Archiv: #Garmin Powermeter: Neue Rally #Pedale für #Rennrad und #MTB https://www.sports-insider.de/garmin-powermeter-neue-rally-pedale-fuer-rennrad-und-mtb-42212/ #Mountainbike #Nabe #Wattmesser #Watt #Leistungsmesser #Leistungsmessung #Powermeter #Kurbel
#PowerMeter
When Your #PowerMeter Becomes a Tool of Mass #Surveillance
Simply using extra #electricity to power some Xmas lights or big fish tank shouldn’t bring the police to your door. In California, the law explicitly protects the #privacy of power customers, prohibiting public utilities from disclosing precise “smart” meter data in most cases.
Despite this, #Sacramento ’s power company & law enforcement agencies have been running an illegal mass surveillance scheme for years
https://www.eff.org/deeplinks/2025/07/when-your-power-meter-becomes-tool-mass-surveillance
On DC and USB Power Meters: Review - Found out how I measure off-grid and portable device consumption to understand and manage and conserve! #powerMeter #frugal - https://www.earth.org.uk/note-on-USB-DC-power-meters-REVIEW.html
In today's evolving energy landscape, simply charging your electric vehicle isn't enough. True efficiency and peace of mind come from intelligent energy management. EV Morocco introduces the Power Meter, an essential accessory designed to be the central intelligence unit for your EV charging solution, providing unparalleled control and optimization over your energy flows.
#EVMorocco #PowerMeter #EnergyManagement #SmartCharging #EVCharging #LoadBalancing #SolarEV…
On Local Bytes Power Monitoring Smart Plug: Review - Learn how I set up and used this device preflashed with Tasmota! #powerMeter #cutCarbon #frugal - https://www.earth.org.uk/note-on-Local-Bytes-Power-Monitoring-Smart-Plug-REVIEW.html
2024 366 photochallenge 10/02
#2024366photochallenge #2024photochallenge #2024photoproject #blackandwhite #blackandwhitephotography #winnipeg #manitoba #powermeter #westend #graffiti
On Plug-in Mains Power Meters for the UK: Review (2008) - Find what's drawing what watts from the comfort of your own armchair, save energy and avoid bill shock! #powerMeter #cutCarbon #frugal - https://www.earth.org.uk/note-on-plug-in-power-meters-for-the-UK-REVIEW.html
Not the best impulse purchase I ever did, seeing that now I am unemployed.
When you pop out for a soft ride, just to say hello to a friend, mostly in the rain as well, and Strava gives you some nice PRs and best Power readings 😁😁 it makes for a good afternoon 👍
#biking #Strava #powermeter #Velo #pr
Because I spend too much time polishing, these are my raw notes for now. If you have questions, please ask and I can clean it up.
Design 1
Using the 0-1 mA meter from Amazon.
Following https://www.allaboutcircuits.com/textbook/direct-current/chpt-8/voltmeter-design/, we can calculate how much voltage will drive the meter to full scale.
$E = I \times R$
$E = .001 A \times 157 \Omega$ (internal resistance)
$E = 0.157 V$
Let’s say the max voltage is what we would get for a 5W signal. Using Eq. 7.1 from “Experimental Methods in RF Design” (EMRD) which accounts for the 0.6V voltage drop across the diode.
$P_{watts} = \frac{(V_{dc} + 0.6)^2}{2 \times R}$
$5 = \frac{(V_{dc} + 0.6)^2}{2 \times 50}$
Wolfram Alpha gives V ≈ 21.761 volts (https://www3.wolframalpha.com/input?i2d=true&i=solve+5+%3D+%5Cfrac%5C%28123%29Power%5B%5C%2840%29V+%2B+0.6%5C%2841%29%2C2%5D%5C%28125%29%5C%28123%29100%5C%28125%29+for+V&lang=en), which checks out when you run it backward.
$5 = \frac{(21.761 + 0.6)^2}{2 \times 50}$
So now we can go back to All About Circuits and figure out the resistor value. I did this in LibreOffice, orange cells are calculated using $E = IR$
Screenshot of a table of values relating E, I, R of the meter movement, multiplier resistor, and the total.
