ESP8266 Community Forum

- Fri Mar 30, 2018 4:24 pm #75021 I got a reply from Maxim, so I'll avoid the MOSFET : it's harmless to be underpowered for the 18B20 as well

So the schema is here : https://github.com/destroyedlolo/ESP8266/blob/master/SondePiscine/extras/Schema.png

• D1 and D2 limit the power supply to a bit more of 3v
• I duno yet if I will put solar cells in parallel or in series : they are coming from cheap (and dead) garden solar LED and I duno which voltage they're providing (too cloudy today to check). If a cell can reach more than 3v in case of light cloudy weather, I'll put them in parallel for a better amperage.
• I got 2 capacitors of 2200 uF from a dead ATX PSU.
• D3 prevent the ESP to start before capacitors are loaded enough.

Now, waiting for the rain to stop to test in situe

- Sat Mar 31, 2018 3:06 am #75029 I doubt that this will work in real life. esp8266 is picky on risetime of supply voltage and IRC there was allready a thread where sb failed on a similar approach. With the flat ramp that results from such circuit with solarcells the esp just hangs and draws high amounts of current...

- Sat Mar 31, 2018 5:37 pm #75043 DS18B20 is wired wrong. Misconnected Vcc. I think you would be better off using a mosfet and Zener to stay away from the "slow rise"

- Sun Apr 01, 2018 3:34 pm #75063 You're right and it's corrected.

I think you would be better off using a mosfet and Zener to stay away from the "slow rise"

Any schema for that ?