The relay will be in the open position, from having been opened by the arduino due to the battery voltage being low. The user then charges the battery, and turns the device back on using the external switch. The arduino doesn't receive power as the relay is still in the open position.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16