How much power does it produce? It must be pretty bad since they don't mention it anywhere in the article.
this post was submitted on 04 Feb 2024
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They claim "68 times more than required to operate the sensors", then mention a sensor to measure soil moisture.
A basic soil moisture sensor, like say, the ones I have stacked on a shelf here, will work on 2 AA batteries. It runs on 2V at 10mA. So that's 20 milliWatts, and in willing to be a fair bit of that goes into the electronics that make a red, green or orange led light up at certain moisture levels, and the bit that beeps when below a certain level.
Still, this sets something of an upper limit at 1.3W, or maybe 680 mA? Those seem rather high, so I'm betting their moisture sensor is a bit more delicate than my model. It depends on the size and number of cells though.
Im pretty sure most soil moisture measurment devices just measure the capacitance to measure dielectric permittivity. U can design such a setup to use any arbitrary amount of power depending how close the electrodes are rogether etc etc.
Yeah, I am imagining the soil moisture things from the garden store, with the little needle gauge thing, that takes so little power that there's no battery slot. I feel like the amount of power this thing makes is extremely low.
Probably generates nanowatts
The linked article has a table that gives 1.74 uW/cm^2. However glancing over the rest of the paper there's a ton of variability of output.
I'm thinking around 6
Damn I hoped it would go to eleven, I need that little bit extra.
For low power applications. You won't be charging your phone off this.
Depends on how many fuel cells you get and are able to shovel dirt into
1.21 gigawatts
Love these pie in the sky articles that get debunked immediately in the comments
Who debunked this? I don't any comments debunking it.
Also if you read the article it has limited applications so it's not some pie in the sky you think it.
I kind of get op's point. It's not straight up debunked, but it's so few microwatts that they can power the sensor but they can't store log data.
It requires a close proximity powered base station nearby to fire a signal out to get reflected back somehow.
I'm having a hard time picturing any viable setup outside of a laboratory experiment. If you've got a powered base station within a few inches of it why not just power it with that?
" As long as there is organic carbon in the soil for the microbes to break down, the fuel cell can potentially last forever.”
It's also a stationary battery
"Although the entire device is buried, the vertical design ensures that the top end is flush with the ground’s surface."
Better link with fewer ads: https://interestingengineering.com/innovation/new-fuel-cell-taps-energy-from-dirt-dwelling-microbes-to-power-sensors
Link to paper https://dl.acm.org/doi/pdf/10.1145/3631410
So if the tip is sticking out for airflow, how does it handle a flash flood?
"Furthermore, the researchers used waterproofing material on the cathode's surface, allowing it to work during flooding and assuring progressive drying after submersion."
I missed that part in the article, I should have just searched for the word flood, woops
Sensuously?