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| michka:research:microbial_fuel_cells:cardiff6 [2017-09-17 14:34] – michka | michka:research:microbial_fuel_cells:cardiff6 [2017-09-17 14:36] – michka | ||
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| ==2.5.1 Overnight parallel post-chip supercap charge== | ==2.5.1 Overnight parallel post-chip supercap charge== | ||
| - | **Results** | + | //Results// |
| * We connected our three (inequally) working Mudwatts in parallel to a 0.22 F 2.5 V supercap. | * We connected our three (inequally) working Mudwatts in parallel to a 0.22 F 2.5 V supercap. | ||
| Line 257: | Line 257: | ||
| * About one hour after the start of the experiment, it was charged at 0.25 V. | * About one hour after the start of the experiment, it was charged at 0.25 V. | ||
| * After letting it overnight, it was only charged at 1.9 V, and we could not see any charging activity with a typical multimeter. | * After letting it overnight, it was only charged at 1.9 V, and we could not see any charging activity with a typical multimeter. | ||
| - | * We would have expected a charge reaching 2.5 V, which is the maximum rating of the supercap… | + | * We would have expected a charge reaching 2.5 V, which is the maximum rating of the supercap... |
| - | **Consequences on the PHS design** | + | //Consequences on the PHS design// |
| - | | + | |
| * This means that our supercap will only charge up to 1.8 V, which is not sufficient to power the BBC microbit | * This means that our supercap will only charge up to 1.8 V, which is not sufficient to power the BBC microbit | ||
| * This means that we need another boost converter or charge pump using the 1.8 V charged supercap energy to bring it up to 2.4 V to activate the 1381 voltage detector, and then power the BBC microbit enough to open the gate of the 2N3904 feeding itself longer directly from the energy source. | * This means that we need another boost converter or charge pump using the 1.8 V charged supercap energy to bring it up to 2.4 V to activate the 1381 voltage detector, and then power the BBC microbit enough to open the gate of the 2N3904 feeding itself longer directly from the energy source. | ||
michka