If your Dallas DS18B20 was purchased on ebay or amazon or elsewhere other than DigiKey, Mouser, etc, it is likely counterfeit and will not work in parasitic power mode and will give a -127.
Here's a sketch to help determine of the Ds18B20 is genuine and rule-out shoddy counterfeits:
https://github.com/cpetrich/counterfeit_DS18B20
I wasted countless days and days with remote sensors only to find they were counterfeit.
If your Dallas DS18B20 was purchased on ebay or amazon or elsewhere other than DigiKey, Mouser, etc, it is likely counterfeit and will not work in parasitic power mode and will give a -127.
Here's a sketch to help determine of the Ds18B20 is genuine and rule-out shoddy counterfeits:
https://github.com/cpetrich/counterfeit_DS18B20
I wasted countless days and days with remote sensors only to find they were counterfeit.
@rpunkt if 3ma is your current draw while sleeping, you will quickly drain any battery or supercap. The "mini boost buck dc board" itself has a no-load current of 1.77mA.
Might look here for low-power libraries and design considerations:
@sergio-ramos Did you have an issue with one? I have purchased many of them and have not had one problem.
Thanks, I'll check out that library as well.
After four days of operating on a 18650 battery, the battery voltage hasn't dropped from full charge voltage of 4.12v. I was quite pleased with the nrf24 range of these ElectroDragon boards as well.
I received my order of these nrf24duinos and loaded up a Nodemanger BME280 sketch. Currently running on a battery and waking up every 10 minutes.
I installed the spiflash.h library, added the "SPIFlash flash(8);" but flash.powerDown(); throws the an error during compilation "class SPIFlash has no member named 'powerDown".
I opened the spiflash.h library and no powerDown defined. I did see sleep() though.
I am considering ordering several of these for new and future sensors. I thought I saw this board supported by myscontroller bootloader in 13pre or the github dev branch but cant seem to find it at the moment.
Has anyone tried this FOTA?
--Reichard