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michka:research:microbial_fuel_cells:brussels7 [2017-09-20 17:02] – michka | michka:research:microbial_fuel_cells:brussels7 [2017-09-20 17:26] – michka | ||
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====Paul, July 15th==== | ====Paul, July 15th==== | ||
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* Paul made some clay prototyping and cooking in Claire’s oven in the summer, testing a container design for our V&A DIY microbial fuel cells. | * Paul made some clay prototyping and cooking in Claire’s oven in the summer, testing a container design for our V&A DIY microbial fuel cells. | ||
* He will try to make a series in Cardiff University’s ceramic workshop over the summer. | * He will try to make a series in Cardiff University’s ceramic workshop over the summer. | ||
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+ | {{> | ||
====Paul, July 31st==== | ====Paul, July 31st==== | ||
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* Paul wrote a first version of our contribution to the V&A Digital Design Weekend documentation. | * Paul wrote a first version of our contribution to the V&A Digital Design Weekend documentation. | ||
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+ | {{> | ||
====Michka, September 3rd==== | ====Michka, September 3rd==== | ||
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* Testing stainless-steel-scrubbers electrodes - which at least partially worked | * Testing stainless-steel-scrubbers electrodes - which at least partially worked | ||
* Designing & prototyping the robotic system design | * Designing & prototyping the robotic system design | ||
- | https:// | + | {{>http:// |
* The current structure is made of two BBC microbit modules which communicate, | * The current structure is made of two BBC microbit modules which communicate, | ||
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- | ====Paul, September 14th==== | + | ====Michka, September |
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- | * Paul filled up the 13 batteries a few days ago. | + | |
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- | * This morning : | + | |
- | * Two of them do not work. | + | |
- | * One has a voltage of 0.13 V. | + | |
- | * The others have a voltage between 0.55 and 0.76 V. | + | |
- | {{> | + | |
- | * When combining all in series, Paul measures 5.7 V, which allows to run the BBC microbit displaying text during 1 to 2 minutes ! | + | |
- | Video : powerOfTheMudShortEdit | + | |
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- | ///////////////////////////////////////////////////////////////////////////////// | + | |
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- | ====Paul, September 16th==== | + | |
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- | Ici updates: j’ai finalisé le petit robot sur rails, il est légèrement moins trash. Le conteneur en céramique pour l’autre robot est prêt, sorti du four cet après-midi. | + | |
- | J’ai un supercap de 10F en charge sur 12 batteries, il est monté à 1.8V en 6 heures, mais ne gagne maintenant que 1mV/3mn à peu près. | + | |
- | J’ai branché le robot (moteur + led + microbit) directement sur les piles, rien ne se passe. Le robot consomme environ 100mA à 2V sur alimentation secteur. Le microbit tout seul fonctionne 1mn environ avec texte sur les leds dans la même configuration. | + | |
- | Food for thought et experimentations… | + | |
- | Bises et bon weekend à toi aussi! | + | |
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- | ====Paul, September 18th==== | + | |
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- | Un petit dernier update du weekend: | + | |
- | Le supercap de 10F a atteint 2.690 V à 22h30, soit 23 heures après être mis en charge avec un voltage de départ de 0.35V aux bornes du supercap, 5.9V aux batteries. La charge a fait tourner le robot 7mn (microbit avec leds, moteur, led). | + | |
- | Le microbit s’est arrêté à 1.667V. J’ai remis le supercap en charge, je suis curieux de voir combien de temps il prend pour revenir à 2.7v. | + | |
- | Demain j’essaierai avec un 0.22F, que j’ai à l’atelier, | + | |
- | Pour DDW je pense préparer un système manuel en plus du circuit, un simple switch qui permet de passer de charge à décharge, avec des terminaux pour brancher un voltmètre. | + | |
- | Ce matin 2.5V. | + | |
- | Bonne chance avec EDF! | + | |
- | Bises, à demain :>)) | + | |
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- | ====Michka, September==== | + | |
===Tests with resistor-based voltage divider=== | ===Tests with resistor-based voltage divider=== | ||