This indicates a 21.6K multiplier resistor.
Looks like I can replicate EMRD with the same equation:
Screenshot of some more E, I, R tables, showing different inputs and outputs.
And of course, here’s the end product I’d like (from All About Circuits), a variation on the two-input meter shown in EMRD Fig. 7.10(B).
Image from All About Circuits, showing a meter schematic with a multi-selection switch leading to different resistors between the test lead and the meter.
Figure 7.10 from Experimental Methods in RF Design, showing a one-meter, one-input schematic and a one-meter, two-input schematic.
Next steps
- The 50 $\Omega$ load needs to take the power, so I think I will have a dummy load port there.
- The diode needs to have a breakdown voltage of (for these 5W max specs) greater than…what?
- [ ] how to determine breakdown voltage and relationship to watts in this circuit.
- According to DigiKey, 1N4152 is obselete but can be replaced with BAS33-TAP (https://www.digikey.com/en/products/detail/vishay-general-semiconductor-diodes-division/BAS33-TAP/16669588).
- Seems important to measure the resistors carefully to increase meter accuracy (don’t just take values for granted)
A wobbly picture of as Stereo VU power meter I designed back in 1982. The circuit did indeed work and continues to work to this day.
#Electronics #LED #VUMeter #PowerMeter
[15/08/2021]
A closeup of the HF Directional Coupler for use with my homebrew digital VSWR and power meter (see previous tweet). I had to use tweezers when winding the coils!
#HamRadio #AmateurRadio #hamr #SWRmeter #PowerMeter
[19/02/2020]
I've restored, repaired and calibrated this neglected Feedback Electronics #WattMeter from the 1980s. It looked like it had been left in someone's back yard for years, though internally as clean as a whistle.
#PowerMeter #TrueRMS #TestGear #TestEquipment #Electronics
[25/01/2020]
On Local Bytes Power Monitoring Smart Plug: Review - Learn how I set up and used this device preflashed with Tasmota! #powerMeter #cutCarbon #frugal - https://m.earth.org.uk/note-on-Local-Bytes-Power-Monitoring-Smart-Plug-REVIEW.html
#biking #ErkenntnisDesTages:
Zone 2 Training fühlt sich _wirklich_ extrem langsam und unterfordernd an. 🤔
Ansonsten: Der neue Powermeter funktioniert wunderbar. Die zweite Test-Tour klappte einwandfrei (nachdem ich die erste gestern aus eigener Unachtsamkeit/Dummheit verkackt hatte).
Bonus Erkenntnis: Geringfügig kürzere Kurbelarme sind anscheinend tatsächlich keine blöde Idee.
#Technik #Training #Powermeter #Power2max #Gravelbike #Fitness #mdRddG
Hallo #BikeBubble,
hat hier jemand Erfahrung mit Power2max #Powermeter?
Idealerweise dem NGeco G-X für #Gravelbike?
#Bike #tech
On Local Bytes Power Monitoring Smart Plug: Review - Learn how I set up and used this device preflashed with Tasmota! #powerMeter #cutCarbon #frugal - https://www.earth.org.uk/note-on-Local-Bytes-Power-Monitoring-Smart-Plug-REVIEW.html
On Local Bytes Power Monitoring Smart Plug: Review - Learn how I set up and used this device preflashed with Tasmota! #powerMeter #cutCarbon #frugal - https://www.earth.org.uk/note-on-Local-Bytes-Power-Monitoring-Smart-Plug-REVIEW.html
„Moderne Messeinrichtung“(sic!) (Zweiwege-Stromzähler).
Infrarotschnittstelle lässt sich per PIN-Eingabe mit‘ner Taschenlampe an einem Lichtsensor aktivieren.
(und/oder wohl in den „verbose-Mode“ bringen - je nach Modell)
Ich weiss gar nicht was ich dazu sagen soll.
PIN kommt vom Betreiber und wird ausschließlich per Briefpost mitgeteilt.
Wegen der Sicherheit.
I can’t even. Echt.
Das wirkt alles so 1995.
Client Info
Server: https://mastodon.social
Version: 2025.07
Repository: https://github.com/cyevgeniy/lmst