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michka:research:microbial_fuel_cells:brussels7 [2017-09-17 09:41] – michka | michka:research:microbial_fuel_cells:brussels7 [2017-09-20 17:28] – michka | ||
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====Abstract==== | ====Abstract==== | ||
+ | |||
+ | To be updated | ||
* I connected and tested the last version of our Power Harnessing System (PHS) circuit of [[michka: | * I connected and tested the last version of our Power Harnessing System (PHS) circuit of [[michka: | ||
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====Paul, July 15th==== | ====Paul, July 15th==== | ||
- | J’ai fait un peu de poterie quand on était chez Claire, plusieurs prototypes de pots pour batterie, image en pièce jointe. Je vais surement en fabriquer une série (15-20) dans le département céramique de l’Université cet été, c’est en cours de négociation. | + | * 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. | ||
- | Image | + | {{> |
- | Proto-pots-Claire | + | |
====Paul, July 31st==== | ====Paul, July 31st==== | ||
- | Publication text | + | * Paul wrote a first version of our contribution to the V&A Digital Design Weekend documentation. |
- | Images | + | {{> |
- | Mudcap | + | |
- | Mudflat | + | |
- | Mudpot | + | |
- | Muddrawing | + | |
====Michka, September 3rd==== | ====Michka, September 3rd==== | ||
- | “J’ai commandé par RS online les deux transistors qui me manquaient, et j'ai assemblé le weekend passé le circuit de gestion énergétique comme tu l' | + | * After some logistical tribulations to get a few missing components, Michka tried (and failed) to replicate the power harnessing system circuit designed during our last working session. |
====Paul, September 3rd==== | ====Paul, September 3rd==== | ||
- | “De mon côté j’ai bossé sur les pots en argiles pour les nouvelles piles, commencé à expérimenter avec des électrodes en stainless steel scrubbers | + | * Paul worked on: |
- | + | * Making the new clay pots series for the V&A MFCs. | |
- | Image : | + | {{> |
- | new_robot_design | + | {{> |
- | piles_vides | + | * The clay pots had to cook over 36 hours, the temperature gradually rising to 1200 °C. This high temperature allows for waterproofing of the pots without the use of glaze or additional treatments. |
- | main_module | + | * Testing |
+ | * Over the long term, they seem to work as well as the test battery with graphite felt electrodes. | ||
+ | * Designing & prototyping the robotic system design | ||
+ | {{>http:// | ||
+ | * The current structure is made of two BBC microbit modules which communicate, | ||
====Paul, September 5th==== | ====Paul, September 5th==== | ||
- | “Un article sur shewanella génétiquement modifiée pour améliorer le rendement” | + | * Paul sent Michka [[https:// |
- | https:// | + | |
====Paul, September 7th==== | ====Paul, September 7th==== | ||
- | Ça roule à 1.9v ! (esthétique proto) | + | * Paul made a quick prototype of the horizontally-moving part of the robot, which runs at 1.9 V. |
+ | {{> | ||
- | Images : | + | ====Michka, September |
- | MudBotCar.jpg | + | |
- | + | ||
- | ====Paul, September 14th==== | + | |
- | + | ||
- | Images | + | |
- | Piles | + | |
- | Piles ensemble | + | |
- | + | ||
- | ====Paul, September 14th==== | + | |
- | + | ||
- | Testé les 13 piles ce matin, 2 ne marchent pas, une a un voltage de 0.13V, les autres entre .55 et .76V | + | |
- | En série ça nous donne (au repos) 5.7V. | + | |
- | Ca fait tourner un microbit avec texte défilant pendant 1 à 2 minutes, plutôt cool!!! | + | |
- | Je suis en route pour l’atelier, | + | |
- | + | ||
- | Images : | + | |
- | 0.572VTopVIew | + | |
- | powerOfTheMudShortEdit | + | |
- | + | ||
- | ====Paul, September 16th==== | + | |
- | + | ||
- | 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! | + | |
- | + | ||
- | ====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. | ||
+ | |||
+ | ====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. | ||
+ | |||
+ | ====Paul, September 14th==== | ||
+ | |||
+ | * 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 | ||
+ | |||
+ | ====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. | ||
+ | |||
+ | ====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 |