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* However, I kept having funny results. I tested many of the components, and finally concluded with a test without the voltage divider that it might be perturbing the correct working of the circuit. | * However, I kept having funny results. I tested many of the components, and finally concluded with a test without the voltage divider that it might be perturbing the correct working of the circuit. | ||
* I will therefore not present here the hectic results of these first tests. | * I will therefore not present here the hectic results of these first tests. | ||
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+ | ====Michka, September 14th==== | ||
===Tests directly powered by the power supply=== | ===Tests directly powered by the power supply=== | ||
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* We could also try out what happens when we change the 1381E to 1381J. | * We could also try out what happens when we change the 1381E to 1381J. | ||
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+ | ====Paul, September 14th==== | ||
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+ | * Paul filled up the 13 batteries a few days ago. | ||
+ | {{> | ||
+ | {{> | ||
+ | * This morning : | ||
+ | * Two of them do not work. | ||
+ | * One has a voltage of 0.13 V. | ||
+ | * The others have a voltage between 0.55 and 0.76 V. | ||
+ | {{> | ||
+ | * When combining all in series, Paul measures 5.7 V, which allows to run the BBC microbit displaying text during 1 to 2 minutes ! | ||
+ | Video : powerOfTheMudShortEdit | ||
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+ | ====Michka, September 15th==== | ||
==Test #10 - Changing the transistors== | ==Test #10 - Changing the transistors== | ||
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* We therefore cannot hope that the BBC microbit will open the gate of the second transistor controlling the line powering itself, as the gate voltage will always be a little bit lower than the emitter voltage in this version of a two-transistors circuit. | * We therefore cannot hope that the BBC microbit will open the gate of the second transistor controlling the line powering itself, as the gate voltage will always be a little bit lower than the emitter voltage in this version of a two-transistors circuit. | ||
* Conclusion : using the digital output of the BBC microbit does not improve the autonomy of the BBC microbit. | * Conclusion : using the digital output of the BBC microbit does not improve the autonomy of the BBC microbit. | ||
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+ | ====Michka, September 16th==== | ||
==Test #13 - Changing the supercapacitors== | ==Test #13 - Changing the supercapacitors== | ||
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* The BBC microbit seems to light up when the voltmeter shows 2.67 V on the + pin of the power supply. | * The BBC microbit seems to light up when the voltmeter shows 2.67 V on the + pin of the power supply. | ||
- | ==Test #17 - Test autonomy while running a motor on BBC microbit== | + | ====Paul, September 16th==== |
- | Experiment still to be performed. | + | * Paul finalized the rail-based robot. |
+ | * Paul finalized the ceramic container for the second robot, which ended its oven cooking over the afternoon. | ||
+ | * Paul plugged a 10 F supercap on the 12 working clay MFCs. | ||
+ | * It charged up to 1.8 V in 6 hours. | ||
+ | * Afterwards, it only charged 1 mV every 3 minutes. | ||
+ | * When plugging directly our first robot on the batteries, nothing happens. | ||
+ | * When connected to the power supply, the robot consumes about 100 mA at 2 V. | ||
+ | * Microbit alone displays text for about one minute in the same configuration. | ||
- | ==Test #18 - Try again the two-transistors topology with parallel two-supercaps charge== | + | ====Paul, September 18th==== |
- | Experiment | + | * The 10 F supercap plugged on the batteries reached 2.690 V 23 hours after being put to charge. It had an initial voltage before charge of 0.35 V, when the batteries without any load where giving 5.9 V. |
+ | * This 10 F charge made the first V&A robot run for seven minutes. | ||
+ | * When the robot stopped, the 10 F supercap was still giving 1.667 V. | ||
+ | * Paul wants to try to replace the 10 F supercap for a 0.22 F supercap, which would allow 12 seconds operation for 40 times less charging time. | ||
+ | * Paul is also preparing : | ||
+ | * a manual charging system for the V&A installation for demonstration purposes | ||
+ | * a simple switch which will allow us to control ourself the charge/ | ||
- | ==Test #19 - Testing again the two-transistor Solarbot design== | + | ====Possible future tests==== |
- | Experiment still to be performed. | + | * Test autonomy while running a motor on BBC microbit |
+ | * Try again the two-transistors topology with parallel two-supercaps charge | ||
+ | * Testing again the two-transistor Solarbot design |