USB cable on the Wipy to Vin and GND
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Can I simply connect a USB cable on the Wipy to Vin and GND without anything happening?
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@Wolli01 Something should happen: the device will run. Standard USB has 5V, Vin is fine for up to 5.5V. But: unless negotiated differently, USB may not deliver more than 100mA, which is not sufficient for the ESP32 peak current of ~300 mA. Anyhow you can try.
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@robert-hh Thank You!
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@robert-hh
I want to thank you again for all your answers!
My project so far runs without any problems over the USB cable.
But if I only want to connect a 3 Volt battery, do I connect it directly to the 3.3 Volt pin on the Wify? -
@Wolli01 The 3.3V pin is the output of the regulator, not an input. Connecting a power supply there will damage the device. Vin takes also lower voltages than 5V. When Vin is lower 3.4V, the regulator switches to bypass mode. The ESP32 itself should work fine down to 2.3 V, but the flash chips may fail earlier.
What kind of battery are you considering? It must be able to supply current peaks up to 250 mA. -
@robert-hh
I would like to try these batteries because they also run on an Andruino board under Lorawan sometimes up to 5 years.
https://www.amazon.de/VARTA-PROFESSIONAL-CR123A-2er-Bli-Blau-Silber/dp/B000EGWOEU/ref=sr_1_3?__mk_de_DE=ÅMÅŽÕÑ&crid=3AFPQO7UJTMK7&keywords=cr123a&qid=1555839617&s=gateway&sprefix=cr1%2Caps%2C158&sr=8-3Why do Wipy and Lopy run so badly in the battery area?
With Lorawan and 2700 mah LiPO battery I can only send about 10-14 days at every minute.
Often something is written about years. Is that only possible with Andruino?Translated with www.DeepL.com/Translator
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@Wolli01 These batteries are only good for medium to low power consumption. They are rated at ~1500 mAh, but only at 100Ohm load = 30mA. My first impression is, that these batteries are too weak. Anyhow, Better go for batteries with a higher voltage like this one: https://www.conrad.de/de/p/saft-ls-14500-spezial-batterie-mignon-aa-lithium-3-6-v-2600-mah-1-st-651153.html, or use three AA sized cells with 1.5 V each.
If you scan through the forum you'll find a lot of discussion about power consumption and power budget. The power consumption of the ESP32 is pretty high by itself, and the WiPy need comparable long to start, consuming high power during that period. Other Pycom devices need more power and longer start-up time.
The baseline Arduino UNO with its 8 bit Atmel processor at 8 MHz takes ~5 mA at full speed, compared to ~30mA for the ES32 w/o WiFi and up to 250mA peak/100mAaverage with wifi, @160 MHz clock speed.
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