Hi I’m building a project around the seeeduino stalker v2.0, and I’m having trouble getting it to work.
The project is a pretty simple 6 LED, 2 photoresistor, 2 photodiode setup that alternates which LEDs are on while reading each input in turn and writing to the sd card.
Everything works while it is plugged in via USB (FTDI cable), but when I switch to battery (12V 2400mAh Nicad through a L7805CV regulator to the solar input terminal), the program continually resets at or just after reading the sd card.
I’ve put an ammeter in and get about 24mA draw during the startup.
The red CH led has a very faint flicker to it when on battery power that is not present on USB.
I read 5V at the output of the 7805 on battery power, but 0V at the USB5V output of the arduino. When on USB power I read 5V at the USB5V.
I read 2.5V on my +5V rail of my project board on battery power, but 5V on USB power.
Also having no luck with the RTC, but that’s a separate issue.
Any help or thoughts is much appreciated.