One PCB many uses:
Starting from http://www.xs4all.nl/~sbolt/e-groeneVinger.html Solar powered "green thumb" monitors plant water level. Can we place a larger load on the "dry" LED output so that a significant increase in current is required when it flashes, thereby dropping the supply voltage and signaling the condition of the soil back to a master unit which is supplying power and ground on a two lead cable? The power supply would run through a resistor so that the voltage would drop as the load increased. The master unit would need a resistor divider and would then use the A2D to monitor the relative voltage supplied, or a circuit that triggers an input when the supply drops below a preset voltage could be used. Ala: aout
Add a sprinkler controller solenoid driver chip, and a jacks to use other units as moisture sensors.
Needs a good relay driver to operate a sprinkler valve. Orbit Model 57460 ($10.46 from Home Depot) which is rated 24VAC requires 5.2VDC (166mA) to pull in and holds to 0.5VDC (20mA). At 3V, 100mA. 32 Ohm Coil. A standard Lawn Genie 54000 valve pulls 0.4A at 24VAC to open and 0.2A to hold.
Solar Panels: Must have battery to manage high current requirements for sprinkler valve. Will charge keep up with use? Need a large panel...
Use servo (with power cut via FET when not moving) to open / close a valve instead. Could leave /partially/ open and just adjust slightly more or less open.
|file: /Techref/idea/ag.htm, 4KB, , updated: 2015/9/24 12:23, local time: 2019/4/26 04:23,
|©2019 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://techref.massmind.org/techref/idea/ag.htm"> Solar Powered Automatic Garden Watering System Idea</A>
|Did you find what you needed?|
Welcome to massmind.org!
Welcome to techref.massmind.org!