Post by backyardhops on May 19, 2020 6:45:58 GMT -8
I want to modify the Smart Garden System to control a 12v water solenoid instead of the pump. The SGS has a USB port to run the pump. I want to attach to the Solenoid/relay instead. Solenoid is 12 Volts while the pump is 5Volts.
Post by backyardhops on May 24, 2020 19:54:17 GMT -8
Greetings BP! The bad news is we are at least six months away from a hops harvest. The good news is we have 6 months to really mess things up!
Speaking of which here is my progress: charlesdarwall.com/images/solenoid.png It is lovely looking but now I have to plug it into the USB. Arrrrgh! I shall assume the Solenoid positive (red) goes directly to the 12V power source. But the ground. I need to get the power 12 ground through the USB device, without making Raspberry crumble ... Hmmm...That is the great mystery.
You switch your 12V Powersupply through the relay. You control the relay with 5V from the USB connector. Otherwise you can program another GPIO from the Pi2Grover board (Pi2Grover supplies 5V GPIO signals - directly from the Pi they are 3.3V).
Post by backyardhops on May 31, 2020 11:15:46 GMT -8
EUREKA!!!! It works, at least it does when I press the "Water" button on the Blynk. What comes out resembles the experience of an old man with an enlarged prostrate (tinkle) while what I need is Secretariat after winning the Kentucky Derby. I'll tinkle with the code (pardon the typo)