Pinch valve: Gear motor rotates lead screw, moving nut (and attached slide gate) up and down. Lowering the gate pinches 1″ I.D. Silicone rubber tubing shut. Raising it, opens the valve. The L298N H-bridge motor controller provides a simple inexpensive … Continue reading
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Motorized Pinch Valve Some ideas for a motorized pinch valve using a geared stepper motor controlled by an arduino (for example. or PLR? or raspberry pi?). Need to design and print mounting brackets, gearing mechanism, linear actuator, etc. Design parts … Continue reading
Some ideas for a motorized pinch valve using a geared stepper motor controlled by an arduino. Need to design and print mounting brackets, gearing mechanism, linear actuator, etc. Design parts in (e.g.) Autodesk fusion 360, print on 3D printer. One … Continue reading
A good article from HomePower: Lithium-Ion Batteries for Off-Grid Systems Are They a Good Match? By: Randy Richmond Issue Date Dec 16, 2012 For decades, lead-acid battery technology has been the mainstay of battery-based renewable energy systems, providing reliable storage … Continue reading
Problem # 1: Let’s say we have a river able to generate 100 kW. In a 24 hour period, it produces 100 * 24 = 2,400 kWh. Let’s also say that we have a total daily demand of 2,400 KWH, … Continue reading
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The farm is located near Costanera km 171. Owner is Tom Nigel. The stream appears to be smaller than SGEV Rio Aguila, but higher head is available – about 100 M vs 50 at SGEV. The upper 55 meters is … Continue reading
An interesting very simple home batch digester design from Open Source Biotecture in Nepal: (One question: why is the truck inner tube in a barrel with water? What happens to the water when the bag fills and empties?
LED Lighting: Getting It Right Avoiding common misconceptions about LED sources and fixtures Myth #1: LEDs last forever Myth #2: LEDs are not bright enough Myth #3: White-light LED sources produce over 160 lumens per watt Myth #4: Three-watt LEDs … Continue reading
Site info: Total property is 94 hectares (234 acres). It is saddle shaped, with river & valley running West to East across the middle, rising to ridges at north and south. Highest elevation at South ridge is 980 M. River … Continue reading