maxwell Kinyanjuils inventions and it’s called the Kinyanjui Jiko. Maxwell is a household name in Kenya, founder of Woodlands 2000 Trust, he is associated with plantations, experiments with trees for fuel, furniture and new designs of fuel efficient stoves including the Kenya ceramic jiko!  Because of the deplorable state of our forests, Kenya is well known for efforts in improving fuel efficiency through  stove inmovations – many of which can probably be attributed to Maxwell Kinyanjui.  – the man gets two gold stars from me! I went to see Maxwell at his Kitengela Arborretum near Athi River just outside of Nairobi. He laughed when he heard that I was the proud owener of a clone. Yes, his inventions are sold only in Nakumatt and Uchumi. In good spirit he was pleased that the oven has been replicated with some modifications … all good business for the jua kali sector.

I bought one and was just amazed that this stove uses such a ridiculously small amount of charcoal. It is great for baking and slow cooking of vegetables and meat but not so good for traditional nyama choma. A well known Nairobi chef told me that he uses it to perfectly finish meat that has been braised on the traditional bbq. As a food loving vegetarian, I find it is brilliant for slow cooked vegetables –mixture of onions, garlic, potatoes, pumpkin, beetroot, aubergines, chopped on a tray and sprinkled with some salt, rosemary or other herbs, and olive oil  …absolutely spectacular results at a very low cost. Bread and cakes have so far eluded me.

Want one? Order it here

Musaki Enterprises Ltd.
Po Box 23058, Nairobi
Lower Kabete
000804
Phone: 0724690352 or 0713564768
Email: teddykinyanjui@hotmail.com or musakitrade@yahoo.com