Bil of Dronebot Workshop. Probably the best teacher of arduino related things. Here is the preview link to the esp32 sleep video. LINK and yes he is on here somewhere.
None at all?
'ang on! crunch No it's not!
I have no idea what you are getting at. I am just looking at a video from DBWS and telling you what I see. I just again reviewed the video looking for the specific spot where he mentions that (paraphrase) since the LED is always on the current readings are artificially high. This is the LED in question.
That would produce a false reading I think.
Consider that the esp32 is a 3.3VDC chip and your USB supply is 5V.
Allow me some accuracy latitude in order to create a quick explanation.
If the chip is using 25 uA at 3.3VDC and you measure the USB VIN line, ignoring losses, you will read (.000025*3.3) / (5) which is 16.5 uA.
Forgetting some small losses, power in and out of the voltage regulator is equal so the current you measure on the USB line will be 3.3/5 times smaller than at the chip.
To clarify, the "vague" suggestion was 'you could use an / the RTC'. Nothing more specific than that. Thanks for the code that you offered!
Great suggestion! I will look into the Adafruit option.
Thanks for the suggestion (I am glad I asked for suggestions before starting out...as there are an almost overwhelming number of good ones to consider...)
Just saying that it's a very fine led, you see, but if anything were to happen to it.. some little oopsie.. the board might use less power.
That's all. Send Dinsdale over annnnd problem solved.
The MKRWAN 1310 sounds like a promising option because of the built-in LoRa and RTC; I have not used any of the MKR series so far (largely to avoid straying into another "form factor" with different Shields etc).
An Adafruit module has been suggested....seems do-able
Fond of using the baby-steps methodology:
As I have been using an Uno R4 (non-WiFi), I was considering making that small step to the R4-WiFi and making a version of my new system that will work locally to my house;
After getting the WiFi to run locally, I would then add the LoRa (module), and continue to experiment with that slightly modified arrangement, but of course collecting data using LoRa. If this is a stable system, I would then physically relocate it and test it several kilometres away.
Your comment about the WiFi being power hungry is valid. If the Sketch has no code calling on the WiFi module (as would be the case, once it is removed to a remote location), Would the WiFi component(s) still draw power? Or, Are the WiFi components totally deactivated?
Only if it is an efficient switching regulator. For a linear regulator the difference is dissipated as heat. Switching regulators are not very efficient at low current levels - in many cases they are worse than linear regulators.
Did you not see my caveat? I was simply trying to educate someone re what happens to Voltage and Current, i.e. if power is same and Voltage goes down, then current MUST go up if we IGNORE losses.
Could you add solar power to top up your cells, weather permitting?
Thanks for the vote for the MKRWAN 1310. It is beginning to sound like a very reasonable solution.
Regarding low-power consumption:
- Low power seems like a valid design goal; even if not very strictly necessary for the present project. I will learn valuable insights by keeping low-power-consumption in mind as I move forward.
- The present project, once fully in its "remote location" mode, will need to be within an electric-fence enclosure (i.e., the type used to control livestock movement). The fencing will be powered by a 12-volt gel-cell battery and a solar panel.
- Late yesterday, I purchased a 25-Watt solar-panel-and-controller combo that (very conveniently!) has a USB power-port. The USB power port should be very stable (I will check before committing to its use). Realizing this, the power consumption for the present project will not be an issue, as it can be run from the USB port.
Meditate. Ohm! Ohm!
PS just btw, the Seebeck Effect does allow high current at microvoltages up as thermoelectricity.
a = 10
b = 100
x = a - bWhat is the value of x?
Nice video. It would be interesting how a ESP32-S3 and ESP32-C6 compares to the ESP32 ("classic").
Are the variables signed or unsigned ?