I need to power my Core(v1.0) via the PINs. According to the PINOUT diagram I can connect 3,6V up to 6V to the VIN PIN. I have an 8,7V DC power source available where the Core should get into place. So I decided to lower the voltage with a step-down-converter (datasheet).
I set it to 5V on the output side and connected VIN and GND. But this doesn’t work, I’m ending up with a slow blinking red RGB LED. A look at the documentation tells me “Flashing yellow/red: Bad credentials for the Spark Cloud. Contact the Spark team (firstname.lastname@example.org).” I don´t think this is the problem. Tests with the USB connection work just fine. What do you think is the problem?
I am confused right now, because VIN for me means variable input - but I also used it to run my i2c LCD that needs more than 3,3V. So VIN can also be VOUT?
Basically I thought I have to do something like @peekay123 did in this thread.