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--- michka:research:microbial_fuel_cells:brussels7 [2017-09-20 17:43] – michka
+++ michka:research:microbial_fuel_cells:brussels7 [2017-09-20 17:54] (current) – michka
@@ Line 5: / Line 5: @@
 ====Abstract====
-To be updated
+   * Paul prototyped and made a series of clay pots to host our MFCs.
+   * Paul designed the final version of the robots, and built the first one.
-   * I connected and tested the last version of our Power Harnessing System (PHS) circuit of [[michka:research:microbial_fuel_cells:cardiff6|our last working session in Cardiff]].
+   * Paul started up the MFCs, and performed power tests.
-   * We saw that the energy bursts provided by the one-transistor version of the PHS circuit to the BBC microbit were quite short because of a mismatch between the nominal charge voltage of the supercap (2.7 V), the minimal power supply voltage of the BBC microbit (1.7 V), and the voltage drop across the circuit (about 1 V).
+   * Paul wrote our contribution to the V&A Digital Design weekend publication.
-   * The duration of the BBC microbit activity bursts seems to increase linearily as the capacity of the supercaps increase.
+   * Michka performed tests on the Power Harnessing System (PHS) circuit.
-   * We also observed that the two-transistor version of the PHS circuit in which the second transistor is activated by the BBC microbit itself does not seem to work, and probably never will, because it seems that the output voltage provided by the BBC microbit cannot be higher than the voltage it is supplied with.
+     * The best circuit we got so far is the following one :
+       * the + pin of the power supply is connected to the + pin of the supercapacitor.
+       * the + pin of the supercapacitor is connected to the + input pin of the 1381E.
+       * the - pin of the supercapacitor is conneced to the ground of the power supply.
+       * the - input pin of the 1381E is connected to the ground of the power supply.
+       * the output pin of the 1381E is connected to the gate of a KSD5041QTA transistor.
+       * the collector of the transistor is connected to the
+       * the emitter of the transistor is connected to the 3V pin of the BBC microbit.
+       * the ground pin of the BBC microbit is connected to the ground of the power supply.
+     * With two 2.8 V 10F supercaps in parallel, we obtain a 56 seconds run of the blinking BBC microbit.
 ====Paul, July 15th====