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Jasper Sikken

@jrsikken.bsky.social

120 followers 160 following 390 posts

🇳🇱🇪🇺Father, husband, electronics engineer, runner. I love low power and solar energy harvesting circuits. I share my failures too. Concerned about climate. From Amersfoort, the Netherlands. http://paypal.me/jrsikken

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Jasper Sikken @jrsikken.bsky.social · 21h

PCB looks awesome. I stopped messing with stencils for few PCBs, I just manually apply solder to the pads, then place components while heating with hot air gun.

Jasper Sikken @jrsikken.bsky.social · 23h

Daarmee

Jasper Sikken @jrsikken.bsky.social · 1d

*ontkrachten

Jasper Sikken @jrsikken.bsky.social · 1d

Ik heb vandaag iets wat chatGPT beweerde met een experiment moeten ontkrachtigen. Dat als je twee magneten met dezelfde polen tegen elkaar legt, dat die magneet universeel wordt, dat elke zijde zowel aangetrokken wordt door de zuid als noordpool. Mensen, je moet zelf denken!

Jasper Sikken @jrsikken.bsky.social · 1d

Ik heb me opgegeven voor 3 halve marathons. 20 December de Wintermarathon in Leeuwarden, 28 maart de Drents Friese Woldloop in Diever en 11 April de Halve van Nijkerk. Wie doet mee?

Jasper Sikken @jrsikken.bsky.social · 1d

Ik heb me opgegeven voor 3 halve marathons. 20 December de Wintermarathon in Leeuwarden, 28 maart de Drents Friese Woldloop in Diever en 11 April de Halve van Nijkerk. Wie doet mee?

Jasper Sikken @jrsikken.bsky.social · 3d

I think I know the problem. Out is not a rail to rail PWM. It is actually a 18mA constant current sink and the voltage at the output is 5V minus the LED forward voltage at 18mA. It uses PWM to reduce the average current down to 0A. So the PWM voltage swings between 2V and 3V.

Reposted by Jasper Sikken

Sander van de Bor - California STEAM @californiasteam.bsky.social · Dec 22

Lithium-ion capacitors (LICs) are a special kind of supercapacitor. Typically, they have a voltage limit of 3.8V, but recently, I discovered a new type that can handle up to 4.2V! This voltage increase can significantly boost their energy storage capacity by tripling it.

Showing two LIC capacitors. The blue version is a 3.8V 40F capacitor and the purple version is a new 4.2V 90F capacitor. This purple capacitor is only 5mm longer but contains 3x more capacity.

Reposted by Jasper Sikken

Jasper Sikken @jrsikken.bsky.social · Dec 3

There is a blog post on Hackaday about a guy who uses a Lithium Ion Capacitor and efficiently charges it from a solar panel, a linear voltage regulator and a schottky diode.

Building Experience And Circuits For Lithium Capacitors

For the cautious, a good piece of advice is to always wait to buy a new product until after the first model year, whether its cars or consumer electronics or any other major purchase. This gives th…

Jasper Sikken @jrsikken.bsky.social · 4d

At work we use hand desinfectant as whiteboard cleaner, works great

Jasper Sikken @jrsikken.bsky.social · 4d

If big tech controls intelligence of AI models people use, it basically controls the power of people. We should heavily invest in our own AI and not in others AI.

Jasper Sikken @jrsikken.bsky.social · 4d

This boards efficiently harvests indoor light energy and stores it in a lithium ion capacitor.
www.tindie.com/products/jas...

Solar harvesting into Lithium Ion Capacitor by Jasper Sikken on Tindie

A highly efficient solar powered Li-Ion Capacitor charger

Jasper Sikken @jrsikken.bsky.social · 4d

Whenever I interact with Google Gemini I think I am talking to a highly trained but very drunk student.

Jasper Sikken @jrsikken.bsky.social · 4d

The WS2811 is not working as expected. It is not simply a PWM controlled open drain output. I think it expects a real LED with a forward voltage for the constant current circuit to work properly. It probably meana a few evenings of experimenting.

Jasper Sikken @jrsikken.bsky.social · 6d

Stel je eens voor dat je een vegaburger koopt terwijl je dacht vlees te kopen, dat wil de vleesindustrie nou voorkomen. Dan zou pindakaas ook niet van de zuivelindustrie mogen. Opnieuw stemt het Europees Parlement erover - nos.nl/l/2585627

Jørgen Eriksson

Jasper Sikken @jrsikken.bsky.social · 6d

Ik zie nog net een vermeer maar achter witte diagonale lijnen. Is het een optische ilusie? Ik snap het niet.

Jasper Sikken @jrsikken.bsky.social · 7d

I have acquired Arduino. I have a bunch of them in a box.

a arduino board is connected to a usb cable

ALT: a arduino board is connected to a usb cable

media.tenor.com

Jasper Sikken @jrsikken.bsky.social · 9d

Yesterday I designed an ordered the PCB and components.

Jasper Sikken @jrsikken.bsky.social · 9d

Ik zag hem zojuist

Jasper Sikken @jrsikken.bsky.social · 9d

Great idea. Looks awesome, do you have a photo of the PCB on the motor?

Jasper Sikken @jrsikken.bsky.social · 9d

My supply is 5V and my motor 3V, can I just PWM the 5V supply down to 3V average, or does it need a voltage regulator?

Jasper Sikken @jrsikken.bsky.social · 10d

Does it work well? I am working on a similar circuit to drive vibration motors. It uses mosfets to drive and brake the motor. I wonder if you considered such a circuit to. Why have to chosen for DRV8251?

Jasper Sikken @jrsikken.bsky.social · 10d

AEMLION is a tiny solar energy harvesting board with integrated 3.3V regulator. It is able to harvest the tiniest amount of light energy and store it in to a li-ion battery, It works great for low power wireless sensor projects
hackaday.io/project/1603...

Solar harvesting into Li-ion battery

The AEMLION is a 0.8x0.6 inch board for the AEM10941 Solar Harvesting IC from E-peas. It efficiently converts solar panel energy into Li-ion battery charge, it even works with indoor light. It…

Jasper Sikken @jrsikken.bsky.social · 10d

Got the idea of driving small vibration motors in a long string using WS2811 LED drivers. It is EMI robust because the signal is push-pull and regenerated at each node. The motor is driven using a PWM controlled mosfet. Another mosfet brakes the motor.

Jasper Sikken @jrsikken.bsky.social · 11d

Te gekke foto